

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.amkor.com/role/AccruedExpenses" xlink:href="amkr-20170331.xsd#AccruedExpenses" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/AccruedExpensesDetails" xlink:href="amkr-20170331.xsd#AccruedExpensesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/AccruedExpensesTables" xlink:href="amkr-20170331.xsd#AccruedExpensesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/Acquisition" xlink:href="amkr-20170331.xsd#Acquisition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/AcquisitionNarrativeDetails" xlink:href="amkr-20170331.xsd#AcquisitionNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/CommitmentsAndContingencies" xlink:href="amkr-20170331.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/CommitmentsAndContingenciesDetails" xlink:href="amkr-20170331.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:href="amkr-20170331.xsd#CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:href="amkr-20170331.xsd#ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:href="amkr-20170331.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:href="amkr-20170331.xsd#ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:href="amkr-20170331.xsd#ConsolidatedStatementsOfIncomeUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/Debt" xlink:href="amkr-20170331.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/DebtNarrativeDetails" xlink:href="amkr-20170331.xsd#DebtNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/DebtShortTermBorrowingsAndLongTermDebtDetails" xlink:href="amkr-20170331.xsd#DebtShortTermBorrowingsAndLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/DebtTables" xlink:href="amkr-20170331.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/DocumentAndEntityInformationDocumentAndEntityInformation" xlink:href="amkr-20170331.xsd#DocumentAndEntityInformationDocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EarningsPerShare" xlink:href="amkr-20170331.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EarningsPerShareAntidilutiveDetails" xlink:href="amkr-20170331.xsd#EarningsPerShareAntidilutiveDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EarningsPerShareDetails" xlink:href="amkr-20170331.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EarningsPerShareTables" xlink:href="amkr-20170331.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLoss" xlink:href="amkr-20170331.xsd#EquityAndAccumulatedOtherComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossAccumulatedOtherComprehensiveIncomeDetails" xlink:href="amkr-20170331.xsd#EquityAndAccumulatedOtherComprehensiveIncomeLossAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossDetails" xlink:href="amkr-20170331.xsd#EquityAndAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossTables" xlink:href="amkr-20170331.xsd#EquityAndAccumulatedOtherComprehensiveIncomeLossTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FactoringOfAccountsReceivable" xlink:href="amkr-20170331.xsd#FactoringOfAccountsReceivable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FactoringOfAccountsReceivableNarrativeDetails" xlink:href="amkr-20170331.xsd#FactoringOfAccountsReceivableNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FairValueMeasurements" xlink:href="amkr-20170331.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FairValueMeasurementsFairValueOfDebtDetails" xlink:href="amkr-20170331.xsd#FairValueMeasurementsFairValueOfDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FairValueMeasurementsRecurringFairValueMeasurementsDetails" xlink:href="amkr-20170331.xsd#FairValueMeasurementsRecurringFairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/FairValueMeasurementsTables" xlink:href="amkr-20170331.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/IncomeTaxes" xlink:href="amkr-20170331.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/IncomeTaxesNarrativeDetails" xlink:href="amkr-20170331.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/InterimFinancialStatements" xlink:href="amkr-20170331.xsd#InterimFinancialStatements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/InterimFinancialStatementsPolicies" xlink:href="amkr-20170331.xsd#InterimFinancialStatementsPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/Inventories" xlink:href="amkr-20170331.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/InventoriesDetails" xlink:href="amkr-20170331.xsd#InventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/InventoriesTables" xlink:href="amkr-20170331.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/NewAccountingStandards" xlink:href="amkr-20170331.xsd#NewAccountingStandards" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/OtherIncomeAndExpense" xlink:href="amkr-20170331.xsd#OtherIncomeAndExpense" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/OtherIncomeAndExpenseDetails" xlink:href="amkr-20170331.xsd#OtherIncomeAndExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/OtherIncomeAndExpenseTables" xlink:href="amkr-20170331.xsd#OtherIncomeAndExpenseTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PensionPlans" xlink:href="amkr-20170331.xsd#PensionPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PensionPlansForeignDefinedBenefitPensionPlansDetails" xlink:href="amkr-20170331.xsd#PensionPlansForeignDefinedBenefitPensionPlansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PensionPlansNarrativeDetails" xlink:href="amkr-20170331.xsd#PensionPlansNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PensionPlansTables" xlink:href="amkr-20170331.xsd#PensionPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PropertyPlantAndEquipment" xlink:href="amkr-20170331.xsd#PropertyPlantAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PropertyPlantAndEquipmentDetails" xlink:href="amkr-20170331.xsd#PropertyPlantAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PropertyPlantAndEquipmentNarrativeDetails" xlink:href="amkr-20170331.xsd#PropertyPlantAndEquipmentNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/PropertyPlantAndEquipmentTables" xlink:href="amkr-20170331.xsd#PropertyPlantAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlans" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansCompensationExpenseDetails" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansCompensationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansNarrativeDetails" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansRestrictedSharesDetails" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansRestrictedSharesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansStockOptionsDetails" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansStockOptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansTables" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.amkor.com/role/ShareBasedCompensationPlansWeightedAverageFairValueDetails" xlink:href="amkr-20170331.xsd#ShareBasedCompensationPlansWeightedAverageFairValueDetails" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/AccruedExpenses" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/AccruedExpensesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/AccruedExpensesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/Acquisition" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/AcquisitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_75C3FA031917B93560C3C5AAE57277F2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_20149BD7D34D83887448C5AAE5728DA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_75C3FA031917B93560C3C5AAE57277F2" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_20149BD7D34D83887448C5AAE5728DA6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_62E746E61803377B25C3C5AAE57207A5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_20149BD7D34D83887448C5AAE5728DA6" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_62E746E61803377B25C3C5AAE57207A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE3DE147621DD675B8C3C5AAE5720A3D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_62E746E61803377B25C3C5AAE57207A5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE3DE147621DD675B8C3C5AAE5720A3D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE3DE147621DD675B8C3C5AAE5720A3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_62E746E61803377B25C3C5AAE57207A5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE3DE147621DD675B8C3C5AAE5720A3D" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_NaniumS.A.Member" xlink:label="loc_amkr_NaniumS.A.Member_01DBAFA97E0B20CC0BE0C5AAE572F7C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_DE3DE147621DD675B8C3C5AAE5720A3D" xlink:to="loc_amkr_NaniumS.A.Member_01DBAFA97E0B20CC0BE0C5AAE572F7C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_A0BEBAE023B2FD3F268EC5AAE5722678" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_75C3FA031917B93560C3C5AAE57277F2" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_A0BEBAE023B2FD3F268EC5AAE5722678" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_B46A7E843B3966F1A549C5DB35458A4D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_B4C0EA4018E8B75E2346C5DB353FE2F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_B46A7E843B3966F1A549C5DB35458A4D" xlink:to="loc_us-gaap_LossContingenciesTable_B4C0EA4018E8B75E2346C5DB353FE2F3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_0D8863750B4385123EF8C5DB353F4AB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B4C0EA4018E8B75E2346C5DB353FE2F3" xlink:to="loc_us-gaap_DebtInstrumentAxis_0D8863750B4385123EF8C5DB353F4AB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4113ADFD4EDF1BFA0837C5DB353FAB3B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_0D8863750B4385123EF8C5DB353F4AB3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4113ADFD4EDF1BFA0837C5DB353FAB3B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4113ADFD4EDF1BFA0837C5DB353FAB3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_0D8863750B4385123EF8C5DB353F4AB3" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4113ADFD4EDF1BFA0837C5DB353FAB3B" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member" xlink:label="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_FB71EBE1F7AAF6264A21C5DB353F857D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4113ADFD4EDF1BFA0837C5DB353FAB3B" xlink:to="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_FB71EBE1F7AAF6264A21C5DB353F857D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_B4F79E59243492BA4D47C5DB353F7BB0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B4C0EA4018E8B75E2346C5DB353FE2F3" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_B4F79E59243492BA4D47C5DB353F7BB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1A093F6E92AB40247B4CC5DB3540FEA4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B4F79E59243492BA4D47C5DB353F7BB0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1A093F6E92AB40247B4CC5DB3540FEA4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1A093F6E92AB40247B4CC5DB3540FEA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B4F79E59243492BA4D47C5DB353F7BB0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1A093F6E92AB40247B4CC5DB3540FEA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_BAB3CEF18635DA59C6DDC5DB35401CD5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1A093F6E92AB40247B4CC5DB3540FEA4" xlink:to="loc_us-gaap_LineOfCreditMember_BAB3CEF18635DA59C6DDC5DB35401CD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_B0E53712BD3BA7132D44C5DB3540E66D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B4C0EA4018E8B75E2346C5DB353FE2F3" xlink:to="loc_us-gaap_CreditFacilityAxis_B0E53712BD3BA7132D44C5DB3540E66D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_B0E53712BD3BA7132D44C5DB3540E66D" xlink:to="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_B0E53712BD3BA7132D44C5DB3540E66D" xlink:to="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_38DD6C5FBD08C794EF7EC5DB3545D48D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210" xlink:to="loc_us-gaap_LetterOfCreditMember_38DD6C5FBD08C794EF7EC5DB3545D48D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_6EEB29BB40EB6431008CC5DB354523C2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_B650D80E382F8876A0ECC5DB35458210" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_6EEB29BB40EB6431008CC5DB354523C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D42309025A76B552C4CEC5DB35459AF0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_B46A7E843B3966F1A549C5DB35458A4D" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_D42309025A76B552C4CEC5DB35459AF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_4CC4576E9271D19A9C80C5DB35454C86" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_B46A7E843B3966F1A549C5DB35458A4D" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_4CC4576E9271D19A9C80C5DB35454C86" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ConsolidatedStatementsOfIncomeUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/Debt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_9F1CD006881667B5E05ED4697EB692E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_9F1CD006881667B5E05ED4697EB692E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_9DAAD36607D252635F90D4697EB60557_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_9F1CD006881667B5E05ED4697EB692E9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_9DAAD36607D252635F90D4697EB60557_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_9DAAD36607D252635F90D4697EB60557" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_9F1CD006881667B5E05ED4697EB692E9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_9DAAD36607D252635F90D4697EB60557" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_FC3B0A0E3E8FD1779DC1D4697EB6122B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_9DAAD36607D252635F90D4697EB60557" xlink:to="loc_us-gaap_SubsequentEventMember_FC3B0A0E3E8FD1779DC1D4697EB6122B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_1FAB4BDB7C5B75453BB6D4697EB69A79" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_VariableRateAxis_1FAB4BDB7C5B75453BB6D4697EB69A79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_1FAB4BDB7C5B75453BB6D4697EB69A79" xlink:to="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_1FAB4BDB7C5B75453BB6D4697EB69A79" xlink:to="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TokyoInterbankOfferedRateTIBORMember" xlink:label="loc_amkr_TokyoInterbankOfferedRateTIBORMember_93F7411BA182AFACDE76D4697EB7BAD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D" xlink:to="loc_amkr_TokyoInterbankOfferedRateTIBORMember_93F7411BA182AFACDE76D4697EB7BAD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_FF1C125C6062353106E2D4697EB7C0EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_528D056AC58680912278D4697EB6EA7D" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_FF1C125C6062353106E2D4697EB7C0EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_821C0F019762BEC0DE39D4697EB7C01B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_RangeAxis_821C0F019762BEC0DE39D4697EB7C01B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_821C0F019762BEC0DE39D4697EB7C01B" xlink:to="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_821C0F019762BEC0DE39D4697EB7C01B" xlink:to="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_F01FA7371A40A1EAB560D4697EB731E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2" xlink:to="loc_us-gaap_MinimumMember_F01FA7371A40A1EAB560D4697EB731E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_1421BC41A05767237F18D4697EB75193" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2" xlink:to="loc_us-gaap_MaximumMember_1421BC41A05767237F18D4697EB75193" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WeightedAverageMember" xlink:label="loc_us-gaap_WeightedAverageMember_87D5D661EC865E4B5557D4697EB7E24F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_70656A5D83754F4A2D69D4697EB7C4F2" xlink:to="loc_us-gaap_WeightedAverageMember_87D5D661EC865E4B5557D4697EB7E24F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_F250F918B421191671F0D4697EB7BD37" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_CreditFacilityAxis_F250F918B421191671F0D4697EB7BD37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_F250F918B421191671F0D4697EB7BD37" xlink:to="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_F250F918B421191671F0D4697EB7BD37" xlink:to="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_69B52520738183FEA76DD4697EB7BD7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_69B52520738183FEA76DD4697EB7BD7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_0F4DB99766CD81C6094FD4697EB73DE4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_EA71F2551296C0EE911AD4697EB79FA9" xlink:to="loc_us-gaap_LetterOfCreditMember_0F4DB99766CD81C6094FD4697EB73DE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_D8ED6C5404FABA5447F3D4697EB71843" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_D8ED6C5404FABA5447F3D4697EB71843" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_D8ED6C5404FABA5447F3D4697EB71843" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_D8ED6C5404FABA5447F3D4697EB71843" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_13B6CFF4E1C2E63F73DED4697EB78141" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E" xlink:to