<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 24-February-2022 [12:31:21] {AM}-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#CoverPage" roleURI="http://www.magnachip.com/role/CoverPage" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedStatementsOfOperations" roleURI="http://www.magnachip.com/role/ConsolidatedStatementsOfOperations" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedStatementsOfChangesInStockholdersEquity" roleURI="http://www.magnachip.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" roleURI="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivableTables" roleURI="http://www.magnachip.com/role/AccountsReceivableTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BusinessBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetail" roleURI="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DiscontinuedOperationsAndAssetsHeldForSaleAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsDetail" roleURI="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsAlternativeCashFlowInformationDetail" roleURI="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsAlternativeCashFlowInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurementsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/FairValueMeasurementsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" roleURI="http://www.magnachip.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurementsScheduleOfFairValueOfBorrowingsDetail" roleURI="http://www.magnachip.com/role/FairValueMeasurementsScheduleOfFairValueOfBorrowingsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurementsScheduleOfFairValueOfLongTermBorrowingsParentheticalDetail" roleURI="http://www.magnachip.com/role/FairValueMeasurementsScheduleOfFairValueOfLongTermBorrowingsParentheticalDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivableAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/AccountsReceivableAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#PropertyPlantAndEquipmentAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/PropertyPlantAndEquipmentAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#PropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetail" roleURI="http://www.magnachip.com/role/PropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IntangibleAssetsSummaryOfIntangibleAssetsDetail" roleURI="http://www.magnachip.com/role/IntangibleAssetsSummaryOfIntangibleAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/LeasesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesSupplementalBalanceSheetDetail" roleURI="http://www.magnachip.com/role/LeasesSupplementalBalanceSheetDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsDetailsOfDerivativeContractsDetail" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsDetailsOfDerivativeContractsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsFairValuesOfOutstandingZeroCostCollarAndForwardContractsRecordedAsAssetsAndLiabilitiesDetail" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsFairValuesOfOutstandingZeroCostCollarAndForwardContractsRecordedAsAssetsAndLiabilitiesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsAndLiabilitiesDetails" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsAndLiabilitiesDetails" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsDetail" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsImpactOfDerivativeInstrumentsOnConsolidatedStatementOfOperationsDetail" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsImpactOfDerivativeInstrumentsOnConsolidatedStatementOfOperationsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsCashDepositsDetails" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsCashDepositsDetails" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BorrowingsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/BorrowingsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BorrowingsComponentsOfLongTermBorrowingsDetail" roleURI="http://www.magnachip.com/role/BorrowingsComponentsOfLongTermBorrowingsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BorrowingsComponentsOfLongTermBorrowingsParentheticalDetail" roleURI="http://www.magnachip.com/role/BorrowingsComponentsOfLongTermBorrowingsParentheticalDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedSeveranceBenefitsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/AccruedSeveranceBenefitsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensationAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensationSummaryOfRestrictedStockUnitActivitiesDetail" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationSummaryOfRestrictedStockUnitActivitiesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarlyTerminationAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/EarlyTerminationAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesComponentsOfIncomeTaxExpenseBenefitAttributableToIncomeLossFromContinuingOperationsDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseBenefitAttributableToIncomeLossFromContinuingOperationsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#GeographicAndOtherInformationAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/GeographicAndOtherInformationAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#GeographicAndOtherInformationScheduleOfOperatingSegmentDetail" roleURI="http://www.magnachip.com/role/GeographicAndOtherInformationScheduleOfOperatingSegmentDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#GeographicAndOtherInformationNetSalesByRegionBasedOnLocationOfProductsAreBilledDetail" roleURI="http://www.magnachip.com/role/GeographicAndOtherInformationNetSalesByRegionBasedOnLocationOfProductsAreBilledDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccumulatedOtherComprehensiveIncomeLossChangesInAccumulatedOtherComprehensiveIncomeLossDetail" roleURI="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLossChangesInAccumulatedOtherComprehensiveIncomeLossDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShareAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/EarningsLossPerShareAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShareScheduleOfComputationOfBasicAndDilutedLossPerCommonShareParentheticalDetail" roleURI="http://www.magnachip.com/role/EarningsLossPerShareScheduleOfComputationOfBasicAndDilutedLossPerCommonShareParentheticalDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromTheComputationOfLossPerCommonShareDetail" roleURI="http://www.magnachip.com/role/EarningsLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromTheComputationOfLossPerCommonShareDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#MergerAgreementAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/MergerAgreementAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#SubsequentEventsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/SubsequentEventsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedBalanceSheets" roleURI="http://www.magnachip.com/role/ConsolidatedBalanceSheets" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.magnachip.com/role/ConsolidatedBalanceSheetsParenthetical" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedStatementsOfComprehensiveIncomeLoss" roleURI="http://www.magnachip.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ConsolidatedStatementsOfCashFlows" roleURI="http://www.magnachip.com/role/ConsolidatedStatementsOfCashFlows" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivableScheduleOfAccountsReceivableDetail" roleURI="http://www.magnachip.com/role/AccountsReceivableScheduleOfAccountsReceivableDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivableScheduleOfChangesInAllowanceForCreditLossesDetail" roleURI="http://www.magnachip.com/role/AccountsReceivableScheduleOfChangesInAllowanceForCreditLossesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivableScheduleOfChangesInSalesReturnReserveDetail" roleURI="http://www.magnachip.com/role/AccountsReceivableScheduleOfChangesInSalesReturnReserveDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#InventoriesSummaryOfInventoriesDetail" roleURI="http://www.magnachip.com/role/InventoriesSummaryOfInventoriesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#InventoriesChangesInInventoryReserveDetail" roleURI="http://www.magnachip.com/role/InventoriesChangesInInventoryReserveDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IntangibleAssetsAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/IntangibleAssetsAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedExpensesSummaryOfAccruedExpensesDetail" roleURI="http://www.magnachip.com/role/AccruedExpensesSummaryOfAccruedExpensesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedSeveranceBenefitsChangesInAccruedSeveranceBenefitsDetail" roleURI="http://www.magnachip.com/role/AccruedSeveranceBenefitsChangesInAccruedSeveranceBenefitsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensationSummaryOfStockOptionActivitiesDetail" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationSummaryOfStockOptionActivitiesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensationNumberAndWeightedAverageGrantDateFairValueOfUnvestedStockOptionsDetail" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationNumberAndWeightedAverageGrantDateFairValueOfUnvestedStockOptionsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ForeignCurrencyLossNetAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/ForeignCurrencyLossNetAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesDifferenceBetweenProvisionForDomesticAndForeignIncomeTaxesAndAmountCalculatedByStatutoryTaxRateToNetIncomeBeforeIncomeTaxesDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesDifferenceBetweenProvisionForDomesticAndForeignIncomeTaxesAndAmountCalculatedByStatutoryTaxRateToNetIncomeBeforeIncomeTaxesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesReconciliationOfTotalAmountsOfUnrecognizedTaxBenefitsDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesReconciliationOfTotalAmountsOfUnrecognizedTaxBenefitsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleOfAccumulatedOtherComprehensiveLossDetail" roleURI="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleOfAccumulatedOtherComprehensiveLossDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesChangesInValuationAllowanceForDeferredTaxAssetsOfContinuingOperationsAndDiscontinuedOperationsDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesChangesInValuationAllowanceForDeferredTaxAssetsOfContinuingOperationsAndDiscontinuedOperationsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BusinessBasisOfPresentationAndSignificantAccountingPolicies" roleURI="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSignificantAccountingPolicies" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" roleURI="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurements" roleURI="http://www.magnachip.com/role/FairValueMeasurements" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#FairValueMeasurementsTables" roleURI="http://www.magnachip.com/role/FairValueMeasurementsTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccountsReceivable" roleURI="http://www.magnachip.com/role/AccountsReceivable" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#Inventories" roleURI="http://www.magnachip.com/role/Inventories" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#InventoriesTables" roleURI="http://www.magnachip.com/role/InventoriesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#PropertyPlantAndEquipment" roleURI="http://www.magnachip.com/role/PropertyPlantAndEquipment" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#PropertyPlantAndEquipmentTables" roleURI="http://www.magnachip.com/role/PropertyPlantAndEquipmentTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IntangibleAssets" roleURI="http://www.magnachip.com/role/IntangibleAssets" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IntangibleAssetsTables" roleURI="http://www.magnachip.com/role/IntangibleAssetsTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedExpenses" roleURI="http://www.magnachip.com/role/AccruedExpenses" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedExpensesTables" roleURI="http://www.magnachip.com/role/AccruedExpensesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstruments" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstruments" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DerivativeFinancialInstrumentsTables" roleURI="http://www.magnachip.com/role/DerivativeFinancialInstrumentsTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ProductWarranties" roleURI="http://www.magnachip.com/role/ProductWarranties" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ProductWarrantiesTables" roleURI="http://www.magnachip.com/role/ProductWarrantiesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#Borrowings" roleURI="http://www.magnachip.com/role/Borrowings" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#BorrowingsTables" roleURI="http://www.magnachip.com/role/BorrowingsTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedSeveranceBenefits" roleURI="http://www.magnachip.com/role/AccruedSeveranceBenefits" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedSeveranceBenefitsTables" roleURI="http://www.magnachip.com/role/AccruedSeveranceBenefitsTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarlyTerminationAndOtherCharges" roleURI="http://www.magnachip.com/role/EarlyTerminationAndOtherCharges" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ForeignCurrencyLossNet" roleURI="http://www.magnachip.com/role/ForeignCurrencyLossNet" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxes" roleURI="http://www.magnachip.com/role/IncomeTaxes" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesTables" roleURI="http://www.magnachip.com/role/IncomeTaxesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#CommitmentsAndContingencies" roleURI="http://www.magnachip.com/role/CommitmentsAndContingencies" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccumulatedOtherComprehensiveIncomeLoss" roleURI="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLoss" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccumulatedOtherComprehensiveIncomeLossTables" roleURI="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLossTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShare" roleURI="http://www.magnachip.com/role/EarningsLossPerShare" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShareTables" roleURI="http://www.magnachip.com/role/EarningsLossPerShareTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#GeographicAndOtherInformation" roleURI="http://www.magnachip.com/role/GeographicAndOtherInformation" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#GeographicAndOtherInformationTables" roleURI="http://www.magnachip.com/role/GeographicAndOtherInformationTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensationTables" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#ProductWarrantiesScheduleOfChangesInAccruedWarrantyLiabilitiesDetail" roleURI="http://www.magnachip.com/role/ProductWarrantiesScheduleOfChangesInAccruedWarrantyLiabilitiesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesSummaryOfCompositionOfNetDeferredIncomeTaxAssetsLiabilitiesOfContinuingOperationsAndDiscontinuedOperationsDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesSummaryOfCompositionOfNetDeferredIncomeTaxAssetsLiabilitiesOfContinuingOperationsAndDiscontinuedOperationsDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#SubsequentEvents" roleURI="http://www.magnachip.com/role/SubsequentEvents" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesTables" roleURI="http://www.magnachip.com/role/LeasesTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesComponentsOfLeaseCostDetail" roleURI="http://www.magnachip.com/role/LeasesComponentsOfLeaseCostDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesOtherLeaseInformationDetail" roleURI="http://www.magnachip.com/role/LeasesOtherLeaseInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#LeasesAggregateFutureLeasePaymentDetail" roleURI="http://www.magnachip.com/role/LeasesAggregateFutureLeasePaymentDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" roleURI="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#Leases" roleURI="http://www.magnachip.com/role/Leases" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DiscontinuedOperationsAndAssetsHeldForSale" roleURI="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSale" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#DiscontinuedOperationsAndAssetsHeldForSaleTables" roleURI="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleTables" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#EarningsLossPerShareScheduleOfComputationOfBasicAndDilutedLossPerCommonShareDetail" roleURI="http://www.magnachip.com/role/EarningsLossPerShareScheduleOfComputationOfBasicAndDilutedLossPerCommonShareDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#IncomeTaxesSummaryOfValuationAllowancePrimarilyAttributableToItsSubsidiaryDetail" roleURI="http://www.magnachip.com/role/IncomeTaxesSummaryOfValuationAllowancePrimarilyAttributableToItsSubsidiaryDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#StockholdersEquityAndStockBasedCompensation" roleURI="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensation" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#AccruedSeveranceBenefitsFutureBenefitsPaymentsToEmployeesDetail" roleURI="http://www.magnachip.com/role/AccruedSeveranceBenefitsFutureBenefitsPaymentsToEmployeesDetail" />
<roleRef xlink:type="simple" xlink:href="mx-20211231.xsd#MergerAgreement" roleURI="http://www.magnachip.com/role/MergerAgreement" />
<roleRef xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd#eedm" roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" />
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/CoverPage">
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationLineItems" xlink:label="loc_dei_DocumentInformationLineItems_500358" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentInformationTable" xlink:label="loc_dei_DocumentInformationTable_500355" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentInformationTable_500355" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_500356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_500355" xlink:to="loc_us-gaap_StatementClassOfStockAxis_500356" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_500357" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_500356" xlink:to="loc_us-gaap_ClassOfStockDomain_500357" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_500357_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_500356" xlink:to="loc_us-gaap_ClassOfStockDomain_500357_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1302354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_500355" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1302354" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1302355" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1302354" xlink:to="loc_us-gaap_EquityComponentDomain_1302355" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1302355_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1302354" xlink:to="loc_us-gaap_EquityComponentDomain_1302355_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_1302356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1302355" xlink:to="loc_us-gaap_CommonStockMember_1302356" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_us-gaap_PreferredStockMember_1302357" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1302355" xlink:to="loc_us-gaap_PreferredStockMember_1302357" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_500359" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentType_500359" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_500360" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_AmendmentFlag_500360" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_500361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentPeriodEndDate_500361" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_500362" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentFiscalYearFocus_500362" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_500363" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentFiscalPeriodFocus_500363" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_500364" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityRegistrantName_500364" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_500365" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityCentralIndexKey_500365" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_500366" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_CurrentFiscalYearEndDate_500366" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_500367" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityCurrentReportingStatus_500367" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_500368" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityInteractiveDataCurrent_500368" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_500369" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityFilerCategory_500369" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_500370" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntitySmallBusiness_500370" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_500371" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityEmergingGrowthCompany_500371" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_500374" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityShellCompany_500374" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_500376" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_Security12bTitle_500376" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_500377" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_TradingSymbol_500377" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