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<link:definition>1003 - Statement - Consolidated Statements of Profit or Loss</link:definition>
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<link:definition>1004 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
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<link:definition>1005 - Statement - Consolidated Statements of Changes in Equity</link:definition>
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<link:definition>1006 - Statement - Consolidated Statements of Cash Flows</link:definition>
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<link:definition>999001 - Disclosure - General Information</link:definition>
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<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/MaterialAccountingPolicies" id="MaterialAccountingPolicies">
<link:definition>999002 - Disclosure - Material Accounting Policies</link:definition>
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<link:definition>999003 - Disclosure - Critical Accounting Estimates and Assumptions</link:definition>
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<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/FinancialInstrumentsByCategory" id="FinancialInstrumentsByCategory">
<link:definition>999004 - Disclosure - Financial Instruments by Category</link:definition>
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<link:roleType roleURI="http://www.kt.com/role/CashAndCashEquivalents" id="CashAndCashEquivalents">
<link:definition>999005 - Disclosure - Cash and Cash Equivalents</link:definition>
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<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/TradeAndOtherReceivables" id="TradeAndOtherReceivables">
<link:definition>999006 - Disclosure - Trade and Other Receivables</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/OtherFinancialAssetsAndLiabilities" id="OtherFinancialAssetsAndLiabilities">
<link:definition>999007 - Disclosure - Other Financial Assets and Liabilities</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/Inventories" id="Inventories">
<link:definition>999008 - Disclosure - Inventories</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/OtherAssetsAndLiabilities" id="OtherAssetsAndLiabilities">
<link:definition>999009 - Disclosure - Other Assets and Liabilities</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/PropertyAndEquipment" id="PropertyAndEquipment">
<link:definition>999010 - Disclosure - Property and Equipment</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/InvestmentProperties" id="InvestmentProperties">
<link:definition>999011 - Disclosure - Investment Properties</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:definition>999012 - Disclosure - Intangible Assets</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/InvestmentsInAssociatesAndJointVentures" id="InvestmentsInAssociatesAndJointVentures">
<link:definition>999013 - Disclosure - Investments in Associates and Joint Ventures</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/TradeAndOtherPayables" id="TradeAndOtherPayables">
<link:definition>999014 - Disclosure - Trade and Other Payables</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/Borrowings" id="Borrowings">
<link:definition>999015 - Disclosure - Borrowings</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/Provisions" id="Provisions">
<link:definition>999016 - Disclosure - Provisions</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/NetDefinedBenefitLiabilitiesAssets" id="NetDefinedBenefitLiabilitiesAssets">
<link:definition>999017 - Disclosure - Net Defined Benefit Liabilities (Assets)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/DefinedContributionPlan" id="DefinedContributionPlan">
<link:definition>999018 - Disclosure - Defined Contribution Plan</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/CommitmentsAndContingencies" id="CommitmentsAndContingencies">
<link:definition>999019 - Disclosure - Commitments and Contingencies</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/Leases" id="Leases">
<link:definition>999020 - Disclosure - Leases</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/ShareCapital" id="ShareCapital">
<link:definition>999021 - Disclosure - Share Capital</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/RetainedEarnings" id="RetainedEarnings">
<link:definition>999022 - Disclosure - Retained Earnings</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/AccumulatedOtherComprehensiveIncomeAndOtherComponentsOfEquity" id="AccumulatedOtherComprehensiveIncomeAndOtherComponentsOfEquity">
<link:definition>999023 - Disclosure - Accumulated Other Comprehensive Income and Other Components of Equity</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/ShareBasedPayments" id="ShareBasedPayments">
<link:definition>999024 - Disclosure - Share-based Payments</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/RevenueFromContractsWithCustomersOtherIncomeAndRelevantContractAssetsAndLiabilities" id="RevenueFromContractsWithCustomersOtherIncomeAndRelevantContractAssetsAndLiabilities">