="loc_us-gaap_LineOfCreditMember_13B6CFF4E1C2E63F73DED4697EB78141" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SubsidiaryTermLoansMember" xlink:label="loc_amkr_SubsidiaryTermLoansMember_D68C09BBC9A8E7839265D4697EB89DAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E" xlink:to="loc_amkr_SubsidiaryTermLoansMember_D68C09BBC9A8E7839265D4697EB89DAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_AADEDD8D81EBFA5022B7D4697EB8E671" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_450736F103A788EE3C0CD4697EB7572E" xlink:to="loc_us-gaap_SeniorNotesMember_AADEDD8D81EBFA5022B7D4697EB8E671" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_C2789F82A841AC6B12FFD4697EB8CE18" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_StatementGeographicalAxis_C2789F82A841AC6B12FFD4697EB8CE18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_C2789F82A841AC6B12FFD4697EB8CE18" xlink:to="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_C2789F82A841AC6B12FFD4697EB8CE18" xlink:to="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_KR" xlink:label="loc_country_KR_A7696BEB50872BCF5F30D4697EB8DE08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:to="loc_country_KR_A7696BEB50872BCF5F30D4697EB8DE08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_JP" xlink:label="loc_country_JP_85AD09203590AAFC977DD4697EB8B6C6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:to="loc_country_JP_85AD09203590AAFC977DD4697EB8B6C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_TW" xlink:label="loc_country_TW_424724CED7E34CAB36F9D4697EB8F7F4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:to="loc_country_TW_424724CED7E34CAB36F9D4697EB8F7F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_CN" xlink:label="loc_country_CN_ECFA11F9B8AC1ECD1504D4697EB87279" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_9143038772D19037E7F3D4697EB88B3C" xlink:to="loc_country_CN_ECFA11F9B8AC1ECD1504D4697EB87279" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_894F03551604B190932CD4697EB8C420" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A59EA4CF5A69AE8C6BEBD4697EB69A75" xlink:to="loc_us-gaap_DebtInstrumentAxis_894F03551604B190932CD4697EB8C420" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_894F03551604B190932CD4697EB8C420" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_894F03551604B190932CD4697EB8C420" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member" xlink:label="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_5A677CE3C5643914B081D4697EB86DC9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_5A677CE3C5643914B081D4697EB86DC9" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorNotesDueJune2021Member" xlink:label="loc_amkr_SeniorNotesDueJune2021Member_EEEEAB65894EEC863501D4697EB84197" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_SeniorNotesDueJune2021Member_EEEEAB65894EEC863501D4697EB84197" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorNotesDueOctober2022Member" xlink:label="loc_amkr_SeniorNotesDueOctober2022Member_C0ACEF5F232D1B4F3F18D4697EB8DFF6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_SeniorNotesDueOctober2022Member_C0ACEF5F232D1B4F3F18D4697EB8DFF6" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_RevolvingcreditfacilitydueJune2017Member" xlink:label="loc_amkr_RevolvingcreditfacilitydueJune2017Member_4F242B84A3B7E61A9588D4697EB84C0B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_RevolvingcreditfacilitydueJune2017Member_4F242B84A3B7E61A9588D4697EB84C0B" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay2018Member" xlink:label="loc_amkr_TermLoanDueMay2018Member_4942B4A600A77533CD2FD4697EB8D562" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanDueMay2018Member_4942B4A600A77533CD2FD4697EB8D562" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueDecember2019Member" xlink:label="loc_amkr_TermLoanDueDecember2019Member_C672A7FA9DAA13E47254D4697EB96ECA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanDueDecember2019Member_C672A7FA9DAA13E47254D4697EB96ECA" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay2020150MMember" xlink:label="loc_amkr_TermLoanDueMay2020150MMember_BE04BEA87424EE29DDB5D4697EB9401C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanDueMay2020150MMember_BE04BEA87424EE29DDB5D4697EB9401C" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay202080MMember" xlink:label="loc_amkr_TermLoanDueMay202080MMember_9EC005331CF0D04B268BD4697EB96D5A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanDueMay202080MMember_9EC005331CF0D04B268BD4697EB96D5A" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueJune2020Member" xlink:label="loc_amkr_TermLoanDueJune2020Member_28211DEC78C3B0475344D4697EB92931" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanDueJune2020Member_28211DEC78C3B0475344D4697EB92931" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_ShorttermtermloanvariablerateMember" xlink:label="loc_amkr_ShorttermtermloanvariablerateMember_D00F7C31AC1D20F35423D4697EB96312" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_ShorttermtermloanvariablerateMember_D00F7C31AC1D20F35423D4697EB96312" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoansDueApril2018Member" xlink:label="loc_amkr_TermLoansDueApril2018Member_DA63E3D6E44E34B01B74D4697EB9601C" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoansDueApril2018Member_DA63E3D6E44E34B01B74D4697EB9601C" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_RevolvingcreditfacilitydueNovember2020Member" xlink:label="loc_amkr_RevolvingcreditfacilitydueNovember2020Member_450D29189558E4CEB050D4697EB9C64D" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_RevolvingcreditfacilitydueNovember2020Member_450D29189558E4CEB050D4697EB9C64D" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanLIBORplus1.80dueDecember2019Member" xlink:label="loc_amkr_TermLoanLIBORplus1.80dueDecember2019Member_BEAEC9DD14504BC69CA3D4697EB939CD" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_B53DB6306F74DF567561D4697EB8AD21" xlink:to="loc_amkr_TermLoanLIBORplus1.80dueDecember2019Member_BEAEC9DD14504BC69CA3D4697EB939CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_872814288739F41EBFF2D4697EB9F0B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_872814288739F41EBFF2D4697EB9F0B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3D7EDFC4B7A679A63B60D4697EB99777" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3D7EDFC4B7A679A63B60D4697EB99777" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_CF962BB590B0EE0C7DF3D4697EB992FA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_CF962BB590B0EE0C7DF3D4697EB992FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_95411FF1BEEE9AB155BCD4697EB917DC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_95411FF1BEEE9AB155BCD4697EB917DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_F66EDA91AD1C571FA413D4697EB98C5C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_F66EDA91AD1C571FA413D4697EB98C5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_3C2ADF7380C59BC2C4B8D4697EB9C7F9" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_3C2ADF7380C59BC2C4B8D4697EB9C7F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_B75B00171C522A8563EFD4697EBABE41" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_B75B00171C522A8563EFD4697EBABE41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="loc_us-gaap_RepaymentsOfDebt_E997F8074CB0C78AB873D4697EBA3355" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_RepaymentsOfDebt_E997F8074CB0C78AB873D4697EBA3355" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_FE6BCA507CC0C27BBA0CD4697EBA4A68" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_FE6BCA507CC0C27BBA0CD4697EBA4A68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_1ADC700E6D1E8F372893D4697EBABBE8" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_1ADC700E6D1E8F372893D4697EBABBE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_839A896DFEC5705D4B55D4697EBA19E9" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_839A896DFEC5705D4B55D4697EBA19E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_1EFB284DC7E45FA1E991D4697EBA86D9" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4F929DC8FA9CD5BF1DC7D4697EB9E7EE" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_1EFB284DC7E45FA1E991D4697EBA86D9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/DebtShortTermBorrowingsAndLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:to="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_EEAF50E386DB73DEC220CF2908152D77" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:to="loc_us-gaap_StatementGeographicalAxis_EEAF50E386DB73DEC220CF2908152D77" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