_500378" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_SecurityExchangeName_500378" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_500380" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_500380" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_719138" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityFileNumber_719138" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_719139" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityIncorporationStateCountryCode_719139" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_719140" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityTaxIdentificationNumber_719140" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_719141" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityAddressAddressLine1_719141" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_719143" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityAddressCityOrTown_719143" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_719144" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityAddressPostalZipCode_719144" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_719145" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_CityAreaCode_719145" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_719146" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_LocalPhoneNumber_719146" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_719149" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentTransitionReport_719149" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityAddressCountry" xlink:label="loc_dei_EntityAddressCountry_719153" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityAddressCountry_719153" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_DocumentAnnualReport" xlink:label="loc_dei_DocumentAnnualReport_813910" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_DocumentAnnualReport_813910" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_813977" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityPublicFloat_813977" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_813986" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_813986" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_813987" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_EntityVoluntaryFilers_813987" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_IcfrAuditorAttestationFlag" xlink:label="loc_dei_IcfrAuditorAttestationFlag_844830" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_IcfrAuditorAttestationFlag_844830" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AuditorName" xlink:label="loc_dei_AuditorName_1293004" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_AuditorName_1293004" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AuditorFirmId" xlink:label="loc_dei_AuditorFirmId_1293005" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_AuditorFirmId_1293005" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_AuditorLocation" xlink:label="loc_dei_AuditorLocation_1293006" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_AuditorLocation_1293006" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_NoTradingSymbolFlag" xlink:label="loc_dei_NoTradingSymbolFlag_1302358" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_500358" xlink:to="loc_dei_NoTradingSymbolFlag_1302358" use="optional" order="46" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/ConsolidatedStatementsOfOperations">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_685778" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_77" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_77" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_82" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_NetIncomeLoss_82" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_78" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_78" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_75" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_GrossProfit_75" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_73" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_Revenues_73" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_74" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_74" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_79" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_79" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_686051" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_686051" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_685809" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_686051" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_685809" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_465178" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_686051" xlink:to="loc_us-gaap_EarningsPerShareDiluted_465178" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_685808" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_686051" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_685808" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_685782" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_685782" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_500420" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_685782" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_500420" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_500424" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_685782" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_500424" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_76" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_OperatingIncomeLoss_76" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_80" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_81" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_81" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_310318" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_310318" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_685781" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_685781" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_719162" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_685781" xlink:to="loc_us-gaap_EarningsPerShareBasic_719162" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_500415" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_685781" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_500415" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_500417" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_685781" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_500417" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_685779" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_OperatingExpensesAbstract_685779" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_87" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_685779" xlink:to="loc_us-gaap_OperatingExpenses_87" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_84" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_685779" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_84" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_83" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_685779" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_83" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarlyTerminationAndOtherChargesNet" xlink:label="loc_mx_EarlyTerminationAndOtherChargesNet_844691" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_685779" xlink:to="loc_mx_EarlyTerminationAndOtherChargesNet_844691" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MergerrelatedCostsIncomeNet" xlink:label="loc_mx_MergerrelatedCostsIncomeNet_1277132" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_685779" xlink:to="loc_mx_MergerrelatedCostsIncomeNet_1277132" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_685791" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_685791" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_685799" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_685799" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_685775" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_685778" xlink:to="loc_us-gaap_StatementTable_685775" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_685783" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_685775" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_685783" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_685784" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_685783" xlink:to="loc_us-gaap_SegmentDomain_685784" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_685784_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_685783" xlink:to="loc_us-gaap_SegmentDomain_685784_default" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FabThreeFoundryServicesMember" xlink:label="loc_mx_FabThreeFoundryServicesMember_685786" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_685784" xlink:to="loc_mx_FabThreeFoundryServicesMember_685786" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardProductsBusinessMember" xlink:label="loc_mx_StandardProductsBusinessMember_685785" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_685784" xlink:to="loc_mx_StandardProductsBusinessMember_685785" use="optional" order="36" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_104" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_113" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_114" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_114" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_119" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_119" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_115" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_115" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_117" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_117" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StatementTable_105" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_103" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_105" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_103" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_102" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_103" xlink:to="loc_us-gaap_EquityComponentDomain_102" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_102_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_103" xlink:to="loc_us-gaap_EquityComponentDomain_102_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_108" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_108" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_107" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_us-gaap_CommonStockMember_107" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_110" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_us-gaap_TreasuryStockMember_110" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_109" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_us-gaap_RetainedEarningsMember_109" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_CommonStockOutstandingMember" xlink:label="loc_mx_CommonStockOutstandingMember_106" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_mx_CommonStockOutstandingMember_106" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_111" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_102" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_111" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_719515" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_105" xlink:to="loc_srt_RestatementAxis_719515" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_719517" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_719515" xlink:to="loc_srt_RestatementDomain_719517" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_719517_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_719515" xlink:to="loc_srt_RestatementDomain_719517_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_118" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_118" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_116" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_116" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_122" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_NetIncomeLoss_122" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_120" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_120" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_112" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockholdersEquity_112" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_121" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_121" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_1278351" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_1278351" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcceleratedShareRepurchaseProgramAdjustment" xlink:label="loc_us-gaap_AcceleratedShareRepurchaseProgramAdjustment_1278350" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_AcceleratedShareRepurchaseProgramAdjustment_1278350" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_Acceleratedsharerepurchaseprogramadjustmentshares" xlink:label="loc_mx_Acceleratedsharerepurchaseprogramadjustmentshares_1277428" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_mx_Acceleratedsharerepurchaseprogramadjustmentshares_1277428" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_1277418" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_104" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_1277418" use="optional" order="28" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_310491" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_310488" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_310491" xlink:to="loc_us-gaap_StatementTable_310488" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_310489" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310488" xlink:to="loc_us-gaap_StatementClassOfStockAxis_310489" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_310490" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_310489" xlink:to="loc_us-gaap_ClassOfStockDomain_310490" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_310490_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_310489" xlink:to="loc_us-gaap_ClassOfStockDomain_310490_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_310506" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310488" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_310506" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_310507" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_310506" xlink:to="loc_us-gaap_TypeOfAdoptionMember_310507" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_310507_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_310506" xlink:to="loc_us-gaap_TypeOfAdoptionMember_310507_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfPropertyPlantAndEquipmentEstimatedUsefulLifeTableTextBlock" xlink:label="loc_mx_ScheduleOfPropertyPlantAndEquipmentEstimatedUsefulLifeTableTextBlock_310499" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310491" xlink:to="loc_mx_ScheduleOfPropertyPlantAndEquipmentEstimatedUsefulLifeTableTextBlock_310499" use="optional" order="8" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/AccountsReceivableTables">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_1152" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_1156" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_1156" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCreditLossesForFinancingReceivablesCurrentTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCreditLossesForFinancingReceivablesCurrentTableTextBlock_1157" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152" xlink:to="loc_us-gaap_ScheduleOfCreditLossesForFinancingReceivablesCurrentTableTextBlock_1157" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1153" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1152" xlink:to="loc_us-gaap_StatementTable_1153" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1155" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1153" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1155" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1155" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_1155" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AllowanceForSalesReturnMember" xlink:label="loc_mx_AllowanceForSalesReturnMember_285401" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154" xlink:to="loc_mx_AllowanceForSalesReturnMember_285401" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForCreditLossMember" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_1158" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_1154" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_1158" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfChangesInVolumeDiscountsAccountsReceivableTableTextBlock" xlink:label="loc_mx_ScheduleOfChangesInVolumeDiscountsAccountsReceivableTableTextBlock_310872" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1152" xlink:to="loc_mx_ScheduleOfChangesInVolumeDiscountsAccountsReceivableTableTextBlock_310872" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EmployeesEligibleForSeveranceBenefitsPercentage" xlink:label="loc_mx_EmployeesEligibleForSeveranceBenefitsPercentage_204" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_mx_EmployeesEligibleForSeveranceBenefitsPercentage_204" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable" xlink:label="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_185" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_185" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_186" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_185" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_186" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_186_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_185" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_186_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntellectualPropertyMember" xlink:label="loc_us-gaap_IntellectualPropertyMember_214" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_186" xlink:to="loc_us-gaap_IntellectualPropertyMember_214" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_193" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_193" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_194" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_193" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_194" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_194_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_193" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_194_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_181" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_181" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_182" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_181" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_182" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_182_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_181" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_182_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_196" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_182" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_196" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_187" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_187" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_188" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_187" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_188" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_188_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_187" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_188_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_189" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_srt_RangeAxis_189" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_190" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_189" xlink:to="loc_srt_RangeMember_190" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_190_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_189" xlink:to="loc_srt_RangeMember_190_default" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_217" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_190" xlink:to="loc_srt_MaximumMember_217" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_192" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_192" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_191" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_192" xlink:to="loc_us-gaap_SegmentDomain_191" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_191_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_192" xlink:to="loc_us-gaap_SegmentDomain_191_default" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FoundryServicesGroupMember" xlink:label="loc_mx_FoundryServicesGroupMember_689536" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_191" xlink:to="loc_mx_FoundryServicesGroupMember_689536" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MxFoundryServicesGroupMember" xlink:label="loc_mx_MxFoundryServicesGroupMember_764661" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_191" xlink:to="loc_mx_MxFoundryServicesGroupMember_764661" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_310671" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_310671" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_310673" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_310671" xlink:to="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_310673" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_310673_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_310671" xlink:to="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_310673_default" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_310773" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_srt_RestatementAxis_310773" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_310774" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_310773" xlink:to="loc_srt_RestatementDomain_310774" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_310774_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_310773" xlink:to="loc_srt_RestatementDomain_310774_default" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_312553" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_srt_ProductOrServiceAxis_312553" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_312554" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_312553" xlink:to="loc_srt_ProductsAndServicesDomain_312554" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_312554_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_312553" xlink:to="loc_srt_ProductsAndServicesDomain_312554_default" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShippingAndHandlingMember" xlink:label="loc_us-gaap_ShippingAndHandlingMember_312556" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_312554" xlink:to="loc_us-gaap_ShippingAndHandlingMember_312556" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_180" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_180" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_180" xlink:to="loc_us-gaap_TypeOfAdoptionMember_195" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_195_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_180" xlink:to="loc_us-gaap_TypeOfAdoptionMember_195_default" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_686086" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable_184" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_686086" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_686087" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_686086" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_686087" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_686087_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_686086" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_686087_default" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxRecognizedTaxPositionRealizedUponUltimateSettlement" xlink:label="loc_mx_IncomeTaxRecognizedTaxPositionRealizedUponUltimateSettlement_210" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_mx_IncomeTaxRecognizedTaxPositionRealizedUponUltimateSettlement_210" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdvertisingExpense" xlink:label="loc_us-gaap_AdvertisingExpense_207" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_AdvertisingExpense_207" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_203" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_203" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Supplies" xlink:label="loc_us-gaap_Supplies_200" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_Supplies_200" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalCashAndCashEquivalentRelatedText" xlink:label="loc_us-gaap_AdditionalCashAndCashEquivalentRelatedText_199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_AdditionalCashAndCashEquivalentRelatedText_199" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuePerformanceObligationDescriptionOfPaymentTerms" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfPaymentTerms_310711" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfPaymentTerms_310711" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_310734" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_310734" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_312552" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_312552" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuePerformanceObligationDescriptionOfTiming" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_310712" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_310712" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_310715" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_DeferredRevenueCurrent_310715" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_764662" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_764662" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_764663" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_764663" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_767342" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems_183" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_767342" use="optional" order="54" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BusinessBasisOfPresentationAndSummaryOfSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_224" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_228" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_224" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_228" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_226" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_228" xlink:to="loc_srt_RangeAxis_226" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_227" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_226" xlink:to="loc_srt_RangeMember_227" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_227_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_226" xlink:to="loc_srt_RangeMember_227_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_235" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_227" xlink:to="loc_srt_MaximumMember_235" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_234" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_227" xlink:to="loc_srt_MinimumMember_234" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_223" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_228" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_223" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_223" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_223" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_233" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_233" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_231" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_231" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_230" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" xlink:to="loc_us-gaap_BuildingMember_230" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_232" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_225" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_232" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_229" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_224" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_229" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_RestructuringAndOtherExpenses" xlink:label="loc_mx_RestructuringAndOtherExpenses_685932" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" xlink:to="loc_mx_RestructuringAndOtherExpenses_685932" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_689476" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" xlink:to="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_689476" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_689480" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_689476" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_689480" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_689481" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_689480" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_689481" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_689481_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_689480" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_689481_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FoundryServicesGroupAndFabFourMember" xlink:label="loc_mx_FoundryServicesGroupAndFabFourMember_689539" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_689481" xlink:to="loc_mx_FoundryServicesGroupAndFabFourMember_689539" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_764665" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_689476" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_764665" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_764666" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_764665" xlink:to="loc_us-gaap_SegmentDomain_764666" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_764666_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_764665" xlink:to="loc_us-gaap_SegmentDomain_764666_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MxFoundryServicesGroupMember" xlink:label="loc_mx_MxFoundryServicesGroupMember_764667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_764666" xlink:to="loc_mx_MxFoundryServicesGroupMember_764667" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_RestructuringRelatedCharge" xlink:label="loc_mx_RestructuringRelatedCharge_685934" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" xlink:to="loc_mx_RestructuringRelatedCharge_685934" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_763055" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_763055" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationAmountOfContinuingCashFlowsAfterDisposal" xlink:label="loc_us-gaap_DiscontinuedOperationAmountOfContinuingCashFlowsAfterDisposal_849282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_689479" xlink:to="loc_us-gaap_DiscontinuedOperationAmountOfContinuingCashFlowsAfterDisposal_849282" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsDetail">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_685855" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_685855" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685858" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_685855" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685858" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685858" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685858" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FoundryServicesGroupMember" xlink:label="loc_mx_FoundryServicesGroupMember_685860" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859" xlink:to="loc_mx_FoundryServicesGroupMember_685860" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FabThreeFoundryServicesMember" xlink:label="loc_mx_FabThreeFoundryServicesMember_685861" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685859" xlink:to="loc_mx_FabThreeFoundryServicesMember_685861" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_691044" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementTable_685855" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_691044" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_691045" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_691044" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_691045" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_691045_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_691044" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_691045_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDiscontinuedOperationsMember" xlink:label="loc_us-gaap_SegmentDiscontinuedOperationsMember_691046" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_691045" xlink:to="loc_us-gaap_SegmentDiscontinuedOperationsMember_691046" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_685865" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_RevenuesAbstract_685865" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_685864" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_685865" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_685864" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupincludingDiscontinuedoperationRevenues" xlink:label="loc_mx_DisposalGroupincludingDiscontinuedoperationRevenues_689894" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_685865" xlink:to="loc_mx_DisposalGroupincludingDiscontinuedoperationRevenues_689894" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenueAbstract" xlink:label="loc_us-gaap_CostOfRevenueAbstract_685867" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_CostOfRevenueAbstract_685867" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_685868" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_685867" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_685868" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupIncludingDiscontinuedOperationCostOfGoodsSold" xlink:label="loc_mx_DisposalGroupIncludingDiscontinuedOperationCostOfGoodsSold_689969" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_685867" xlink:to="loc_mx_DisposalGroupIncludingDiscontinuedOperationCostOfGoodsSold_689969" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_mx_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax_691042" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_mx_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax_691042" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_763134" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax_763134" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DiscontinuedOperationTransactionCosts" xlink:label="loc_mx_DiscontinuedOperationTransactionCosts_766672" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_mx_DiscontinuedOperationTransactionCosts_766672" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_685870" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_685870" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_685869" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_685869" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_691036" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_OperatingExpensesAbstract_691036" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense" xlink:label="loc_mx_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense_691038" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_691036" xlink:to="loc_mx_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense_691038" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_691041" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_691036" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense_691041" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_691037" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_691036" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_691037" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupIncludingDiscontinuedOperationRestructuringAndOtherExpenses" xlink:label="loc_mx_DisposalGroupIncludingDiscontinuedOperationRestructuringAndOtherExpenses_691039" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_691036" xlink:to="loc_mx_DisposalGroupIncludingDiscontinuedOperationRestructuringAndOtherExpenses_691039" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_685871" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_685871" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss" xlink:label="loc_mx_DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss_691043" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_mx_DisposalGroupIncludingDiscontinuedOperationOtherIncomeLoss_691043" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_685872" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_685872" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_685873" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationIncomeStatementLineItems_685863" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_685873" use="optional" order="30" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DiscontinuedOperationsAndAssetsHeldForSaleScheduleOfResultsFromDiscontinuedOperationsAlternativeCashFlowInformationDetail">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationLineItems" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationLineItems_685918" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract_685919" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationLineItems_685918" xlink:to="loc_us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract_685919" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationAndAmortizationDiscontinuedOperations" xlink:label="loc_us-gaap_DepreciationAndAmortizationDiscontinuedOperations_685922" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract_685919" xlink:to="loc_us-gaap_DepreciationAndAmortizationDiscontinuedOperations_685922" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ProvisionForSeveranceBenefitsDiscontinuedOperations" xlink:label="loc_mx_ProvisionForSeveranceBenefitsDiscontinuedOperations_685924" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract_685919" xlink:to="loc_mx_ProvisionForSeveranceBenefitsDiscontinuedOperations_685924" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StockBasedCompensationDiscontinuedOperations" xlink:label="loc_mx_StockBasedCompensationDiscontinuedOperations_685925" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DiscontinuedOperationAlternativeCashFlowInformationAbstract_685919" xlink:to="loc_mx_StockBasedCompensationDiscontinuedOperations_685925" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationTable" xlink:label="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationTable_685913" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationLineItems_685918" xlink:to="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationTable_685913" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685914" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationTable_685913" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685914" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685915" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685914" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685915" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685915_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_685914" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685915_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FoundryServicesGroupAndFabThreeFoundryServicesMember" xlink:label="loc_mx_FoundryServicesGroupAndFabThreeFoundryServicesMember_685917" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_685915" xlink:to="loc_mx_FoundryServicesGroupAndFabThreeFoundryServicesMember_685917" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_685926" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_ScheduleOfDisposalGroupNotDiscontinuedOperationAlternativeCashFlowInformationLineItems_685918" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_685926" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalExpenditureDiscontinuedOperations" xlink:label="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_685927" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_685926" xlink:to="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_685927" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/FairValueMeasurementsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_305" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_305" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_303" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_310856" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_310856" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_309" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_309" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_306" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_306" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_312303" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_312303" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" xlink:to="loc_us-gaap_DebtInstrumentAxis_293" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_294" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_293" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_294" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_294_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_293" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_294_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_302" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_294" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_302" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_298" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_298" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_298" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_297" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_297_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_298" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_297_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OtherAssetClassMember" xlink:label="loc_mx_OtherAssetClassMember_310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_297" xlink:to="loc_mx_OtherAssetClassMember_310" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_310861" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_310861" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_310862" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_310861" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_310862" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_310862_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_310861" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_310862_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_310863" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_310862" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_310863" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_299" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_296" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_299" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_300" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_299" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_300" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_300_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_299" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_300_default" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_312" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_300" xlink:to="loc_mx_ExchangeableSeniorNotesMember_312" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