<link:definition>999025 - Disclosure - Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/OtherIncome" id="OtherIncome">
<link:definition>999026 - Disclosure - Other Income</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/OperatingExpenses" id="OperatingExpenses">
<link:definition>999027 - Disclosure - Operating Expenses</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/FinancialIncomeAndCosts" id="FinancialIncomeAndCosts">
<link:definition>999028 - Disclosure - Financial Income and Costs</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/DeferredIncomeTaxAndIncomeTaxExpense" id="DeferredIncomeTaxAndIncomeTaxExpense">
<link:definition>999029 - Disclosure - Deferred Income Tax and income Tax Expense</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/EarningsPerShare" id="EarningsPerShare">
<link:definition>999030 - Disclosure - Earnings per Share</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/Dividend" id="Dividend">
<link:definition>999031 - Disclosure - Dividend</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/CashGeneratedFromOperations" id="CashGeneratedFromOperations">
<link:definition>999032 - Disclosure - Cash Generated from Operations</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/ChangesInLiabilitiesArisingFromFinancingActivities" id="ChangesInLiabilitiesArisingFromFinancingActivities">
<link:definition>999033 - Disclosure - Changes in Liabilities Arising from Financing Activities</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/SegmentInformation" id="SegmentInformation">
<link:definition>999034 - Disclosure - Segment Information</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/RelatedPartyTransactions" id="RelatedPartyTransactions">
<link:definition>999035 - Disclosure - Related Party Transactions</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/FinancialRiskManagement" id="FinancialRiskManagement">
<link:definition>999036 - Disclosure - Financial Risk Management</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/FairValue" id="FairValue">
<link:definition>999037 - Disclosure - Fair Value</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/InterestsInUnconsolidatedStructuredEntities" id="InterestsInUnconsolidatedStructuredEntities">
<link:definition>999038 - Disclosure - Interests in Unconsolidated Structured Entities</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/InformationAboutNonControllingInterests" id="InformationAboutNonControllingInterests">
<link:definition>999039 - Disclosure - Information About Non-controlling Interests</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/EventsAfterTheReportingPeriod" id="EventsAfterTheReportingPeriod">
<link:definition>999040 - Disclosure - Events After the Reporting Period</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/MaterialAccountingPoliciesPolicies" id="MaterialAccountingPoliciesPolicies">
<link:definition>999041 - Disclosure - Material Accounting Policies (Policies)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/GeneralInformationTables" id="GeneralInformationTables">
<link:definition>999042 - Disclosure - General Information (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/MaterialAccountingPoliciesTables" id="MaterialAccountingPoliciesTables">
<link:definition>999043 - Disclosure - Material Accounting Policies (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/FinancialInstrumentsByCategoryTables" id="FinancialInstrumentsByCategoryTables">
<link:definition>999044 - Disclosure - Financial Instruments by Category (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/CashAndCashEquivalentsTables" id="CashAndCashEquivalentsTables">
<link:definition>999045 - Disclosure - Cash and Cash Equivalents (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/TradeAndOtherReceivablesTables" id="TradeAndOtherReceivablesTables">
<link:definition>999046 - Disclosure - Trade and Other Receivables (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/OtherFinancialAssetsAndLiabilitiesTables" id="OtherFinancialAssetsAndLiabilitiesTables">
<link:definition>999047 - Disclosure - Other Financial Assets and Liabilities (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/InventoriesTables" id="InventoriesTables">
<link:definition>999048 - Disclosure - Inventories (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/OtherAssetsAndLiabilitiesTables" id="OtherAssetsAndLiabilitiesTables">
<link:definition>999049 - Disclosure - Other Assets and Liabilities (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/PropertyAndEquipmentTables" id="PropertyAndEquipmentTables">
<link:definition>999050 - Disclosure - Property and Equipment (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/InvestmentPropertiesTables" id="InvestmentPropertiesTables">
<link:definition>999051 - Disclosure - Investment Properties (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/IntangibleAssetsTables" id="IntangibleAssetsTables">
<link:definition>999052 - Disclosure - Intangible Assets (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/InvestmentsInAssociatesAndJointVenturesTables" id="InvestmentsInAssociatesAndJointVenturesTables">
