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        <link:definition>061600 - Disclosure - Goodwill and impairment</link:definition>
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        <link:definition>061700 - Disclosure - Borrowings and lease liabilities</link:definition>
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        <link:definition>062000 - Disclosure - Issued capital</link:definition>
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        <link:definition>062400 - Disclosure - Financial instruments</link:definition>
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        <link:definition>062700 - Disclosure - Interests in subsidiaries</link:definition>
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        <link:definition>062800 - Disclosure - Reconciliation of loss after income tax to net cash from/(used in) operating activities</link:definition>
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        <link:definition>062900 - Disclosure - Non-cash investing and financing activities</link:definition>
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        <link:definition>063000 - Disclosure - Contingent Liabilities</link:definition>
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      <link:roleType roleURI="http://irisenergy.co/role/SharebasedPayments" id="SharebasedPayments">
        <link:definition>063100 - Disclosure - Share-based payments</link:definition>
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        <link:definition>063200 - Disclosure - Related party transactions</link:definition>
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        <link:definition>063300 - Disclosure - Key management personnel disclosures</link:definition>
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        <link:definition>063400 - Disclosure - Events after the reporting period</link:definition>
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        <link:definition>070200 - Disclosure - Significant accounting policies (Policies)</link:definition>
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      <link:roleType roleURI="http://irisenergy.co/role/SignificantAccountingPoliciesTables" id="SignificantAccountingPoliciesTables">
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        <link:definition>080200 - Disclosure - Significant accounting policies (Tables)</link:definition>
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        <link:definition>080400 - Disclosure - Operating segments (Tables)</link:definition>
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        <link:definition>080500 - Disclosure - Other income (Tables)</link:definition>
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        <link:definition>080600 - Disclosure - Depreciation (Tables)</link:definition>
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        <link:definition>080700 - Disclosure - Other operating expenses (Tables)</link:definition>
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        <link:definition>080800 - Disclosure - Finance expense (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>080900 - Disclosure - Income tax expense (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/CashAndCashEquivalentsTables" id="CashAndCashEquivalentsTables">
        <!--Parent Role: Cash and cash equivalents-->
        <link:definition>081000 - Disclosure - Cash and cash equivalents (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/OtherReceivablesTables" id="OtherReceivablesTables">
        <!--Parent Role: Other receivables-->
        <link:definition>081100 - Disclosure - Other receivables (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/MiningHardwarePrepaymentsTables" id="MiningHardwarePrepaymentsTables">
        <!--Parent Role: Mining hardware prepayments-->
        <link:definition>081200 - Disclosure - Mining hardware prepayments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/PrepaymentsAndOtherAssetsTables" id="PrepaymentsAndOtherAssetsTables">
        <!--Parent Role: Prepayments and other assets-->
        <link:definition>081300 - Disclosure - Prepayments and other assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/PropertyPlantAndEquipmentTables" id="PropertyPlantAndEquipmentTables">
        <!--Parent Role: Property, plant and equipment-->
        <link:definition>081400 - Disclosure - Property, plant and equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/RightofuseAssetsTables" id="RightofuseAssetsTables">
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        <link:definition>081500 - Disclosure - Right-of-use assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/GoodwillAndImpairmentTables" id="GoodwillAndImpairmentTables">
        <!--Parent Role: Goodwill and impairment-->
        <link:definition>081600 - Disclosure - Goodwill and impairment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/BorrowingsAndLeaseLiabilitiesTables" id="BorrowingsAndLeaseLiabilitiesTables">