_295" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_308" use="optional" order="24" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_240" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_240" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_238" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_238" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_239" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_238" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_239" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_239_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_238" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_239_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_251" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_239" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_251" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_250" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_239" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_250" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_243" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_243" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_243" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_243" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_285891" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_285891" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_285892" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_285890" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_285892" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_246" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_246" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_246_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_246_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_255" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_246" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_255" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_242" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_241" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_242" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_247" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_242" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_247" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_247_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_242" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_247_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_256" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_247" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_256" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_249" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_240" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_249" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_249" xlink:to="loc_us-gaap_DerivativeLiabilities_258" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_248" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_240" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_248" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_257" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_248" xlink:to="loc_us-gaap_DerivativeAssets_257" use="optional" order="23" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/FairValueMeasurementsScheduleOfFairValueOfBorrowingsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_264" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFairValueDisclosureAbstract" xlink:label="loc_us-gaap_DebtInstrumentFairValueDisclosureAbstract_262" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_264" xlink:to="loc_us-gaap_DebtInstrumentFairValueDisclosureAbstract_262" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_270" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentFairValueDisclosureAbstract_262" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_270" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableFairValueDisclosure" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_271" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentFairValueDisclosureAbstract_262" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_271" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_265" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_264" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_265" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_261" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_265" xlink:to="loc_us-gaap_DebtInstrumentAxis_261" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_263" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_261" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_263" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_263_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_261" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_263_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_272" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_263" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_272" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_266" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_265" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_266" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_267" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_266" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_267" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_267_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_266" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_267_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_274" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_267" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_274" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_268" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_265" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_268" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_269" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_269" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_269_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_269_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_275" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_269" xlink:to="loc_mx_ExchangeableSeniorNotesMember_275" use="optional" order="16" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/FairValueMeasurementsScheduleOfFairValueOfLongTermBorrowingsParentheticalDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_281" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_288" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_281" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_288" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_287" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_281" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_287" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_281" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_282" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_283" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_282" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_283" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_284" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_283" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_284" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_284_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_283" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_284_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_289" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_284" xlink:to="loc_mx_ExchangeableSeniorNotesMember_289" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_279" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_282" xlink:to="loc_us-gaap_DebtInstrumentAxis_279" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_280" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_279" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_280" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_280_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_279" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_280_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_285" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_280" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_285" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/AccountsReceivableAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_343" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnSaleOfAccountsReceivable" xlink:label="loc_us-gaap_GainLossOnSaleOfAccountsReceivable_350" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_343" xlink:to="loc_us-gaap_GainLossOnSaleOfAccountsReceivable_350" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleAndCollectionOfReceivables" xlink:label="loc_us-gaap_ProceedsFromSaleAndCollectionOfReceivables_349" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_343" xlink:to="loc_us-gaap_ProceedsFromSaleAndCollectionOfReceivables_349" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_348" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_343" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_348" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_344" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_348" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_344" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_347" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_344" xlink:to="loc_us-gaap_ReceivableTypeDomain_347" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivableTypeDomain" xlink:label="loc_us-gaap_ReceivableTypeDomain_347_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_344" xlink:to="loc_us-gaap_ReceivableTypeDomain_347_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeAccountsReceivableMember" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_347" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_352" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_345" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_348" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_345" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_346" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_345" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_346" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_346_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_345" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_346_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_351" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_346" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_351" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/PropertyPlantAndEquipmentAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_310961" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_386" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_310961" xlink:to="loc_us-gaap_Depreciation_386" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_310957" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_310961" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_310957" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_310958" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_310957" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_310958" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_310959" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_310958" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_310959" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_310959_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_310958" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_310959_default" use="optional" order="5" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/PropertyPlantAndEquipmentSummaryOfPropertyPlantAndEquipmentDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_379" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_379" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_378" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_378" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_377" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_377" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_376" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_376" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_373" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_376" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_373" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_373" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_373" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FinanceLeaseRightOfUseAssetsMember" xlink:label="loc_mx_FinanceLeaseRightOfUseAssetsMember_410819" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" xlink:to="loc_mx_FinanceLeaseRightOfUseAssetsMember_410819" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_380" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_380" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_381" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_381" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_382" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_375" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_382" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Land" xlink:label="loc_us-gaap_Land_1278464" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_Land_1278464" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_1278465" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_374" xlink:to="loc_us-gaap_ConstructionInProgressGross_1278465" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/IntangibleAssetsSummaryOfIntangibleAssetsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_390" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_394" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_390" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_394" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_393" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_390" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_393" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_395" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_390" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_395" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_392" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_390" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_392" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_389" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_392" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_389" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_391" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_389" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_391" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_391_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_389" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_391_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntellectualPropertyMember" xlink:label="loc_us-gaap_IntellectualPropertyMember_398" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_391" xlink:to="loc_us-gaap_IntellectualPropertyMember_398" use="optional" order="8" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/LeasesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_410568" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_410565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_410568" xlink:to="loc_us-gaap_StatementTable_410565" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_410566" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_410565" xlink:to="loc_srt_RangeAxis_410566" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_410570" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_410566" xlink:to="loc_srt_RangeMember_410570" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_410570_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_410566" xlink:to="loc_srt_RangeMember_410570_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_410571" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_410570" xlink:to="loc_srt_MaximumMember_410571" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_410572" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_410570" xlink:to="loc_srt_MinimumMember_410572" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_RemainingLeaseTerm" xlink:label="loc_mx_RemainingLeaseTerm_410574" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410568" xlink:to="loc_mx_RemainingLeaseTerm_410574" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_1292792" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410568" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_1292792" use="optional" order="8" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/LeasesSupplementalBalanceSheetDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_410587" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LeasesAssetsAbstract" xlink:label="loc_mx_LeasesAssetsAbstract_412311" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410587" xlink:to="loc_mx_LeasesAssetsAbstract_412311" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_410589" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeasesAssetsAbstract_412311" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_410589" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LeaseRightOfUseAsset" xlink:label="loc_mx_LeaseRightOfUseAsset_410590" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeasesAssetsAbstract_412311" xlink:to="loc_mx_LeaseRightOfUseAsset_410590" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_410588" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeasesAssetsAbstract_412311" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_410588" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_1279323" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeasesAssetsAbstract_412311" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_1279323" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_410584" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_410587" xlink:to="loc_us-gaap_StatementTable_410584" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_410585" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_410584" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_410585" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_410586" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_410585" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_410586" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_410586_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_410585" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_410586_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_CurrentOperatingLeaseLiabilitiesMember" xlink:label="loc_mx_CurrentOperatingLeaseLiabilitiesMember_465300" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_mx_CurrentOperatingLeaseLiabilitiesMember_465300" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_410601" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_410601" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_NonCurrentoperatingLeaseLiabilitiesMember" xlink:label="loc_mx_NonCurrentoperatingLeaseLiabilitiesMember_410600" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_mx_NonCurrentoperatingLeaseLiabilitiesMember_410600" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OperatingLeaseRightOfUseAssetsMember" xlink:label="loc_mx_OperatingLeaseRightOfUseAssetsMember_410597" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_mx_OperatingLeaseRightOfUseAssetsMember_410597" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_410598" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_410598" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_410599" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_410586" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_410599" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LeaseLiabilitiesCurrentAbstract" xlink:label="loc_mx_LeaseLiabilitiesCurrentAbstract_412314" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410587" xlink:to="loc_mx_LeaseLiabilitiesCurrentAbstract_412314" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_410592" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesCurrentAbstract_412314" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_410592" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_410593" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesCurrentAbstract_412314" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_410593" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_1279301" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesCurrentAbstract_412314" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_1279301" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LeaseLiabilities" xlink:label="loc_mx_LeaseLiabilities_410596" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410587" xlink:to="loc_mx_LeaseLiabilities_410596" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LeaseLiabilitiesNoncurrentAbstract" xlink:label="loc_mx_LeaseLiabilitiesNoncurrentAbstract_412319" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_410587" xlink:to="loc_mx_LeaseLiabilitiesNoncurrentAbstract_412319" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_410594" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesNoncurrentAbstract_412319" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_410594" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_410595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesNoncurrentAbstract_412319" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_410595" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_1279310" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_LeaseLiabilitiesNoncurrentAbstract_412319" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_1279310" use="optional" order="24" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_513" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred_519" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_513" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred_519" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_CashCollateralForCoveringCreditExposureInDerivatives" xlink:label="loc_mx_CashCollateralForCoveringCreditExposureInDerivatives_522" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_513" xlink:to="loc_mx_CashCollateralForCoveringCreditExposureInDerivatives_522" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_514" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_513" xlink:to="loc_us-gaap_DerivativeTable_514" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis" xlink:label="loc_srt_CounterpartyNameAxis_510" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_514" xlink:to="loc_srt_CounterpartyNameAxis_510" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_510" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_510" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_NomuraFinancialInvestmentCoLtdMember" xlink:label="loc_mx_NomuraFinancialInvestmentCoLtdMember_524" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515" xlink:to="loc_mx_NomuraFinancialInvestmentCoLtdMember_524" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardCharteredBankKoreaLimitedMember" xlink:label="loc_mx_StandardCharteredBankKoreaLimitedMember_1278822" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_515" xlink:to="loc_mx_StandardCharteredBankKoreaLimitedMember_1278822" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_512" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_514" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_512" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_511" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_512" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_511" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_511_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_512" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_511_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarAndForwardContractsMember" xlink:label="loc_mx_ZeroCostCollarAndForwardContractsMember_517" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_511" xlink:to="loc_mx_ZeroCostCollarAndForwardContractsMember_517" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_470640" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_514" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_470640" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_470641" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_470640" xlink:to="loc_us-gaap_TypeOfAdoptionMember_470641" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_470641_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_470640" xlink:to="loc_us-gaap_TypeOfAdoptionMember_470641_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MinimumSumOfQualifiedAndUnrestrictedCashAndCashEquivalents" xlink:label="loc_mx_MinimumSumOfQualifiedAndUnrestrictedCashAndCashEquivalents_523" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_513" xlink:to="loc_mx_MinimumSumOfQualifiedAndUnrestrictedCashAndCashEquivalents_523" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ThresholdAmountCashCollateralForeignCurrencyExposure" xlink:label="loc_mx_ThresholdAmountCashCollateralForeignCurrencyExposure_521" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_513" xlink:to="loc_mx_ThresholdAmountCashCollateralForeignCurrencyExposure_521" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsDetailsOfDerivativeContractsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_437" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DerivativeSettlementEndDateMonthYear" xlink:label="loc_mx_DerivativeSettlementEndDateMonthYear_446" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_mx_DerivativeSettlementEndDateMonthYear_446" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DerivativeSettlementStartDateMonthYear" xlink:label="loc_mx_DerivativeSettlementStartDateMonthYear_445" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_mx_DerivativeSettlementStartDateMonthYear_445" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount" xlink:label="loc_us-gaap_DerivativeNotionalAmount_444" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_us-gaap_DerivativeNotionalAmount_444" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DescriptionOfTypeOfCashFlowHedgingInstrumentsUsed" xlink:label="loc_mx_DescriptionOfTypeOfCashFlowHedgingInstrumentsUsed_443" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_mx_DescriptionOfTypeOfCashFlowHedgingInstrumentsUsed_443" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_438" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_us-gaap_DerivativeTable_438" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_436" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_438" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_436" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_435" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_436" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_435" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_435_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_436" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_435_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarThreeMember" xlink:label="loc_mx_ZeroCostCollarThreeMember_466291" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_435" xlink:to="loc_mx_ZeroCostCollarThreeMember_466291" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarOneMember" xlink:label="loc_mx_ZeroCostCollarOneMember_439" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_435" xlink:to="loc_mx_ZeroCostCollarOneMember_439" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarTwoMember" xlink:label="loc_mx_ZeroCostCollarTwoMember_440" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_435" xlink:to="loc_mx_ZeroCostCollarTwoMember_440" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInceptionDates" xlink:label="loc_us-gaap_DerivativeInceptionDates_442" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_437" xlink:to="loc_us-gaap_DerivativeInceptionDates_442" use="optional" order="12" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsFairValuesOfOutstandingZeroCostCollarAndForwardContractsRecordedAsAssetsAndLiabilitiesDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_455" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilityFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_454" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_455" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_454" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_462" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_454" xlink:to="loc_us-gaap_DerivativeLiabilities_462" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssetFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeAssetFairValueNetAbstract_451" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_455" xlink:to="loc_us-gaap_DerivativeAssetFairValueNetAbstract_451" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_459" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetFairValueNetAbstract_451" xlink:to="loc_us-gaap_DerivativeAssets_459" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_456" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_455" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_456" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_449" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_456" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_449" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_450" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_449" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_450" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_450_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_449" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_450_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_457" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_450" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_457" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_458" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_450" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_458" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_453" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_456" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_453" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_452" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_453" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_452" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_452_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_453" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_452_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarsMember" xlink:label="loc_mx_ZeroCostCollarsMember_460" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_452" xlink:to="loc_mx_ZeroCostCollarsMember_460" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsAndLiabilitiesDetails">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_500537" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_500536" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_500537" xlink:to="loc_us-gaap_DerivativeTable_500536" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_500541" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_500536" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_500541" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_500542" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_500541" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_500542" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_500542_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_500541" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_500542_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarsMember" xlink:label="loc_mx_ZeroCostCollarsMember_500543" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_500542" xlink:to="loc_mx_ZeroCostCollarsMember_500543" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssetFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeAssetFairValueNetAbstract_500571" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_500537" xlink:to="loc_us-gaap_DerivativeAssetFairValueNetAbstract_500571" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_500580" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetFairValueNetAbstract_500571" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_500580" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_500574" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetFairValueNetAbstract_500571" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_500574" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_500576" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetFairValueNetAbstract_500571" xlink:to="loc_us-gaap_DerivativeAssets_500576" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilityFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_500573" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_500537" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_500573" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet" xlink:label="loc_us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet_500557" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_500573" xlink:to="loc_us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet_500557" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_501477" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_500573" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_501477" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_500548" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_500573" xlink:to="loc_us-gaap_DerivativeLiabilities_500548" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsOffsettingOfDerivativeAssetsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_467" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_476" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_467" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_476" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_473" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_467" xlink:to="loc_us-gaap_DerivativeAssets_473" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_475" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_467" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_475" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_471" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_467" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_471" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_468" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_467" xlink:to="loc_us-gaap_DerivativeTable_468" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_466" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_468" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_466" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_465" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_466" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_465" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_465_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_466" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_465_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarsMember" xlink:label="loc_mx_ZeroCostCollarsMember_469" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_465" xlink:to="loc_mx_ZeroCostCollarsMember_469" use="optional" order="9" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsImpactOfDerivativeInstrumentsOnConsolidatedStatementOfOperationsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_495" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_503" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_495" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_503" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet_504" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_495" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet_504" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_502" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_495" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_502" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_496" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_495" xlink:to="loc_us-gaap_DerivativeTable_496" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_493" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_496" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_493" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_492" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_493" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_492" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_492_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_493" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_492_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarsMember" xlink:label="loc_mx_ZeroCostCollarsMember_500" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_492" xlink:to="loc_mx_ZeroCostCollarsMember_500" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_494" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_496" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_494" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_497" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_494" xlink:to="loc_us-gaap_HedgingRelationshipDomain_497" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_497_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_494" xlink:to="loc_us-gaap_HedgingRelationshipDomain_497_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_505" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_497" xlink:to="loc_us-gaap_CashFlowHedgingMember_505" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_498" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_496" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_498" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_499" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_498" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_499" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_499_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_498" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_499_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesMember" xlink:label="loc_us-gaap_SalesMember_507" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_499" xlink:to="loc_us-gaap_SalesMember_507" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_506" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_499" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_506" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/DerivativeFinancialInstrumentsCashDepositsDetails">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DepositAssetsLineItems" xlink:label="loc_mx_DepositAssetsLineItems_815369" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DepositAssetsTable" xlink:label="loc_mx_DepositAssetsTable_815353" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_DepositAssetsLineItems_815369" xlink:to="loc_mx_DepositAssetsTable_815353" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_815354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_DepositAssetsTable_815353" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_815354" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_815359" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_815354" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_815359" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_815359_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_815354" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_815359_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ZeroCostCollarAndForwardContractsMember" xlink:label="loc_mx_ZeroCostCollarAndForwardContractsMember_815361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_815359" xlink:to="loc_mx_ZeroCostCollarAndForwardContractsMember_815361" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis" xlink:label="loc_srt_CounterpartyNameAxis_815357" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_DepositAssetsTable_815353" xlink:to="loc_srt_CounterpartyNameAxis_815357" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_815357" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_815357" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_NomuraFinancialInvestmentCoLtdMember" xlink:label="loc_mx_NomuraFinancialInvestmentCoLtdMember_815363" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362" xlink:to="loc_mx_NomuraFinancialInvestmentCoLtdMember_815363" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardCharteredBankKoreaLimitedMember" xlink:label="loc_mx_StandardCharteredBankKoreaLimitedMember_815366" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_815362" xlink:to="loc_mx_StandardCharteredBankKoreaLimitedMember_815366" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_819148" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_DepositAssetsTable_815353" xlink:to="loc_srt_StatementGeographicalAxis_819148" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_819149" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_819148" xlink:to="loc_srt_SegmentGeographicalDomain_819149" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_819149_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_819148" xlink:to="loc_srt_SegmentGeographicalDomain_819149_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/exch/2021/exch-2021.xsd#exch_DBAG" xlink:label="loc_exch_DBAG_819150" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_819149" xlink:to="loc_exch_DBAG_819150" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MarginDepositAssets" xlink:label="loc_us-gaap_MarginDepositAssets_815371" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_DepositAssetsLineItems_815369" xlink:to="loc_us-gaap_MarginDepositAssets_815371" use="optional" order="15" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BorrowingsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_564" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DebtInstrumentPricing" xlink:label="loc_mx_DebtInstrumentPricing_574" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_mx_DebtInstrumentPricing_574" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_571" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_571" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DebtInstrumentConvertibleConversionPriceDenominationValue" xlink:label="loc_mx_DebtInstrumentConvertibleConversionPriceDenominationValue_577" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_mx_DebtInstrumentConvertibleConversionPriceDenominationValue_577" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_568" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentTable_568" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_566" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_568" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_566" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_567" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_566" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_567" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_567_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_566" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_567_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_569" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_568" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_569" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_570" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