<link:definition>999053 - Disclosure - Investments in Associates and Joint Ventures (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/TradeAndOtherPayablesTables" id="TradeAndOtherPayablesTables">
<link:definition>999054 - Disclosure - Trade and Other Payables (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.kt.com/role/BorrowingsTables" id="BorrowingsTables">
<link:definition>999055 - Disclosure - Borrowings (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
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<link:roleType roleURI="http://www.kt.com/role/ProvisionsTables" id="ProvisionsTables">
<link:definition>999056 - Disclosure - Provisions (Tables)</link:definition>
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<link:roleType roleURI="http://www.kt.com/role/FairValueTables" id="FairValueTables">
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<link:roleType roleURI="http://www.kt.com/role/GeneralInformationAdditionalInformationDetail" id="GeneralInformationAdditionalInformationDetail">
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<link:roleType roleURI="http://www.kt.com/role/GeneralInformationSummaryOfConsolidatedSubsidiariesParentheticalDetail" id="GeneralInformationSummaryOfConsolidatedSubsidiariesParentheticalDetail">
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<link:roleType roleURI="http://www.kt.com/role/MaterialAccountingPoliciesAdditionalInformationDetail" id="MaterialAccountingPoliciesAdditionalInformationDetail">
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<link:roleType roleURI="http://www.kt.com/role/FinancialInstrumentsByCategorySummaryOfFinancialInstrumentsByCategoryDetail" id="FinancialInstrumentsByCategorySummaryOfFinancialInstrumentsByCategoryDetail">
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<link:roleType roleURI="http://www.kt.com/role/PropertyAndEquipmentAdditionalInformationDetail" id="PropertyAndEquipmentAdditionalInformationDetail">
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<element name="InformationCommunicationFinancialCooperativeMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_InformationCommunicationFinancialCooperativeMember" substitutionGroup="xbrli:item" />
<element name="CollateralMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CollateralMember" substitutionGroup="xbrli:item" />
<element name="ContingentLiabilitiesGuaranteeBeneficiaryAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_ContingentLiabilitiesGuaranteeBeneficiaryAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="ContingentLiabilitiesGuaranteeBeneficiaryDomain" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_ContingentLiabilitiesGuaranteeBeneficiaryDomain" substitutionGroup="xbrli:item" />
<element name="KoreaSecuritiesFinanceCorpMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_KoreaSecuritiesFinanceCorpMember" substitutionGroup="xbrli:item" />
<element name="DescriptionOfSubjectToPaymentGuarantees" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_DescriptionOfSubjectToPaymentGuarantees" substitutionGroup="xbrli:item" />
<element name="KtEngineeringCoLtdMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_KtEngineeringCoLtdMember" substitutionGroup="xbrli:item" />
<element name="DisclosureOfInvestmentPropertiesProvidedAsCollateralTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfInvestmentPropertiesProvidedAsCollateralTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="DisclosureOfInvestmentPropertiesProvidedAsCollateralLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfInvestmentPropertiesProvidedAsCollateralLineItems" substitutionGroup="xbrli:item" />
<element name="RelatedAmountDescriptionInInvestmentProperties" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_RelatedAmountDescriptionInInvestmentProperties" substitutionGroup="xbrli:item" />
<element name="InvestmentPropertiesHeldAsCollateralCarryingAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_InvestmentPropertiesHeldAsCollateralCarryingAmount" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="InvestmentPropertiesHeldAsCollateralSecuredAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_InvestmentPropertiesHeldAsCollateralSecuredAmount" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="Mortgagee" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_Mortgagee" substitutionGroup="xbrli:item" />
<element name="CollateralSecuredPartyAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CollateralSecuredPartyAxis" substitutionGroup="xbrldt:dimensionItem" />
<element name="CollateralSecuredPartyMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CollateralSecuredPartyMember" substitutionGroup="xbrli:item" />
<element name="IndustrialBankOfKoreaAndShinhanBankAndStandardCharteredBankMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_IndustrialBankOfKoreaAndShinhanBankAndStandardCharteredBankMember" substitutionGroup="xbrli:item" />
<element name="LeaseholderMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_LeaseholderMember" substitutionGroup="xbrli:item" />