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        <link:definition>081700 - Disclosure - Borrowings and lease liabilities (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://irisenergy.co/role/ProvisionsTables" id="ProvisionsTables">
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        <link:definition>081800 - Disclosure - Provisions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>081900 - Disclosure - Trade and other payables (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IssuedCapitalTables" id="IssuedCapitalTables">
        <!--Parent Role: Issued capital-->
        <link:definition>082000 - Disclosure - Issued capital (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/ReservesTables" id="ReservesTables">
        <!--Parent Role: Reserves-->
        <link:definition>082100 - Disclosure - Reserves (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/EarningsPerShareTables" id="EarningsPerShareTables">
        <!--Parent Role: Earnings per share-->
        <link:definition>082300 - Disclosure - Earnings per share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinancialInstrumentsTables" id="FinancialInstrumentsTables">
        <!--Parent Role: Financial instruments-->
        <link:definition>082400 - Disclosure - Financial instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/CommitmentsTables" id="CommitmentsTables">
        <!--Parent Role: Commitments-->
        <link:definition>082600 - Disclosure - Commitments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/InterestsInSubsidiariesTables" id="InterestsInSubsidiariesTables">
        <!--Parent Role: Interests in subsidiaries-->
        <link:definition>082700 - Disclosure - Interests in subsidiaries (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/ReconciliationOfLossAfterIncomeTaxToNetCashFromUsedInOperatingActivitiesTables" id="ReconciliationOfLossAfterIncomeTaxToNetCashFromUsedInOperatingActivitiesTables">
        <!--Parent Role: Reconciliation of loss after income tax to net cash from/(used in) operating activities-->
        <link:definition>082800 - Disclosure - Reconciliation of loss after income tax to net cash from/(used in) operating activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/NoncashInvestingAndFinancingActivitiesTables" id="NoncashInvestingAndFinancingActivitiesTables">
        <!--Parent Role: Non-cash investing and financing activities-->
        <link:definition>082900 - Disclosure - Non-cash investing and financing activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/SharebasedPaymentsTables" id="SharebasedPaymentsTables">
        <!--Parent Role: Share-based payments-->
        <link:definition>083100 - Disclosure - Share-based payments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/KeyManagementPersonnelDisclosuresTables" id="KeyManagementPersonnelDisclosuresTables">
        <!--Parent Role: Key management personnel disclosures-->
        <link:definition>083300 - Disclosure - Key management personnel disclosures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/GeneralInformationDetails" id="GeneralInformationDetails">
        <!--Parent Role: General information-->
        <link:definition>090100 - Disclosure - General information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/SignificantAccountingPoliciesGoingConcernDetails" id="SignificantAccountingPoliciesGoingConcernDetails">
        <!--Parent Role: Significant accounting policies-->
        <link:definition>090200 - Disclosure - Significant accounting policies, Going Concern (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/SignificantAccountingPoliciesRevenueAndOtherIncomeRecognitionAndPropertyPlantAndEquipmentDetails" id="SignificantAccountingPoliciesRevenueAndOtherIncomeRecognitionAndPropertyPlantAndEquipmentDetails">
        <!--Parent Role: Significant accounting policies-->
        <link:definition>090202 - Disclosure - Significant accounting policies, Revenue and Other Income Recognition and Property, Plant and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/OperatingSegmentsReportableOperatingSegmentsAndMajorCustomersDetails" id="OperatingSegmentsReportableOperatingSegmentsAndMajorCustomersDetails">
        <!--Parent Role: Operating segments-->
        <link:definition>090400 - Disclosure - Operating segments, Reportable Operating Segments and Major Customers (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/OperatingSegmentsGeographicalInformationDetails" id="OperatingSegmentsGeographicalInformationDetails">
        <!--Parent Role: Operating segments-->
        <link:definition>090402 - Disclosure - Operating segments, Geographical information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/OtherIncomeDetails" id="OtherIncomeDetails">
        <!--Parent Role: Other income-->
        <link:definition>090500 - Disclosure - Other income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/DepreciationDetails" id="DepreciationDetails">
        <!--Parent Role: Depreciation-->
        <link:definition>090600 - Disclosure - Depreciation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/OtherOperatingExpensesDetails" id="OtherOperatingExpensesDetails">
        <!--Parent Role: Other operating expenses-->
        <link:definition>090700 - Disclosure - Other operating expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinanceExpenseDetails" id="FinanceExpenseDetails">
        <!--Parent Role: Finance expense-->
        <link:definition>090800 - Disclosure - Finance expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IncomeTaxExpenseReconciliationAtStatutoryTaxRateDetails" id="IncomeTaxExpenseReconciliationAtStatutoryTaxRateDetails">
        <!--Parent Role: Income tax expense-->
        <link:definition>090900 - Disclosure - Income tax expense, Reconciliation at Statutory Tax Rate (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IncomeTaxExpenseIncomeTaxExpenseDetails" id="IncomeTaxExpenseIncomeTaxExpenseDetails">
        <!--Parent Role: Income tax expense-->
        <link:definition>090902 - Disclosure - Income tax expense, Income Tax Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IncomeTaxExpenseUnrecognizedDeferredTaxAssetsDetails" id="IncomeTaxExpenseUnrecognizedDeferredTaxAssetsDetails">
        <!--Parent Role: Income tax expense-->
        <link:definition>090904 - Disclosure - Income tax expense, Unrecognized Deferred Tax Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IncomeTaxExpenseMovementInDeferredTaxBalancesDetails" id="IncomeTaxExpenseMovementInDeferredTaxBalancesDetails">
        <!--Parent Role: Income tax expense-->
        <link:definition>090906 - Disclosure - Income tax expense, Movement in Deferred Tax Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/CashAndCashEquivalentsDetails" id="CashAndCashEquivalentsDetails">
        <!--Parent Role: Cash and cash equivalents-->
        <link:definition>091000 - Disclosure - Cash and cash equivalents (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/OtherReceivablesDetails" id="OtherReceivablesDetails">
        <!--Parent Role: Other receivables-->
        <link:definition>091100 - Disclosure - Other receivables (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/MiningHardwarePrepaymentsDetails" id="MiningHardwarePrepaymentsDetails">
        <!--Parent Role: Mining hardware prepayments-->
        <link:definition>091200 - Disclosure - Mining hardware prepayments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/PrepaymentsAndOtherAssetsDetails" id="PrepaymentsAndOtherAssetsDetails">
        <!--Parent Role: Prepayments and other assets-->
        <link:definition>091300 - Disclosure - Prepayments and other assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/PropertyPlantAndEquipmentConsolidatedDetails" id="PropertyPlantAndEquipmentConsolidatedDetails">
        <!--Parent Role: Property, plant and equipment-->
        <link:definition>091400 - Disclosure - Property, plant and equipment, Consolidated (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/PropertyPlantAndEquipmentReconciliationsOfWrittenDownValuesDetails" id="PropertyPlantAndEquipmentReconciliationsOfWrittenDownValuesDetails">
        <!--Parent Role: Property, plant and equipment-->
        <link:definition>091402 - Disclosure - Property, plant and equipment, Reconciliations of Written Down Values (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/RightofuseAssetsInformationDetails" id="RightofuseAssetsInformationDetails">
        <!--Parent Role: Right-of-use assets-->
        <link:definition>091500 - Disclosure - Right-of-use assets, Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/RightofuseAssetsReconciliationsDetails" id="RightofuseAssetsReconciliationsDetails">
        <!--Parent Role: Right-of-use assets-->
        <link:definition>091502 - Disclosure - Right-of-use assets, Reconciliations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/GoodwillAndImpairmentInformationDetails" id="GoodwillAndImpairmentInformationDetails">
        <!--Parent Role: Goodwill and impairment-->
        <link:definition>091600 - Disclosure - Goodwill and impairment, Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/GoodwillAndImpairmentReconciliationsOfGoodwillBalanceDetails" id="GoodwillAndImpairmentReconciliationsOfGoodwillBalanceDetails">
        <!--Parent Role: Goodwill and impairment-->
        <link:definition>091602 - Disclosure - Goodwill and impairment, Reconciliations of Goodwill Balance (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/GoodwillAndImpairmentReconciliationsOfImpairmentOfAssetsDetails" id="GoodwillAndImpairmentReconciliationsOfImpairmentOfAssetsDetails">
        <!--Parent Role: Goodwill and impairment-->
        <link:definition>091604 - Disclosure - Goodwill and impairment, Reconciliations of Impairment of Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/BorrowingsAndLeaseLiabilitiesComponentsOfBorrowingsDetails" id="BorrowingsAndLeaseLiabilitiesComponentsOfBorrowingsDetails">
        <!--Parent Role: Borrowings and lease liabilities-->
        <link:definition>091700 - Disclosure - Borrowings and lease liabilities, Components of Borrowings (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/BorrowingsAndLeaseLiabilitiesSummaryDetails" id="BorrowingsAndLeaseLiabilitiesSummaryDetails">