_EEAF50E386DB73DEC220CF2908152D77" xlink:to="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_EEAF50E386DB73DEC220CF2908152D77" xlink:to="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_KR" xlink:label="loc_country_KR_68D749A0BB4C239A4E61CF29081592BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:to="loc_country_KR_68D749A0BB4C239A4E61CF29081592BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_JP" xlink:label="loc_country_JP_9CF2624C177789FB6B22CF290816753F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:to="loc_country_JP_9CF2624C177789FB6B22CF290816753F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_TW" xlink:label="loc_country_TW_48582A9CF1BDA8C14FDECF290816DF10" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:to="loc_country_TW_48582A9CF1BDA8C14FDECF290816DF10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_CN" xlink:label="loc_country_CN_B44598FA5FC9D814F423CF290816CD5A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_1D9CA5FC7054E9DFAA91CF290815DE8D" xlink:to="loc_country_CN_B44598FA5FC9D814F423CF290816CD5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_05705891D1CF756C58F9CF2908168529" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:to="loc_us-gaap_DebtInstrumentAxis_05705891D1CF756C58F9CF2908168529" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_05705891D1CF756C58F9CF2908168529" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_05705891D1CF756C58F9CF2908168529" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member" xlink:label="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_68F0AEC03F43289889D0CF2908166EC7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_SeniorSecuredRevolvingCreditFacilitydueDecember2019Member_68F0AEC03F43289889D0CF2908166EC7" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorNotesDueJune2021Member" xlink:label="loc_amkr_SeniorNotesDueJune2021Member_170B94C27E50653020A5CF2908164D06" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_SeniorNotesDueJune2021Member_170B94C27E50653020A5CF2908164D06" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SeniorNotesDueOctober2022Member" xlink:label="loc_amkr_SeniorNotesDueOctober2022Member_B69DC6FFC2B441E73938CF2908165B65" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_SeniorNotesDueOctober2022Member_B69DC6FFC2B441E73938CF2908165B65" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_RevolvingcreditfacilitydueJune2017Member" xlink:label="loc_amkr_RevolvingcreditfacilitydueJune2017Member_1FD321402A053B73A998CF29081839BD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_RevolvingcreditfacilitydueJune2017Member_1FD321402A053B73A998CF29081839BD" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay2018Member" xlink:label="loc_amkr_TermLoanDueMay2018Member_89B2FBE5ADF5BD48CA4DCF2908186427" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanDueMay2018Member_89B2FBE5ADF5BD48CA4DCF2908186427" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueDecember2019Member" xlink:label="loc_amkr_TermLoanDueDecember2019Member_BE29241AD89669C5841FCF29081825DB" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanDueDecember2019Member_BE29241AD89669C5841FCF29081825DB" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay2020150MMember" xlink:label="loc_amkr_TermLoanDueMay2020150MMember_6742B3E7C7DD36AB195BCF2908194807" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanDueMay2020150MMember_6742B3E7C7DD36AB195BCF2908194807" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueMay202080MMember" xlink:label="loc_amkr_TermLoanDueMay202080MMember_A268A2B4F22245B56040CF2908195B30" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanDueMay202080MMember_A268A2B4F22245B56040CF2908195B30" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanDueJune2020Member" xlink:label="loc_amkr_TermLoanDueJune2020Member_7F3739ACDBB8549CCAC3CF2908197BE9" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanDueJune2020Member_7F3739ACDBB8549CCAC3CF2908197BE9" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_ShorttermtermloanvariablerateMember" xlink:label="loc_amkr_ShorttermtermloanvariablerateMember_B550BB02C6CF6C217477CF2908193919" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_ShorttermtermloanvariablerateMember_B550BB02C6CF6C217477CF2908193919" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoansDueApril2018Member" xlink:label="loc_amkr_TermLoansDueApril2018Member_2223D5B6CB158DCB84A2CF290819F157" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoansDueApril2018Member_2223D5B6CB158DCB84A2CF290819F157" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_RevolvingcreditfacilitydueNovember2020Member" xlink:label="loc_amkr_RevolvingcreditfacilitydueNovember2020Member_B8D2D9B884B96B37847ACF2908196315" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_RevolvingcreditfacilitydueNovember2020Member_B8D2D9B884B96B37847ACF2908196315" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TermLoanLIBORplus1.80dueDecember2019Member" xlink:label="loc_amkr_TermLoanLIBORplus1.80dueDecember2019Member_D35AF5276D2065824C3FCF29081928E7" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7C66F71C2E4F63ED58CACF2908163F3F" xlink:to="loc_amkr_TermLoanLIBORplus1.80dueDecember2019Member_D35AF5276D2065824C3FCF29081928E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_066B78203E8DBF4B3996CF2908191D00" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:to="loc_us-gaap_CreditFacilityAxis_066B78203E8DBF4B3996CF2908191D00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_CF6A9D771113263CDC0BCF2908194882_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_066B78203E8DBF4B3996CF2908191D00" xlink:to="loc_us-gaap_CreditFacilityDomain_CF6A9D771113263CDC0BCF2908194882_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_CF6A9D771113263CDC0BCF2908194882" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_066B78203E8DBF4B3996CF2908191D00" xlink:to="loc_us-gaap_CreditFacilityDomain_CF6A9D771113263CDC0BCF2908194882" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_EF0324EC0954F5AA9125CF290819A7A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_CF6A9D771113263CDC0BCF2908194882" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_EF0324EC0954F5AA9125CF290819A7A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9C8FAE0F324698EE03D9CF29081926DC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_A7E0DF3A2946C7EE3D7BCF290815ABA8" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9C8FAE0F324698EE03D9CF29081926DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9C8FAE0F324698EE03D9CF29081926DC" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9C8FAE0F324698EE03D9CF29081926DC" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_0AB0F74A45FEF8C838E1CF29081ADE64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D" xlink:to="loc_us-gaap_LineOfCreditMember_0AB0F74A45FEF8C838E1CF29081ADE64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_9B671EB2A88097915608CF29081F7C2B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D" xlink:to="loc_us-gaap_SeniorNotesMember_9B671EB2A88097915608CF29081F7C2B" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SubsidiaryTermLoansMember" xlink:label="loc_amkr_SubsidiaryTermLoansMember_541DB19F14CA072F7759CF29081F9E27" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_88A4B84814D259CD86AFCF29081AF28D" xlink:to="loc_amkr_SubsidiaryTermLoansMember_541DB19F14CA072F7759CF29081F9E27" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_LongtermDebtIncludingRelatedPartyGross" xlink:label="loc_amkr_LongtermDebtIncludingRelatedPartyGross_E18898F8F2C9F76423BBCF29082025DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:to="loc_amkr_LongtermDebtIncludingRelatedPartyGross_E18898F8F2C9F76423BBCF29082025DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_F9EE5101E5A2C98B55C6CF2908201B3C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_F9EE5101E5A2C98B55C6CF2908201B3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_6823BAEA2F08CD65F37DCF2908200B74" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:to="loc_us-gaap_DebtCurrent_6823BAEA2F08CD65F37DCF2908200B74" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_NonCurrentLongTermDebtIncludingRelatedParty" xlink:label="loc_amkr_NonCurrentLongTermDebtIncludingRelatedParty_48B98673270644382C5FCF2908202A33" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0DCE93B9759BCE2C3CAECF29081F170A" xlink:to="loc_amkr_NonCurrentLongTermDebtIncludingRelatedParty_48B98673270644382C5FCF2908202A33" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/DebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/DocumentAndEntityInformationDocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/EarningsPerShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/EarningsPerShareAntidilutiveDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2BF403A725018ABC6082CA254164F3F9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_B7C53BCA55C85C4C30F3CA2541646BBB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2BF403A725018ABC6082CA254164F3F9" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_B7C53BCA55C85C4C30F3CA2541646BBB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_FC1C9CC4580F0042B24BCA254164C058" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_B7C53BCA55C85C4C30F3CA2541646BBB" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_FC1C9CC4580F0042B24BCA254164C058" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_64B39DEEA2B494CBE11CCA2541649CF2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_FC1C9CC4580F0042B24BCA254164C058" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_64B39DEEA2B494CBE11CCA2541649CF2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_64B39DEEA2B494CBE11CCA2541649CF2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_FC1C9CC4580F0042B24BCA254164C058" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_64B39DEEA2B494CBE11CCA2541649CF2" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_StockOptionsAndRestrictedSharesMember" xlink:label="loc_amkr_StockOptionsAndRestrictedSharesMember_365D942668004CC5E6FACA2541646FE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_64B39DEEA2B494CBE11CCA2541649CF2" xlink:to="loc_amkr_StockOptionsAndRestrictedSharesMember_365D942668004CC5E6FACA2541646FE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_29C0BF8E8BCB5C61C7A1CA254164D61D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_2BF403A725018ABC6082CA254164F3F9" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_29C0BF8E8BCB5C61C7A1CA254164D61D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/EarningsPerShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLoss" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_51C6828A37C00646B6B2C5FC7BD75FC0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7F22F8E3BB410D5B22C8C5FC7BD7C58E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_51C6828A37C00646B6B2C5FC7BD75FC0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7F22F8E3BB410D5B22C8C5FC7BD7C58E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8BBB0E111F810B40E89BC5FC7BD77D9F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7F22F8E3BB410D5B22C8C5FC7BD7C58E" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8BBB0E111F810B40E89BC5FC7BD77D9F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8BBB0E111F810B40E89BC5FC7BD77D9F" xlink:to="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8BBB0E111F810B40E89BC5FC7BD77D9F" xlink:to="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_4BF6FD3380351C49C295C5FC7BD7A9B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_4BF6FD3380351C49C295C5FC7BD7A9B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_634CAB0B797EEA1FA35BC5FC7BD7EB9D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_634CAB0B797EEA1FA35BC5FC7BD7EB9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_F7961BE183302E48BFCAC5FC7BD7B682" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_CAF2BBE8338EBB2C7047C5FC7BD7D0C7" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_F7961BE183302E48BFCAC5FC7BD7B682" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_51C6828A37C00646B6B2C5FC7BD75FC0" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B1FA753B65E33B5E4343C5FC7BD710BB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_B1FA753B65E33B5E4343C5FC7BD710BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_FD66612AB09ABD3D44C3C5FC7BD7156E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_FD66612AB09ABD3D44C3C5FC7BD7156E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_E0C8E4532379EBA2AEC6C5FC7BD7DE75" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_E0C8E4532379EBA2AEC6C5FC7BD7DE75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_DC07220F4C2869013B14C5FC7BD81887" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_353BD9816FF500A2E7C3C5FC7BD73DCC" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_DC07220F4C2869013B14C5FC7BD81887" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:href="amkr-20170331.xsd#amkr_ScheduleOfStockholdersEquityLineItems" xlink:label="loc_amkr_ScheduleOfStockholdersEquityLineItems_A6650B4022A1E687123BC5DB361B6032" xlink:type="locator" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_ScheduleOfStockholdersEquityTable" xlink:label="loc_amkr_ScheduleOfStockholdersEquityTable_E91F603398456D06AFF1C5DB361BCC23" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_amkr_ScheduleOfStockholdersEquityLineItems_A6650B4022A1E687123BC5DB361B6032" xlink:to="loc_amkr_ScheduleOfStockholdersEquityTable_E91F603398456D06AFF1C5DB361BCC23" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_68C40BDFF9A65B55F068C5DB361BD9B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_amkr_ScheduleOfStockholdersEquityTable_E91F603398456D06AFF1C5DB361BCC23" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_68C40BDFF9A65B55F068C5DB361BD9B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_68C40BDFF9A65B55F068C5DB361BD9B3" xlink:to="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_68C40BDFF9A65B55F068C5DB361BD9B3" xlink:to="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaap_ParentMember_70DDDD70E332460BBC5BC5DB361BD4BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3" xlink:to="loc_us-gaap_ParentMember_70DDDD70E332460BBC5BC5DB361BD4BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_0A35D8F6207E5E144D79C5DB361B5170" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_BF978629103F836CD4FCC5DB361B75F3" xlink:to="loc_us-gaap_NoncontrollingInterestMember_0A35D8F6207E5E144D79C5DB361B5170" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_ScheduleOfStockholdersEquityLineItems_A6650B4022A1E687123BC5DB361B6032" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_10F28E4A505A9B5446EFC5DB361B1D70" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_10F28E4A505A9B5446EFC5DB361B1D70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_D86E750DCBCBF75ED0B1C5DB361B523D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_ProfitLoss_D86E750DCBCBF75ED0B1C5DB361B523D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_23489F36E1BCB7D8161DC5DB361BF6DE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_23489F36E1BCB7D8161DC5DB361BF6DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9CB54571D96E22100070C5DB361C2979" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9CB54571D96E22100070C5DB361C2979" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_1AD5E8043AB722696561C5DB361C5673" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_1AD5E8043AB722696561C5DB361C5673" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_39AEE07A7C53F6E16489C5DB361C3DE4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_39AEE07A7C53F6E16489C5DB361C3DE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsOfDividendsMinorityInterest" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_B590E884F8DD31538B71C5DB361C8D40" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_48DEB774C160182BB458C5DB361B0C40" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_B590E884F8DD31538B71C5DB361C8D40" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/EquityAndAccumulatedOtherComprehensiveIncomeLossTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/FactoringOfAccountsReceivable" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/FactoringOfAccountsReceivableNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringofAccountsReceivableLineItems" xlink:label="loc_amkr_FactoringofAccountsReceivableLineItems_198D1591AA74C9D4230C252F20477040" xlink:type="locator" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringofAccountsReceivableTable" xlink:label="loc_amkr_FactoringofAccountsReceivableTable_E1FD34A44976579867C3252F20425C22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_amkr_FactoringofAccountsReceivableLineItems_198D1591AA74C9D4230C252F20477040" xlink:to="loc_amkr_FactoringofAccountsReceivableTable_E1FD34A44976579867C3252F20425C22" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringofAccountsReceivableAxis" xlink:label="loc_amkr_FactoringofAccountsReceivableAxis_266C0EBF28283BFC0F94252F2047CF08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_amkr_FactoringofAccountsReceivableTable_E1FD34A44976579867C3252F20425C22" xlink:to="loc_amkr_FactoringofAccountsReceivableAxis_266C0EBF28283BFC0F94252F2047CF08" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringofAccountsReceivableDomain" xlink:label="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_amkr_FactoringofAccountsReceivableAxis_266C0EBF28283BFC0F94252F2047CF08" xlink:to="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2_default" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringofAccountsReceivableDomain" xlink:label="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_amkr_FactoringofAccountsReceivableAxis_266C0EBF28283BFC0F94252F2047CF08" xlink:to="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_TotalFactoredMember" xlink:label="loc_amkr_TotalFactoredMember_B8046CA23088A4E6388F252F20470C3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2" xlink:to="loc_amkr_TotalFactoredMember_B8046CA23088A4E6388F252F20470C3D" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_FactoringFeesMember" xlink:label="loc_amkr_FactoringFeesMember_F879109D2D57E08DC82C252F20477C9F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableDomain_BBA47186F71C3002B0DB252F20474DC2" xlink:to="loc_amkr_FactoringFeesMember_F879109D2D57E08DC82C252F20477C9F" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_AccountsReceivableSoldwithoutRecourse" xlink:label="loc_amkr_AccountsReceivableSoldwithoutRecourse_4563CF44274AA24095D2252F20488072" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_amkr_FactoringofAccountsReceivableLineItems_198D1591AA74C9D4230C252F20477040" xlink:to="loc_amkr_AccountsReceivableSoldwithoutRecourse_4563CF44274AA24095D2252F20488072" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/FairValueMeasurementsFairValueOfDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8BE8AB6DF1D06FD4D13E34D8B7FF3EF5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_21C034DDC800AFE26EC034D8B7FE8DCE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8BE8AB6DF1D06FD4D13E34D8B7FF3EF5" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_21C034DDC800AFE26EC034D8B7FE8DCE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_085C91B7EF8C2CE1CC1134D8B7FE0935" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_21C034DDC800AFE26EC034D8B7FE8DCE" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_085C91B7EF8C2CE1CC1134D8B7FE0935" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1BE2894AC253124F237F34D8B7FEE5EC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_085C91B7EF8C2CE1CC1134D8B7FE0935" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1BE2894AC253124F237F34D8B7FEE5EC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_7D68D307BC0B9B07F4F934D8B7FE0DEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_085C91B7EF8C2CE1CC1134D8B7FE0935" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_7D68D307BC0B9B07F4F934D8B7FE0DEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1BE2894AC253124F237F34D8B7FEE5EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_7D68D307BC0B9B07F4F934D8B7FE0DEF" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_1BE2894AC253124F237F34D8B7FEE5EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A5E6FDFE449ADFAB8F834D8B7FE5A4B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_7D68D307BC0B9B07F4F934D8B7FE0DEF" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A5E6FDFE449ADFAB8F834D8B7FE5A4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_C86B2FE6D4779B7EBD2834D8B7FE27A4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_7D68D307BC0B9B07F4F934D8B7FE0DEF" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_C86B2FE6D4779B7EBD2834D8B7FE27A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_83BFD18A242E21D7AD6234D8B7FE946F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_21C034DDC800AFE26EC034D8B7FE8DCE" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_83BFD18A242E21D7AD6234D8B7FE946F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83BFD18A242E21D7AD6234D8B7FE946F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83BFD18A242E21D7AD6234D8B7FE946F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="loc_us-gaap_SeniorNotesMember_0310F93D783D3DC0719434D8B7FF983E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1" xlink:to="loc_us-gaap_SeniorNotesMember_0310F93D783D3DC0719434D8B7FF983E" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SubsidiaryTermLoansandRevolvingCreditFacilitiesMember" xlink:label="loc_amkr_SubsidiaryTermLoansandRevolvingCreditFacilitiesMember_CB6D3565F2B250AE89AA34D8B7FF29DD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_04DFEDE5786ED49A684834D8B7FF79A1" xlink:to="loc_amkr_SubsidiaryTermLoansandRevolvingCreditFacilitiesMember_CB6D3565F2B250AE89AA34D8B7FF29DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_83B5ED89377586EA8F2634D8B7FF385E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_21C034DDC800AFE26EC034D8B7FE8DCE" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_83B5ED89377586EA8F2634D8B7FF385E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_83B5ED89377586EA8F2634D8B7FF385E" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_83B5ED89377586EA8F2634D8B7FF385E" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_FA63A864F7F6137D49FC34D8B7FFFCB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_FA63A864F7F6137D49FC34D8B7FFFCB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_4E56D7F6DED43E7DDC8134D8B7FFBB73" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_F6CA8DD16409B18808C434D8B7FF06CD" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_4E56D7F6DED43E7DDC8134D8B7FFBB73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_3AB57A3B903032A74EDD34D8B7FF01C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_8BE8AB6DF1D06FD4D13E34D8B7FF3EF5" xlink:to="loc_us-gaap_DebtInstrumentFairValue_3AB57A3B903032A74EDD34D8B7FF01C5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/FairValueMeasurementsRecurringFairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_02E90CE18CFBA82DF07D34D8B802C0E1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_134337682C80029C37E534D8B802C5F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_02E90CE18CFBA82DF07D34D8B802C0E1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_134337682C80029C37E534D8B802C5F5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_95257A8DE00EA117363434D8B8025F4B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_134337682C80029C37E534D8B802C5F5" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_95257A8DE00EA117363434D8B8025F4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1A9CA12EAC841B2D42D834D8B8022410_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_95257A8DE00EA117363434D8B8025F4B" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1A9CA12EAC841B2D42D834D8B8022410_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1A9CA12EAC841B2D42D834D8B8022410" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_95257A8DE00EA117363434D8B8025F4B" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1A9CA12EAC841B2D42D834D8B8022410" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_DDEB97AB357BB5B4ED6B34D8B802C64B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_1A9CA12EAC841B2D42D834D8B8022410" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_DDEB97AB357BB5B4ED6B34D8B802C64B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EF33BA5E73429047BE2D34D8B8025EC2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_134337682C80029C37E534D8B802C5F5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EF33BA5E73429047BE2D34D8B8025EC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B9FEDB3AB91B036C3AEB34D8B8021689_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EF33BA5E73429047BE2D34D8B8025EC2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B9FEDB3AB91B036C3AEB34D8B8021689_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B9FEDB3AB91B036C3AEB34D8B8021689" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EF33BA5E73429047BE2D34D8B8025EC2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B9FEDB3AB91B036C3AEB34D8B8021689" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_E846C27D41C24BFE158E34D8B80265A3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B9FEDB3AB91B036C3AEB34D8B8021689" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_E846C27D41C24BFE158E34D8B80265A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_50530A6CF7585B89B75334D8B80319FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_02E90CE18CFBA82DF07D34D8B802C0E1" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_50530A6CF7585B89B75334D8B80319FB" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_RestrictedCashFairValueDisclosure" xlink:label="loc_amkr_RestrictedCashFairValueDisclosure_DD558A4E4BC30D29CC7F34D8B8031007" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_02E90CE