<element name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CommitmentsAndContingenciesTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="KDefenseCo.ltdMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_KDefenseCo.ltdMember" substitutionGroup="xbrli:item" />
<element name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CommitmentsAndContingenciesLineItems" substitutionGroup="xbrli:item" />
<element name="NumberOfLawsuitsFaced" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_NumberOfLawsuitsFaced" substitutionGroup="xbrli:item" />
<element name="LitigationSettlementsClaimAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_LitigationSettlementsClaimAmount" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="GuaranteeInterestPercentage" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_GuaranteeInterestPercentage" substitutionGroup="xbrli:item" />
<element name="AcquisitionContractAgreementNotYetRecognizedAsLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_AcquisitionContractAgreementNotYetRecognizedAsLiabilities" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="AdditionalCumulativeInvestmentAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_AdditionalCumulativeInvestmentAmount" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PercentageOfEstimatedFinancialEffectOfContingentLiabilities" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_PercentageOfEstimatedFinancialEffectOfContingentLiabilities" substitutionGroup="xbrli:item" />
<element name="TradeAndOtherPayablesSupplierFinanceArrangements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_TradeAndOtherPayablesSupplierFinanceArrangements" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="AmountReceivedFromFinanceProvider" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_AmountReceivedFromFinanceProvider" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="DisclosureOfBalanceSheetInformationAboutLeasesForLesseeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfBalanceSheetInformationAboutLeasesForLesseeAbstract" substitutionGroup="xbrli:item" />
<element name="DisclosureOfBalanceSheetInformationAboutLeasesForLesseeTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfBalanceSheetInformationAboutLeasesForLesseeTable" substitutionGroup="xbrldt:hypercubeItem" />
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<element name="MachineryAndCommunicationLineFacilitiesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_MachineryAndCommunicationLineFacilitiesMember" substitutionGroup="xbrli:item" />
<element name="DisclosureOfStatementOfProfitOrLossInformationAboutLeasesForLesseeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfStatementOfProfitOrLossInformationAboutLeasesForLesseeAbstract" substitutionGroup="xbrli:item" />
<element name="DisclosureOfStatementOfProfitOrLossInformationAboutLeasesForLesseeTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfStatementOfProfitOrLossInformationAboutLeasesForLesseeTable" substitutionGroup="xbrldt:hypercubeItem" />
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<element name="DepreciationRightsOfUseAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_DepreciationRightsOfUseAssets" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="DisclosureOfArrangementInvolvingLegalFormOfLeaseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfArrangementInvolvingLegalFormOfLeaseAbstract" substitutionGroup="xbrli:item" />
<element name="IncreaseDecreaseInRightOfUseAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_IncreaseDecreaseInRightOfUseAssets" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfTreasurySharesRetiredAgainstRetainedEarnings" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_NumberOfTreasurySharesRetiredAgainstRetainedEarnings" substitutionGroup="xbrli:item" />
<element name="RetainedEarningsTransferredToLegalReserves" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_RetainedEarningsTransferredToLegalReserves" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="VoluntaryReserves" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_VoluntaryReserves" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="UnappropriatedRetainedEarnings" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_UnappropriatedRetainedEarnings" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="MinimumPercentageOfCashDividendDeclaredAppropriationToLegalReserve" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_MinimumPercentageOfCashDividendDeclaredAppropriationToLegalReserve" substitutionGroup="xbrli:item" />
<element name="PercentageOfLegalReservesEqualToCapitalStock" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_PercentageOfLegalReservesEqualToCapitalStock" substitutionGroup="xbrli:item" />
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<element name="GainOnValuationOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_GainOnValuationOfFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember" substitutionGroup="xbrli:item" />
<element name="ExchangeDifferencesOnTranslationForForeignOperationsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_ExchangeDifferencesOnTranslationForForeignOperationsMember" substitutionGroup="xbrli:item" />