_569" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_570" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_570_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_569" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_570_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_591" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_570" xlink:to="loc_us-gaap_SeniorNotesMember_591" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_592" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_570" xlink:to="loc_mx_ExchangeableSeniorNotesMember_592" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_815340" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_568" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_815340" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_815341" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_815340" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_815341" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_815341_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_815340" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_815341_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_563" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_568" xlink:to="loc_us-gaap_DebtInstrumentAxis_563" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_563" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_565" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_565_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_563" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_565_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_587" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_565" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_587" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember_586" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_565" xlink:to="loc_mx_SixPointSixTwoFiveZeroPercentageSeniorSecuredNotesDueTwoThousandTwentyOneMember_586" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_580" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_580" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestOnConvertibleDebtNetOfTax" xlink:label="loc_us-gaap_InterestOnConvertibleDebtNetOfTax_722658" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_InterestOnConvertibleDebtNetOfTax_722658" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_311215" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_311215" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_311214" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_311214" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_583" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_583" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="loc_us-gaap_RepaymentsOfDebt_815326" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_RepaymentsOfDebt_815326" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_572" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_572" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_573" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_573" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_579" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_579" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_578" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_578" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_584" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_564" xlink:to="loc_us-gaap_InterestExpenseDebt_584" use="optional" order="31" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BorrowingsComponentsOfLongTermBorrowingsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_535" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_686258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_535" xlink:to="loc_us-gaap_LongTermDebtCurrent_686258" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_537" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_535" xlink:to="loc_us-gaap_DebtInstrumentTable_537" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_538" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_537" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_538" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_539" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_538" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_539" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_539_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_538" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_539_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_545" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_539" xlink:to="loc_mx_ExchangeableSeniorNotesMember_545" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_534" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_537" xlink:to="loc_us-gaap_DebtInstrumentAxis_534" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_536" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_534" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_536" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_536_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_534" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_536_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_543" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_536" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_543" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_540" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_535" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_540" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_541" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_535" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_541" use="optional" order="12" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/BorrowingsComponentsOfLongTermBorrowingsParentheticalDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_550" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_555" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_550" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_555" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_410804" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_550" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_410804" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_552" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_550" xlink:to="loc_us-gaap_DebtInstrumentTable_552" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_549" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_552" xlink:to="loc_us-gaap_DebtInstrumentAxis_549" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_551" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_549" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_551" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_551_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_549" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_551_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_557" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_551" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_557" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_553" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_552" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_553" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_554" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_553" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_554" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_554_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_553" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_554_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_559" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_554" xlink:to="loc_mx_ExchangeableSeniorNotesMember_559" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/AccruedSeveranceBenefitsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_599" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EmployeesEligibleForSeveranceBenefitsPercentage" xlink:label="loc_mx_EmployeesEligibleForSeveranceBenefitsPercentage_604" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_599" xlink:to="loc_mx_EmployeesEligibleForSeveranceBenefitsPercentage_604" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_600" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_599" xlink:to="loc_us-gaap_StatementTable_600" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_600" xlink:to="loc_srt_RangeAxis_595" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_596" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_595" xlink:to="loc_srt_RangeMember_596" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_596_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_595" xlink:to="loc_srt_RangeMember_596_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_602" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_596" xlink:to="loc_srt_MaximumMember_602" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_598" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_600" xlink:to="loc_srt_StatementGeographicalAxis_598" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_597" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_598" xlink:to="loc_srt_SegmentGeographicalDomain_597" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_597_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_598" xlink:to="loc_srt_SegmentGeographicalDomain_597_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_KR" xlink:label="loc_country_KR_603" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_597" xlink:to="loc_country_KR_603" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_KoreasMandatoryRetirementAge" xlink:label="loc_mx_KoreasMandatoryRetirementAge_605" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_599" xlink:to="loc_mx_KoreasMandatoryRetirementAge_605" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_663" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_663" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_664" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_664" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_666" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_666" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_665" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_665" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" xlink:to="loc_srt_RangeAxis_651" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_652" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_651" xlink:to="loc_srt_RangeMember_652" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_652_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_651" xlink:to="loc_srt_RangeMember_652_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" xlink:to="loc_us-gaap_AwardTypeAxis_650" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_650" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_650" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655_default" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_668" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_668" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_669" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_655" xlink:to="loc_us-gaap_EmployeeStockOptionMember_669" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1293848" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1293848" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1293850" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1293848" xlink:to="loc_us-gaap_EquityComponentDomain_1293850" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1293850_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1293848" xlink:to="loc_us-gaap_EquityComponentDomain_1293850_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1293853" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1293850" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1293853" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_1278172" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_653" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_1278172" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_1278173" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_1278172" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_1278173" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_1278173_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_1278172" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_1278173_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AcceleratedStockRepurchaseProgramMember" xlink:label="loc_mx_AcceleratedStockRepurchaseProgramMember_1278174" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_1278173" xlink:to="loc_mx_AcceleratedStockRepurchaseProgramMember_1278174" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_660" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_660" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_662" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_662" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_659" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_659" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_1278156" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_1278156" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_Acceleratedsharerepurchaseprogramadjustmentshares" xlink:label="loc_mx_Acceleratedsharerepurchaseprogramadjustmentshares_1293033" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_mx_Acceleratedsharerepurchaseprogramadjustmentshares_1293033" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcceleratedShareRepurchaseProgramAdjustment" xlink:label="loc_us-gaap_AcceleratedShareRepurchaseProgramAdjustment_1278158" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_AcceleratedShareRepurchaseProgramAdjustment_1278158" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt_1278159" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt_1278159" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_667" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AggregatePurchasePriceOfShares" xlink:label="loc_mx_AggregatePurchasePriceOfShares_1278166" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_mx_AggregatePurchasePriceOfShares_1278166" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare_1293032" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_654" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesInitialPricePaidPerShare_1293032" use="optional" order="31" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/StockholdersEquityAndStockBasedCompensationSummaryOfRestrictedStockUnitActivitiesDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_682" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_682" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_673" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_673" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_672" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_673" xlink:to="loc_us-gaap_AwardTypeAxis_672" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_675" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_672" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_675" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_675_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_672" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_675_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_686" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_675" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_686" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_677" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_677" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_684" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_684" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_676" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_676" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_678" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_678" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_683" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_683" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_679" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_679" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_681" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_674" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_681" use="optional" order="13" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/EarlyTerminationAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_742" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_RegulatoryRequestsNonRecurringProfessionalFeesAndExpenses" xlink:label="loc_mx_RegulatoryRequestsNonRecurringProfessionalFeesAndExpenses_1278182" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_742" xlink:to="loc_mx_RegulatoryRequestsNonRecurringProfessionalFeesAndExpenses_1278182" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_1278185" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_742" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_1278185" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarlyTerminationCharges" xlink:label="loc_mx_EarlyTerminationCharges_1278963" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_742" xlink:to="loc_mx_EarlyTerminationCharges_1278963" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_742" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_741" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_741" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_746" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_741" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_746" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_746_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_741" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_746_default" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarlyTerminationChargesAxis" xlink:label="loc_mx_EarlyTerminationChargesAxis_1278970" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_mx_EarlyTerminationChargesAxis_1278970" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarlyTerminationChargesDomain" xlink:label="loc_mx_EarlyTerminationChargesDomain_1278972" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mx_EarlyTerminationChargesAxis_1278970" xlink:to="loc_mx_EarlyTerminationChargesDomain_1278972" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarlyTerminationChargesDomain" xlink:label="loc_mx_EarlyTerminationChargesDomain_1278972_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mx_EarlyTerminationChargesAxis_1278970" xlink:to="loc_mx_EarlyTerminationChargesDomain_1278972_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OneTimeTerminationBenefitMember" xlink:label="loc_mx_OneTimeTerminationBenefitMember_1278973" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_EarlyTerminationChargesDomain_1278972" xlink:to="loc_mx_OneTimeTerminationBenefitMember_1278973" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_735" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_735" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_736" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_735" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_736" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_736_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_735" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_736_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_745" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_srt_StatementGeographicalAxis_745" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_744" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_745" xlink:to="loc_srt_SegmentGeographicalDomain_744" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_744_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_745" xlink:to="loc_srt_SegmentGeographicalDomain_744_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_737" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_srt_ProductOrServiceAxis_737" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_738" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_737" xlink:to="loc_srt_ProductsAndServicesDomain_738" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_738_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_737" xlink:to="loc_srt_ProductsAndServicesDomain_738_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_739" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_743" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_739" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_740" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_739" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_740" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_740_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_739" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_740_default" use="optional" order="23" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/IncomeTaxesAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_807" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_821" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_821" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_808" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_808" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srt_ConsolidatedEntitiesAxis_800" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_srt_ConsolidatedEntitiesAxis_800" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_801" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_800" xlink:to="loc_srt_ConsolidatedEntitiesDomain_801" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srt_ConsolidatedEntitiesDomain_801_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_800" xlink:to="loc_srt_ConsolidatedEntitiesDomain_801_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SubsidiariesMember" xlink:label