18CFBA82DF07D34D8B802C0E1" xlink:to="loc_amkr_RestrictedCashFairValueDisclosure_DD558A4E4BC30D29CC7F34D8B8031007" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/InterimFinancialStatements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/InterimFinancialStatementsPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/Inventories" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/InventoriesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/InventoriesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/NewAccountingStandards" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/OtherIncomeAndExpense" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/OtherIncomeAndExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/OtherIncomeAndExpenseTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/PensionPlans" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/PensionPlansForeignDefinedBenefitPensionPlansDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A7E916925FC6609FF4E1D542D661D56D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A7E916925FC6609FF4E1D542D661D56D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_9247C15864C54B104E39D542D6621368" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A7E916925FC6609FF4E1D542D661D56D" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_9247C15864C54B104E39D542D6621368" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_484A84083D782514A253D542D662BF0D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_9247C15864C54B104E39D542D6621368" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_484A84083D782514A253D542D662BF0D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_484A84083D782514A253D542D662BF0D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_9247C15864C54B104E39D542D6621368" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_484A84083D782514A253D542D662BF0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember_E397016613E241C97786D542D6627BEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_484A84083D782514A253D542D662BF0D" xlink:to="loc_us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember_E397016613E241C97786D542D6627BEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_D246DDF2590232ED1A7AD542D6623C9C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_D246DDF2590232ED1A7AD542D6623C9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_3208153B718BCEFF134CD542D6646719" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_3208153B718BCEFF134CD542D6646719" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D0274E74A91CBF8B47BBD542D6648268" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_D0274E74A91CBF8B47BBD542D6648268" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_70C0B2533F58BA442451D542D664EC03" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_70C0B2533F58BA442451D542D664EC03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_7E6C48F4B0A522FCDEC2D542D664D4D1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_7E6C48F4B0A522FCDEC2D542D664D4D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_06C409608B8E17A708E5D542D664D875" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_D5245DC502FC2CAACE5AD542D662CE9C" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_06C409608B8E17A708E5D542D664D875" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/PensionPlansNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/PensionPlansTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/PropertyPlantAndEquipment" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/PropertyPlantAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CD926AEB7FA13CF21044252F1FF566F5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1DBB801A453C7838F1B1252F1FF40B68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CD926AEB7FA13CF21044252F1FF566F5" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1DBB801A453C7838F1B1252F1FF40B68" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_CCC2C26873CA3EC4BB38252F1FF4029B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1DBB801A453C7838F1B1252F1FF40B68" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_CCC2C26873CA3EC4BB38252F1FF4029B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_CCC2C26873CA3EC4BB38252F1FF4029B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_CCC2C26873CA3EC4BB38252F1FF4029B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_C6393A4F02900E1610AF252F1FF5CAA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_LandMember_C6393A4F02900E1610AF252F1FF5CAA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UseRightsMember" xlink:label="loc_us-gaap_UseRightsMember_46B7E0C86E762B4AEC06252F1FF512E0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_UseRightsMember_46B7E0C86E762B4AEC06252F1FF512E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_3264E8C88B5AECAAFBCA252F1FF509C5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_3264E8C88B5AECAAFBCA252F1FF509C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_BA2AE116A5F8A13BFF44252F1FF52570" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_BA2AE116A5F8A13BFF44252F1FF52570" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_SoftwareAndComputerEquipmentMember" xlink:label="loc_amkr_SoftwareAndComputerEquipmentMember_A3C87D92A13F48E8BC5C252F1FF5A60B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_amkr_SoftwareAndComputerEquipmentMember_A3C87D92A13F48E8BC5C252F1FF5A60B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_503F8333CD19CB2C09DB252F1FF5F039" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_503F8333CD19CB2C09DB252F1FF5F039" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_0C9C22A853BD97A674DA252F1FF5B44A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_BBFA0676B952FC435C63252F1FF4CEAC" xlink:to="loc_us-gaap_ConstructionInProgressMember_0C9C22A853BD97A674DA252F1FF5B44A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_06C61BCEF060283AB8C3252F1FF5561D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CD926AEB7FA13CF21044252F1FF566F5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_06C61BCEF060283AB8C3252F1FF5561D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5DBF3FDD0B47E252AB36252F1FF54D25" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CD926AEB7FA13CF21044252F1FF566F5" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_5DBF3FDD0B47E252AB36252F1FF54D25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1C50F27E673F5FD9DEC1252F20033251" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_CD926AEB7FA13CF21044252F1FF566F5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_1C50F27E673F5FD9DEC1252F20033251" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/PropertyPlantAndEquipmentNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_D0E76502DFB957428AAAA1E00D0923E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_D0E76502DFB957428AAAA1E00D0923E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0674FEEA88BA4E3E714AA1E00D0AE437_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_D0E76502DFB957428AAAA1E00D0923E9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_0674FEEA88BA4E3E714AA1E00D0AE437_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0674FEEA88BA4E3E714AA1E00D0AE437" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_D0E76502DFB957428AAAA1E00D0923E9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_0674FEEA88BA4E3E714AA1E00D0AE437" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_9AF9C76E20B320D124D3A1E1D9B42721" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_0674FEEA88BA4E3E714AA1E00D0AE437" xlink:to="loc_us-gaap_SubsequentEventMember_9AF9C76E20B320D124D3A1E1D9B42721" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_D89EA488E858092A7A1AA19D51D8C870" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_D89EA488E858092A7A1AA19D51D8C870" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_78D792DA03F7562572D6A19D51D8A554_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_D89EA488E858092A7A1AA19D51D8C870" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_78D792DA03F7562572D6A19D51D8A554_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_78D792DA03F7562572D6A19D51D8A554" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_D89EA488E858092A7A1AA19D51D8C870" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_78D792DA03F7562572D6A19D51D8A554" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_404961809EF4525C9465A19D51D87F6E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_78D792DA03F7562572D6A19D51D8A554" xlink:to="loc_us-gaap_ConstructionInProgressMember_404961809EF4525C9465A19D51D87F6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_F690F109