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<element name="TreasurySharesAmountDirectlyReflectedInEquity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_TreasurySharesAmountDirectlyReflectedInEquity" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfTreasuryShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_NumberOfTreasuryShares" substitutionGroup="xbrli:item" />
<element name="SeventeenthGrantMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_SeventeenthGrantMember" substitutionGroup="xbrli:item" />
<element name="EighteenGrantMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_EighteenGrantMember" substitutionGroup="xbrli:item" />
<element name="TotalCompensationCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_TotalCompensationCosts" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="SixteenthGrantMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_SixteenthGrantMember" substitutionGroup="xbrli:item" />
<element name="PercentageOfGrantedSharesWillVest" type="dtr-types:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="kt_PercentageOfGrantedSharesWillVest" substitutionGroup="xbrli:item" />
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<element name="RevenueFromRenderingOfMediaAndContent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_RevenueFromRenderingOfMediaAndContent" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="RevenueFromRenderingOfFinancialServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_RevenueFromRenderingOfFinancialServices" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="RevenueFromRenderingOfOtherServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_RevenueFromRenderingOfOtherServices" substitutionGroup="xbrli:item" xbrli:balance="credit" />
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<element name="LongTermConstructionContractMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_LongTermConstructionContractMember" substitutionGroup="xbrli:item" />
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<element name="CostOfContractPerformanceMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_CostOfContractPerformanceMember" substitutionGroup="xbrli:item" />
<element name="OperatingExpensesRelatedToContractCostAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_OperatingExpensesRelatedToContractCostAssets" substitutionGroup="xbrli:item" xbrli:balance="debit" />
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<element name="GainsOnGovernmentSubsidies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_GainsOnGovernmentSubsidies" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="GainsLossesOnDisposalOfPropertyPlantAndEquipmentAndInvestmentProperties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_GainsLossesOnDisposalOfPropertyPlantAndEquipmentAndInvestmentProperties" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="GainLossesOnDisposalOfIntangibleAssetsOtherThanGoodwill" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_GainLossesOnDisposalOfIntangibleAssetsOtherThanGoodwill" substitutionGroup="xbrli:item" xbrli:balance="credit" />
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<element name="InterconnectionCharges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_InterconnectionCharges" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="InternationalInterconnectionFee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_InternationalInterconnectionFee" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="PurchaseOfInventories" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_PurchaseOfInventories" substitutionGroup="xbrli:item" xbrli:balance="debit" />
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<element name="SalesCommission" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_SalesCommission" substitutionGroup="xbrli:item" xbrli:balance="debit" />
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<element name="InstallationFee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_InstallationFee" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="AdvertisingExpense1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_AdvertisingExpense1" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="CardServiceCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_CardServiceCost" substitutionGroup="xbrli:item" xbrli:balance="debit" />
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<element name="PostemploymentBenefitExpenseShareBasedPayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_PostemploymentBenefitExpenseShareBasedPayment" substitutionGroup="xbrli:item" xbrli:balance="debit" />
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<element name="DisclosureOfFinanceIncomeLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="kt_DisclosureOfFinanceIncomeLineItems" substitutionGroup="xbrli:item" />
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<element name="GainOnDisposalOfTradeReceivables" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="kt_GainOnDisposalOfTradeReceivables" substitutionGroup="xbrli:item" xbrli:balance="credit" />
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