="loc_srt_SubsidiariesMember_844766" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_801" xlink:to="loc_srt_SubsidiariesMember_844766" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseAxis" xlink:label="loc_srt_LitigationCaseAxis_810" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_srt_LitigationCaseAxis_810" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_811" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_810" xlink:to="loc_srt_LitigationCaseTypeDomain_811" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_LitigationCaseTypeDomain" xlink:label="loc_srt_LitigationCaseTypeDomain_811_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_810" xlink:to="loc_srt_LitigationCaseTypeDomain_811_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_798" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_798" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_799" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_798" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_799" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_799_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_798" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_799_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_803" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_803" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_804" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_803" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_804" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_804_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_803" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_804_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_805" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_805" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_806" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_805" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_806" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_806_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_805" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_806_default" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_813" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_srt_StatementScenarioAxis_813" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_812" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_813" xlink:to="loc_srt_ScenarioUnspecifiedDomain_812" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_812_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_813" xlink:to="loc_srt_ScenarioUnspecifiedDomain_812_default" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAxis" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_814" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_814" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_815" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_814" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_815" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardNameDomain" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_815_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_814" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_815_default" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DutchStatutoryTaxRateMember" xlink:label="loc_mx_DutchStatutoryTaxRateMember_847" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_815" xlink:to="loc_mx_DutchStatutoryTaxRateMember_847" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_809" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_dei_LegalEntityAxis_809" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_802" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_809" xlink:to="loc_dei_EntityDomain_802" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_802_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_809" xlink:to="loc_dei_EntityDomain_802_default" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LuxembourgSubsidiaryMember" xlink:label="loc_mx_LuxembourgSubsidiaryMember_818" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_802" xlink:to="loc_mx_LuxembourgSubsidiaryMember_818" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_845163" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_845163" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_845164" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_845163" xlink:to="loc_us-gaap_SegmentDomain_845164" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_845164_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_845163" xlink:to="loc_us-gaap_SegmentDomain_845164_default" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodAxis" xlink:label="loc_us-gaap_TaxPeriodAxis_1293882" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_808" xlink:to="loc_us-gaap_TaxPeriodAxis_1293882" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodDomain" xlink:label="loc_us-gaap_TaxPeriodDomain_1293883" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_1293882" xlink:to="loc_us-gaap_TaxPeriodDomain_1293883" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodDomain" xlink:label="loc_us-gaap_TaxPeriodDomain_1293883_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_1293882" xlink:to="loc_us-gaap_TaxPeriodDomain_1293883_default" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TaxPeriodTwoThousandAndFourtyMember" xlink:label="loc_mx_TaxPeriodTwoThousandAndFourtyMember_1293896" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_1293883" xlink:to="loc_mx_TaxPeriodTwoThousandAndFourtyMember_1293896" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IndefiniteTaxPeriodMember" xlink:label="loc_mx_IndefiniteTaxPeriodMember_1293884" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_1293883" xlink:to="loc_mx_IndefiniteTaxPeriodMember_1293884" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TaxPeriodTwoThousandAndThirtyFourThroughTwoThousandAndThirtySevenMember" xlink:label="loc_mx_TaxPeriodTwoThousandAndThirtyFourThroughTwoThousandAndThirtySevenMember_1293886" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_1293883" xlink:to="loc_mx_TaxPeriodTwoThousandAndThirtyFourThroughTwoThousandAndThirtySevenMember_1293886" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TaxPeriodTwoThousandTwentySixMember" xlink:label="loc_mx_TaxPeriodTwoThousandTwentySixMember_1293887" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_1293883" xlink:to="loc_mx_TaxPeriodTwoThousandTwentySixMember_1293887" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_NetOperatingLossCarryForwardsExpirationDate" xlink:label="loc_mx_NetOperatingLossCarryForwardsExpirationDate_835" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_NetOperatingLossCarryForwardsExpirationDate_835" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_830" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_830" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_839" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_839" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesExpense" xlink:label="loc_us-gaap_IncomeTaxExaminationPenaltiesExpense_840" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_IncomeTaxExaminationPenaltiesExpense_840" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OperatingLossCarryforwardsUtilizedDuringPeriod" xlink:label="loc_mx_OperatingLossCarryforwardsUtilizedDuringPeriod_832" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_OperatingLossCarryforwardsUtilizedDuringPeriod_832" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_831" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_OperatingLossCarryforwards_831" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_833" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_833" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxRateReconciliationChangeInValuationAllowance" xlink:label="loc_mx_IncomeTaxRateReconciliationChangeInValuationAllowance_311218" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_IncomeTaxRateReconciliationChangeInValuationAllowance_311218" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EffectiveIncomeTaxRateReconciliationPermanentAdjustmentsAmount" xlink:label="loc_mx_EffectiveIncomeTaxRateReconciliationPermanentAdjustmentsAmount_815005" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_EffectiveIncomeTaxRateReconciliationPermanentAdjustmentsAmount_815005" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxReconciliationUnrealizedForeignExchangeTranslationLoss" xlink:label="loc_mx_IncomeTaxReconciliationUnrealizedForeignExchangeTranslationLoss_815010" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_IncomeTaxReconciliationUnrealizedForeignExchangeTranslationLoss_815010" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_818763" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_818763" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxExpenseWaiverAmount" xlink:label="loc_mx_IncomeTaxExpenseWaiverAmount_844765" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_IncomeTaxExpenseWaiverAmount_844765" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_326489" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_326489" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_845131" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_845131" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxIncrementalTaxSavings" xlink:label="loc_mx_IncomeTaxIncrementalTaxSavings_845135" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_IncomeTaxIncrementalTaxSavings_845135" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OperatingLossCarryforwardsExpirationRange" xlink:label="loc_mx_OperatingLossCarryforwardsExpirationRange_834" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_OperatingLossCarryforwardsExpirationRange_834" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_837" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_837" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StateNetOperatingLossWriteOff" xlink:label="loc_mx_StateNetOperatingLossWriteOff_1301940" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_StateNetOperatingLossWriteOff_1301940" use="optional" order="57" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ReleaseOfValuationAllowancesRelatedEarnings" xlink:label="loc_mx_ReleaseOfValuationAllowancesRelatedEarnings_1301942" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_ReleaseOfValuationAllowancesRelatedEarnings_1301942" use="optional" order="58" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ReleaseOfValuationAllowancesBasedOnTheRealizability" xlink:label="loc_mx_ReleaseOfValuationAllowancesBasedOnTheRealizability_849353" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_ReleaseOfValuationAllowancesBasedOnTheRealizability_849353" use="optional" order="59" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_IncomeTaxBenefitAttributableToChangeInValuationAllowances" xlink:label="loc_mx_IncomeTaxBenefitAttributableToChangeInValuationAllowances_1293804" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_IncomeTaxBenefitAttributableToChangeInValuationAllowances_1293804" use="optional" order="60" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OperatingLossCarryforwardRetainedByUsParentAndSubsidiary" xlink:label="loc_mx_OperatingLossCarryforwardRetainedByUsParentAndSubsidiary_1293892" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_807" xlink:to="loc_mx_OperatingLossCarryforwardRetainedByUsParentAndSubsidiary_1293892" use="optional" order="61" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseBenefitAttributableToIncomeLossFromContinuingOperationsDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_782" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_787" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_787" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet" xlink:label="loc_mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet_786" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" xlink:to="loc_mx_LiabilityForIncomeTaxesAssociatedWithUncertainTaxPositionsNet_786" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_784" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_784" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_785" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_777" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_785" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract_779" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract_779" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_791" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract_779" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_791" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_792" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract_779" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_792" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_790" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract_779" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_790" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_795" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_795" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_789" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_789" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation_844979" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation_844979" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxContingencyTable" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_783" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_783" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_780" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_783" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_780" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_781" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_780" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_781" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_781_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_780" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_781_default" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaap_DomesticCountryMember_793" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_781" xlink:to="loc_us-gaap_DomesticCountryMember_793" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="loc_us-gaap_ForeignCountryMember_794" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_781" xlink:to="loc_us-gaap_ForeignCountryMember_794" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_778" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_782" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_778" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_788" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_778" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_788" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_845563" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_778" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_845563" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_844750" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_778" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_844750" use="optional" order="22" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/GeographicAndOtherInformationAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_936" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_936" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_931" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_931" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_931" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_931" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaap_SalesRevenueNetMember_942" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930" xlink:to="loc_us-gaap_SalesRevenueNetMember_942" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentMember" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentMember_943" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentMember_943" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaap_AccountsReceivableMember_722066" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_930" xlink:to="loc_us-gaap_AccountsReceivableMember_722066" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_932" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_932" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_933" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_932" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_933" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_933_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_932" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_933_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_944" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_933" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_944" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicConcentrationRiskMember" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_945" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_933" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_945" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_689379" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_689379" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_689380" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_689379" xlink:to="loc_us-gaap_SegmentDomain_689380" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_689380_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_689379" xlink:to="loc_us-gaap_SegmentDomain_689380_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardProductsBusinessMember" xlink:label="loc_mx_StandardProductsBusinessMember_689381" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_689380" xlink:to="loc_mx_StandardProductsBusinessMember_689381" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_940" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_srt_StatementGeographicalAxis_940" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_939" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_940" xlink:to="loc_srt_SegmentGeographicalDomain_939" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_939_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_940" xlink:to="loc_srt_SegmentGeographicalDomain_939_default" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_KR" xlink:label="loc_country_KR_954" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_939" xlink:to="loc_country_KR_954" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AsiaPacificOtherThanKoreaMember" xlink:label="loc_mx_AsiaPacificOtherThanKoreaMember_311183" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_939" xlink:to="loc_mx_AsiaPacificOtherThanKoreaMember_311183" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_CN" xlink:label="loc_country_CN_311195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_939" xlink:to="loc_country_CN_311195" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_VN" xlink:label="loc_country_VN_844771" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_939" xlink:to="loc_country_VN_844771" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_941" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_srt_RestatementAxis_941" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_937" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_941" xlink:to="loc_srt_RestatementDomain_937" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_937_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_941" xlink:to="loc_srt_RestatementDomain_937_default" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_311199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_srt_ConsolidationItemsAxis_311199" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_311200" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_311199" xlink:to="loc_srt_ConsolidationItemsDomain_311200" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_311200_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_311199" xlink:to="loc_srt_ConsolidationItemsDomain_311200_default" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis" xlink:label="loc_srt_MajorCustomersAxis_934" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_938" xlink:to="loc_srt_MajorCustomersAxis_934" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_935" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_934" xlink:to="loc_srt_NameOfMajorCustomerDomain_935" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_935_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_934" xlink:to="loc_srt_NameOfMajorCustomerDomain_935_default" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TopCustomerOneMember" xlink:label="loc_mx_TopCustomerOneMember_947" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_935" xlink:to="loc_mx_TopCustomerOneMember_947" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TopCustomerTwoMember" xlink:label="loc_mx_TopCustomerTwoMember_948" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_935" xlink:to="loc_mx_TopCustomerTwoMember_948" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_TopTenCustomersMember" xlink:label="loc_mx_TopTenCustomersMember_946" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_935" xlink:to="loc_mx_TopTenCustomersMember_946" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_950" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_936" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_950" use="optional" order="36" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/GeographicAndOtherInformationScheduleOfOperatingSegmentDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_963" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_972" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_963" xlink:to="loc_us-gaap_GrossProfit_972" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_971" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_963" xlink:to="loc_us-gaap_Revenues_971" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_961" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_963" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_961" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_957" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_961" xlink:to="loc_srt_ConsolidationItemsAxis_957" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_958" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_957" xlink:to="loc_srt_ConsolidationItemsDomain_958" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_958_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_957" xlink:to="loc_srt_ConsolidationItemsDomain_958_default" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_965" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_958" xlink:to="loc_us-gaap_OperatingSegmentsMember_965" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_964" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_961" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_964" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_962" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_964" xlink:to="loc_us-gaap_SegmentDomain_962" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_962_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_964" xlink:to="loc_us-gaap_SegmentDomain_962_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FabThreeFoundryServicesMember" xlink:label="loc_mx_FabThreeFoundryServicesMember_685946" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_962" xlink:to="loc_mx_FabThreeFoundryServicesMember_685946" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardProductsBusinessMember" xlink:label="loc_mx_StandardProductsBusinessMember_970" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_962" xlink:to="loc_mx_StandardProductsBusinessMember_970" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_959" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_961" xlink:to="loc_srt_ProductOrServiceAxis_959" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_960" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_959" xlink:to="loc_srt_ProductsAndServicesDomain_960" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_960_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_959" xlink:to="loc_srt_ProductsAndServicesDomain_960_default" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_PowerSolutionsMember" xlink:label="loc_mx_PowerSolutionsMember_968" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_960" xlink:to="loc_mx_PowerSolutionsMember_968" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DisplaySolutionsMember" xlink:label="loc_mx_DisplaySolutionsMember_967" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_960" xlink:to="loc_mx_DisplaySolutionsMember_967" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/GeographicAndOtherInformationNetSalesByRegionBasedOnLocationOfProductsAreBilledDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_975" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_979" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_975" xlink:to="loc_us-gaap_Revenues_979" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_976" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_975" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_976" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_978" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_976" xlink:to="loc_srt_StatementGeographicalAxis_978" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_977" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_978" xlink:to="loc_srt_SegmentGeographicalDomain_977" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_977_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_978" xlink:to="loc_srt_SegmentGeographicalDomain_977_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US" xlink:label="loc_country_US_982" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_977" xlink:to="loc_country_US_982" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AsiaPacificOtherThanKoreaMember" xlink:label="loc_mx_AsiaPacificOtherThanKoreaMember_981" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_977" xlink:to="loc_mx_AsiaPacificOtherThanKoreaMember_981" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EuropeMember" xlink:label="loc_srt_EuropeMember_983" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_977" xlink:to="loc_srt_EuropeMember_983" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_KR" xlink:label="loc_country_KR_980" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_977" xlink:to="loc_country_KR_980" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OtherCountriesMember" xlink:label="loc_mx_OtherCountriesMember_984" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_977" xlink:to="loc_mx_OtherCountriesMember_984" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_689467" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_976" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_689467" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_689468" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_689467" xlink:to="loc_us-gaap_SegmentDomain_689468" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_689468_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_689467" xlink:to="loc_us-gaap_SegmentDomain_689468_default" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardProductsBusinessMember" xlink:label="loc_mx_StandardProductsBusinessMember_689469" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_689468" xlink:to="loc_mx_StandardProductsBusinessMember_689469" use="optional" order="14" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/AccumulatedOtherComprehensiveIncomeLossChangesInAccumulatedOtherComprehensiveIncomeLossDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1046" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1046" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1048" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1046" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1048" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1047" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1048" xlink:to="loc_us-gaap_EquityComponentDomain_1047" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1047_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1048" xlink:to="loc_us-gaap_EquityComponentDomain_1047_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_1054" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1047" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_1054" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1056" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1047" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_1056" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_1055" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1047" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_1055" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_1050" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_1050" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_1051" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_1051" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_1049" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" xlink:to="loc_us-gaap_StockholdersEquity_1049" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_1052" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_1045" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_1052" use="optional" order="11" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/EarningsLossPerShareAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_310479" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_1279011" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_1279011" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockVotingRights" xlink:label="loc_us-gaap_CommonStockVotingRights_1279014" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_CommonStockVotingRights_1279014" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_RedemptionOfRightsPerRight" xlink:label="loc_mx_RedemptionOfRightsPerRight_1279013" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_mx_RedemptionOfRightsPerRight_1279013" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_PercentageOfAssetsOrEarningPowerOfTheCompany" xlink:label="loc_mx_PercentageOfAssetsOrEarningPowerOfTheCompany_1279015" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_mx_PercentageOfAssetsOrEarningPowerOfTheCompany_1279015" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_1278996" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_1278996" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_1279001" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_SharesIssuedPricePerShare_1279001" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_310476" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_StatementTable_310476" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_327013" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310476" xlink:to="loc_us-gaap_StatementClassOfStockAxis_327013" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_327014" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_327013" xlink:to="loc_us-gaap_ClassOfStockDomain_327014" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_327014_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_327013" xlink:to="loc_us-gaap_ClassOfStockDomain_327014_default" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_Seriesa1Member" xlink:label="loc_mx_Seriesa1Member_1279000" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_327014" xlink:to="loc_mx_Seriesa1Member_1279000" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_1279005" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310476" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_1279005" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1279005" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_1279005" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006_default" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_PassiveInstitutionalInvestorMember" xlink:label="loc_mx_PassiveInstitutionalInvestorMember_1279008" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006" xlink:to="loc_mx_PassiveInstitutionalInvestorMember_1279008" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_AcquiringPersonMember" xlink:label="loc_mx_AcquiringPersonMember_1279007" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1279006" xlink:to="loc_mx_AcquiringPersonMember_1279007" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_310472" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310479" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_310472" use="optional" order="17" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/EarningsLossPerShareScheduleOfComputationOfBasicAndDilutedLossPerCommonShareParentheticalDetail">
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarningsPerShareLineItems" xlink:label="loc_mx_EarningsPerShareLineItems_1073" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EarningsPerShareTable" xlink:label="loc_mx_EarningsPerShareTable_1074" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_mx_EarningsPerShareLineItems_1073" xlink:to="loc_mx_EarningsPerShareTable_1074" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1075" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_EarningsPerShareTable_1074" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1075" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1076" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1075" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1076" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1076_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1075" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1076_default" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ExchangeableSeniorNotesMember" xlink:label="loc_mx_ExchangeableSeniorNotesMember_1079" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1076" xlink:to="loc_mx_ExchangeableSeniorNotesMember_1079" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_1071" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_mx_EarningsPerShareTable_1074" xlink:to="loc_us-gaap_DebtInstrumentAxis_1071" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1072" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1071" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1072" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1072_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1071" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1072_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember" xlink:label="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_1077" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1072" xlink:to="loc_mx_FivePointZeroPercentageExchangeableSeniorNotesDueTwoThousandTwentyOneMember_1077" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_1078" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mx_EarningsPerShareLineItems_1073" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_1078" use="optional" order="10" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/EarningsLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromTheComputationOfLossPerCommonShareDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1083" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1086" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1083" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_1086" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_1085" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1083" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_1085" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1082" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_1085" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1082" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1082" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1082" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_EmployeeAndNonEmployeeStockOptionMember" xlink:label="loc_mx_EmployeeAndNonEmployeeStockOptionMember_1087" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084" xlink:to="loc_mx_EmployeeAndNonEmployeeStockOptionMember_1087" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_1088" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1084" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_1088" use="optional" order="7" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/MergerAgreementAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_1292815" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_DeferredMergerTerminationFeeAsOtherReceivable" xlink:label="loc_mx_DeferredMergerTerminationFeeAsOtherReceivable_1301967" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_mx_DeferredMergerTerminationFeeAsOtherReceivable_1301967" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MergerRelatedExpenses" xlink:label="loc_mx_MergerRelatedExpenses_1292820" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_mx_MergerRelatedExpenses_1292820" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_ProceedFromMergerTermination" xlink:label="loc_mx_ProceedFromMergerTermination_1292816" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_mx_ProceedFromMergerTermination_1292816" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_MergerTerminationFee" xlink:label="loc_mx_MergerTerminationFee_1292818" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_mx_MergerTerminationFee_1292818" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_1292812" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_us-gaap_StatementTable_1292812" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_1292821" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1292812" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_1292821" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_1292822" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1292821" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_1292822" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_1292822_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_1292821" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_1292822_default" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_OtherReceivableMember" xlink:label="loc_mx_OtherReceivableMember_1292823" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_1292822" xlink:to="loc_mx_OtherReceivableMember_1292823" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_SecuresDeferredMergerTerminationFee" xlink:label="loc_mx_SecuresDeferredMergerTerminationFee_1292817" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1292815" xlink:to="loc_mx_SecuresDeferredMergerTerminationFee_1292817" use="optional" order="10" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.magnachip.com/role/SubsequentEventsAdditionalInformationDetail">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_310385" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeNotionalAmount" xlink:label="loc_us-gaap_DerivativeNotionalAmount_718935" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_310385" xlink:to="loc_us-gaap_DerivativeNotionalAmount_718935" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_310382" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_310385" xlink:to="loc_us-gaap_StatementTable_310382" xbrldt:contextElement="segment" xbrldt:closed="true" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_310454" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_310454" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_310455" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_310454" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_310455" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_310455_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_310454" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_310455_default" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_310457" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_310455" xlink:to="loc_us-gaap_SubsequentEventMember_310457" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_310383" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_StatementClassOfStockAxis_310383" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_310384" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_310383" xlink:to="loc_us-gaap_ClassOfStockDomain_310384" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_310384_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_310383" xlink:to="loc_us-gaap_ClassOfStockDomain_310384_default" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CounterpartyNameAxis" xlink:label="loc_srt_CounterpartyNameAxis_410814" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_srt_CounterpartyNameAxis_410814" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_410814" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_410814" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815_default" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_NomuraFinancialInvestmentCoLtdMember" xlink:label="loc_mx_NomuraFinancialInvestmentCoLtdMember_410816" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815" xlink:to="loc_mx_NomuraFinancialInvestmentCoLtdMember_410816" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="mx-20211231.xsd#mx_StandardCharteredBankKoreaLimitedMember" xlink:label="loc_mx_StandardCharteredBankKoreaLimitedMember_1278271" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_410815" xlink:to="loc_mx_StandardCharteredBankKoreaLimitedMember_1278271" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_764681" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_764681" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_764682" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_764681" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_764682" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_764682_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_764681" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_764682_default" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_310391" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_DebtInstrumentAxis_310391" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_310392" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_310391" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_310392" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_310392_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_310391" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_310392_default" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_722136" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_722136" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_722137" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_722136" xlink:to="loc_us-gaap_LossContingencyNatureDomain_722137" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_722137_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_722136" xlink:to="loc_us-gaap_LossContingencyNatureDomain_722137_default" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_326521" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_310382" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_326521" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_326523" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_326521" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_326523" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_326523_default" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_326521" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_326523_default" use="optional" order="26" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists">
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" />
<loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent" order="1.0" />
</definitionLink>
</linkbase>