        <!--Parent Role: Borrowings and lease liabilities-->
        <link:definition>091702 - Disclosure - Borrowings and lease liabilities, Summary (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/BorrowingsAndLeaseLiabilitiesReconciliationOfLeaseLiabilitiesDetails" id="BorrowingsAndLeaseLiabilitiesReconciliationOfLeaseLiabilitiesDetails">
        <!--Parent Role: Borrowings and lease liabilities-->
        <link:definition>091704 - Disclosure - Borrowings and lease liabilities, Reconciliation of Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/ProvisionsDetails" id="ProvisionsDetails">
        <!--Parent Role: Provisions-->
        <link:definition>091800 - Disclosure - Provisions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/TradeAndOtherPayablesDetails" id="TradeAndOtherPayablesDetails">
        <!--Parent Role: Trade and other payables-->
        <link:definition>091900 - Disclosure - Trade and other payables (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IssuedCapitalOrdinarySharesDetails" id="IssuedCapitalOrdinarySharesDetails">
        <!--Parent Role: Issued capital-->
        <link:definition>092000 - Disclosure - Issued capital, Ordinary shares (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IssuedCapitalMovementsInOrdinaryShareCapitalDetails" id="IssuedCapitalMovementsInOrdinaryShareCapitalDetails">
        <!--Parent Role: Issued capital-->
        <link:definition>092002 - Disclosure - Issued capital, Movements in Ordinary Share Capital (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/IssuedCapitalSummaryDetails" id="IssuedCapitalSummaryDetails">
        <!--Parent Role: Issued capital-->
        <link:definition>092004 - Disclosure - Issued capital, Summary (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/ReservesDetails" id="ReservesDetails">
        <!--Parent Role: Reserves-->
        <link:definition>092100 - Disclosure - Reserves (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/DividendsDetails" id="DividendsDetails">
        <!--Parent Role: Dividends-->
        <link:definition>092200 - Disclosure - Dividends (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/EarningsPerShareDetails" id="EarningsPerShareDetails">
        <!--Parent Role: Earnings per share-->
        <link:definition>092300 - Disclosure - Earnings per share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinancialInstrumentsForeignCurrencyRiskDetails" id="FinancialInstrumentsForeignCurrencyRiskDetails">
        <!--Parent Role: Financial instruments-->
        <link:definition>092400 - Disclosure - Financial instruments, Foreign Currency Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinancialInstrumentsSensitivityAnalysisDetails" id="FinancialInstrumentsSensitivityAnalysisDetails">
        <!--Parent Role: Financial instruments-->
        <link:definition>092402 - Disclosure - Financial instruments, Sensitivity Analysis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinancialInstrumentsPriceRiskDetails" id="FinancialInstrumentsPriceRiskDetails">
        <!--Parent Role: Financial instruments-->
        <link:definition>092404 - Disclosure - Financial instruments, Price Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FinancialInstrumentsLiquidityRiskDetails" id="FinancialInstrumentsLiquidityRiskDetails">
        <!--Parent Role: Financial instruments-->
        <link:definition>092406 - Disclosure - Financial Instruments, Liquidity Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/FairValueMeasurementDetails" id="FairValueMeasurementDetails">
        <!--Parent Role: Fair value measurement-->
        <link:definition>092500 - Disclosure - Fair value measurement (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/CommitmentsDetails" id="CommitmentsDetails">
        <!--Parent Role: Commitments-->
        <link:definition>092600 - Disclosure - Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/InterestsInSubsidiariesDetails" id="InterestsInSubsidiariesDetails">
        <!--Parent Role: Interests in subsidiaries-->
        <link:definition>092700 - Disclosure - Interests in subsidiaries (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/ReconciliationOfLossAfterIncomeTaxToNetCashFromUsedInOperatingActivitiesDetails" id="ReconciliationOfLossAfterIncomeTaxToNetCashFromUsedInOperatingActivitiesDetails">
        <!--Parent Role: Reconciliation of loss after income tax to net cash from/(used in) operating activities-->
        <link:definition>092800 - Disclosure - Reconciliation of loss after income tax to net cash from/(used in) operating activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://irisenergy.co/role/NoncashInvestingAndFinancingActivitiesDetails" id="NoncashInvestingAndFinancingActivitiesDetails">
        <!--Parent Role: Non-cash investing and financing activities-->
        <link:definition>092900 - Disclosure - Non-cash investing and financing activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
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