B85EC70F2602A19D51D8455D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_F690F109B85EC70F2602A19D51D8455D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_7E3B8713B07AE532C2DFA19D51D837ED_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_F690F109B85EC70F2602A19D51D8455D" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_7E3B8713B07AE532C2DFA19D51D837ED_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_7E3B8713B07AE532C2DFA19D51D837ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_F690F109B85EC70F2602A19D51D8455D" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_7E3B8713B07AE532C2DFA19D51D837ED" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_K5FacilityMember" xlink:label="loc_amkr_K5FacilityMember_29604FD593FDF810B25EA19D51D81A1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_7E3B8713B07AE532C2DFA19D51D837ED" xlink:to="loc_amkr_K5FacilityMember_29604FD593FDF810B25EA19D51D81A1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_C1C08FDBCB19BD064CECA19D51D8B483" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_DB8559FBBD2C43D7F0BFA19D51D75C7B" xlink:to="loc_us-gaap_StatementGeographicalAxis_C1C08FDBCB19BD064CECA19D51D8B483" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_BCB44106F19A15D77672A19D51D84869_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_C1C08FDBCB19BD064CECA19D51D8B483" xlink:to="loc_us-gaap_SegmentGeographicalDomain_BCB44106F19A15D77672A19D51D84869_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_BCB44106F19A15D77672A19D51D84869" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_C1C08FDBCB19BD064CECA19D51D8B483" xlink:to="loc_us-gaap_SegmentGeographicalDomain_BCB44106F19A15D77672A19D51D84869" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_KR" xlink:label="loc_country_KR_1410C46F4CC44F4E57B0A19D51D84A0E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_BCB44106F19A15D77672A19D51D84869" xlink:to="loc_country_KR_1410C46F4CC44F4E57B0A19D51D84A0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_012E243B2B873E75E39FA19D51D81194" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_us-gaap_Depreciation_012E243B2B873E75E39FA19D51D81194" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_90B94D3C7BFF51BE04EBA19D51D8CDF0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_90B94D3C7BFF51BE04EBA19D51D8CDF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_88EBEE395CEEFEF5B2B4A19D51D8CA47" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_88EBEE395CEEFEF5B2B4A19D51D8CA47" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_PercentageofProceedsReceived" xlink:label="loc_amkr_PercentageofProceedsReceived_B56D17B997634FF98448A19D51D88321" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_amkr_PercentageofProceedsReceived_B56D17B997634FF98448A19D51D88321" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_DE49CEE3134DD78F9A6BA19D51D8F3E9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_DE49CEE3134DD78F9A6BA19D51D8F3E9" xlink:type="arc" />
    <link:loc xlink:href="amkr-20170331.xsd#amkr_LonglivedAssetsHeldforSaleCurrent" xlink:label="loc_amkr_LonglivedAssetsHeldforSaleCurrent_CDC994AE65D1A6C4D1BAA1E94E719AA9" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_FDE4B87ACA6F1CBD9EFBA19D51D87AE3" xlink:to="loc_amkr_LonglivedAssetsHeldforSaleCurrent_CDC994AE65D1A6C4D1BAA1E94E719AA9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/PropertyPlantAndEquipmentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlans" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansCompensationExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F9D5D3624F27D705D8EB34D8B8801203" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0992E86714D5FE147D2834D8B87F631F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F9D5D3624F27D705D8EB34D8B8801203" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0992E86714D5FE147D2834D8B87F631F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_23CBC02D5A69231953DB34D8B8807F00" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0992E86714D5FE147D2834D8B87F631F" xlink:to="loc_us-gaap_AwardTypeAxis_23CBC02D5A69231953DB34D8B8807F00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_23CBC02D5A69231953DB34D8B8807F00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_23CBC02D5A69231953DB34D8B8807F00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_B4750E318C8AC2876A4C34D8B8800057" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687" xlink:to="loc_us-gaap_EmployeeStockOptionMember_B4750E318C8AC2876A4C34D8B8800057" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_EC824B3BE1EC4BF870E134D8B880EB63" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C526C7C931F2D6B2F9A834D8B8804687" xlink:to="loc_us-gaap_RestrictedStockMember_EC824B3BE1EC4BF870E134D8B880EB63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_A9ABF30720CFD318897434D8B8801DDF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F9D5D3624F27D705D8EB34D8B8801203" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_A9ABF30720CFD318897434D8B8801DDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_259704A1A894ACF352FE34D8B8807047" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F9D5D3624F27D705D8EB34D8B8801203" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_259704A1A894ACF352FE34D8B8807047" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansRestrictedSharesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7BE15BB0FDF23458B142D54AC4EEE934" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_94356ED00D20D5792B74D54AC4EE0862" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7BE15BB0FDF23458B142D54AC4EEE934" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_94356ED00D20D5792B74D54AC4EE0862" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_23D35CC74459FEA7DBC8D54AC4EE8344" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_94356ED00D20D5792B74D54AC4EE0862" xlink:to="loc_us-gaap_AwardTypeAxis_23D35CC74459FEA7DBC8D54AC4EE8344" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CA23AF0E33EC95BA869CD54AC4EE21DD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_23D35CC74459FEA7DBC8D54AC4EE8344" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CA23AF0E33EC95BA869CD54AC4EE21DD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CA23AF0E33EC95BA869CD54AC4EE21DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_23D35CC74459FEA7DBC8D54AC4EE8344" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CA23AF0E33EC95BA869CD54AC4EE21DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_176539C01E5357F84BCED54AC4EEE983" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_CA23AF0E33EC95BA869CD54AC4EE21DD" xlink:to="loc_us-gaap_RestrictedStockMember_176539C01E5357F84BCED54AC4EEE983" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7BE15BB0FDF23458B142D54AC4EEE934" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6FE7AD632542CF5CEADFD54AC4EEB9D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6FE7AD632542CF5CEADFD54AC4EEB9D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B7963B6871877096AC56D54AC4EEEC4D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B7963B6871877096AC56D54AC4EEEC4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_7B93500FB0AFAC1335CDD54AC4EE1901" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_7B93500FB0AFAC1335CDD54AC4EE1901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1AD5EA8EB96CB580B3B8D54AC4EE3C87" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_275D50D52ACAF0C60E16D54AC4EEB842" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1AD5EA8EB96CB580B3B8D54AC4EE3C87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7BE15BB0FDF23458B142D54AC4EEE934" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1C07160B1954E72D075ED54AC4EF1F5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_1C07160B1954E72D075ED54AC4EF1F5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_770B1B2AE9558C965042D54AC4EFDEB1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_770B1B2AE9558C965042D54AC4EFDEB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_DFBC6CDA7A341F57B162D54AC4EF01F7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_DFBC6CDA7A341F57B162D54AC4EF01F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5FE03B733A68522116C0D54AC4EF6689" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_3CE2FCFD68B341275002D54AC4EF7CF8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5FE03B733A68522116C0D54AC4EF6689" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansStockOptionsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.amkor.com/role/ShareBasedCompensationPlansWeightedAverageFairValueDetails" xlink:type="extended" />
</link:linkbase>