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    <link:loc xlink:href="utx-20180630.xsd#utx_LongTermReceivablesFairValueDisclosure" xlink:label="loc_utx_LongTermReceivablesFairValueDisclosure_5E9818621A6F1B4267C8242B8E8D68CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_utx_LongTermReceivablesFairValueDisclosure_5E9818621A6F1B4267C8242B8E8D68CA" xlink:to="lab_utx_LongTermReceivablesFairValueDisclosure_5E9818621A6F1B4267C8242B8E8D68CA" xlink:type="arc" />
    <link:label id="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB_terseLabel_en-US" xlink:label="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer financing notes receivable</link:label>
    <link:label id="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB_label_en-US" xlink:label="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Financing Notes Receivable Fair Value Disclosure</link:label>
    <link:label id="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB_documentation_en-US" xlink:label="lab_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of customer financing notes receivable.</link:label>
    <link:loc xlink:href="utx-20180630.xsd#utx_CustomerFinancingNotesReceivableFairValueDisclosure" xlink:label="loc_utx_CustomerFinancingNotesReceivableFairValueDisclosure_4E119AA11021F6885600242B8E8EF0EB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShortTermBorrowings_7F3972EFBC213EB5E260242B8E8EC8CB_verboseLabel_en-US" xlink:label="lab_us-gaap_ShortTermBorrowings_7F3972EFBC213EB5E260242B8E8EC8CB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Short-term borrowings</link:label>
    <link:label id="lab_us-gaap_ShortTermBorrowings_7F3972EFBC213EB5E260242B8E8EC8CB_label_en-US" xlink:label="lab_us-gaap_ShortTermBorrowings_7F3972EFBC213EB5E260242B8E8EC8CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Short-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_7F3972EFBC213EB5E260242B8E8EC8CB" xlink:type="locator" />
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    <link:label id="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4_terseLabel_en-US" xlink:label="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt (excluding capitalized leases)</link:label>
    <link:label id="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4_label_en-US" xlink:label="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term debt (excluding capitalized leases) Fair Value Disclosure</link:label>
    <link:label id="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4_documentation_en-US" xlink:label="lab_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term borrowings (excluding capitalized leases).</link:label>
    <link:loc xlink:href="utx-20180630.xsd#utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure" xlink:label="loc_utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure_8BEBD3D713CCC378B741242B8E8F9EF4" xlink:type="locator" />
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    <link:label id="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E_terseLabel_en-US" xlink:label="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term liabilities</link:label>
    <link:label id="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E_label_en-US" xlink:label="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other long-term liabilities, Fair Value Disclosure</link:label>
    <link:label id="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E_documentation_en-US" xlink:label="lab_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element is used in connection with the recurring fair value measurement disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of lother long-term liabilities.</link:label>
    <link:loc xlink:href="utx-20180630.xsd#utx_OtherLongTermLiabilitiesFairValueDisclosure" xlink:label="loc_utx_OtherLongTermLiabilitiesFairValueDisclosure_56A576294B0746FD3FA7242B8E8F744E" xlink:type="locator" />
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    <link:label id="lab_utx_RemainingPerformanceObligationsAbstract_0D661DADD1B7438565A9242B8C2BA695_label_en-US" xlink:label="lab_utx_RemainingPerformanceObligationsAbstract_0D661DADD1B7438565A9242B8C2BA695" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Remaining Performance Obligations [Abstract]</link:label>
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    <link:loc xlink:href="utx-20180630.xsd#utx_RemainingPerformanceObligationsAbstract" xlink:label="loc_utx_RemainingPerformanceObligationsAbstract_0D661DADD1B7438565A9242B8C2BA695" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_utx_RemainingPerformanceObligationsAbstract_0D661DADD1B7438565A9242B8C2BA695" xlink:to="lab_utx_RemainingPerformanceObligationsAbstract_0D661DADD1B7438565A9242B8C2BA695" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_C28A1548B9F8C1DA14D0242B8C2B8656_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_C28A1548B9F8C1DA14D0242B8C2B8656" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_C28A1548B9F8C1DA14D0242B8C2B8656" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_C28A1548B9F8C1DA14D0242B8C2B8656" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTableTextBlock_C28A1548B9F8C1DA14D0242B8C2B8656" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product Warranty Liability [Table]</link:label>
    <link:label id="lab_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product Warranty Liability [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyLiabilityTable" xlink:label="loc_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF" xlink:to="lab_us-gaap_ProductWarrantyLiabilityTable_EC8C6637A3DCE9BFB5C9C891984E0AAF" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0" xlink:to="lab_us-gaap_BalanceSheetLocationAxis_C4E3DBF0B43E84C76023C891984FFAD0" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D" xlink:to="lab_us-gaap_BalanceSheetLocationDomain_77E954065D8180455F9BC891984F4F5D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product Warranty Liability [Line Items]</link:label>
    <link:label id="lab_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product Warranty Liability [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyLiabilityLineItems" xlink:label="loc_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3" xlink:to="lab_us-gaap_ProductWarrantyLiabilityLineItems_D6E1D863BD0F24A72762C891984F26B3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A_periodStartLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance as of January 1</link:label>
    <link:label id="lab_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A_label_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Standard and Extended Product Warranty Accrual</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrual" xlink:label="loc_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A" xlink:to="lab_us-gaap_ProductWarrantyAccrual_2A2B1D79F61430C36150C89198553E6A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_536CB261FC25E4872FB8C8919855A37E_terseLabel_en-US" xlink:label="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_536CB261FC25E4872FB8C8919855A37E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warranties and performance guarantees issued</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductWarrantyAccrualWarrantiesIssued" xlink:label="loc_us-gaap_ProductWarrantyAccrualWarrantiesIssued_536CB261FC25E4872FB8C8919855A37E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProductWarrantyAccrualWarrantiesIssued_536CB261FC25E4872FB8C8919855A37E" xlink:to="lab_us-gaap_ProductWarrantyAccrualWarrantiesIssued_536CB261FC25E4872FB8C8919855A37E" xlink:type="arc" />
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    <link:label id="lab_us-gaap_DebtInstrumentCallFeature_09A0D2172D25D930BF82D2CFD3EAB872_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCallFeature_09A0D2172D25D930BF82D2CFD3EAB872" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Call Feature</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCallFeature" xlink:label="loc_us-gaap_DebtInstrumentCallFeature_09A0D2172D25D930BF82D2CFD3EAB872" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_8B3C2C6ED051B8D46BE8D2CFD3EA01CD_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_8B3C2C6ED051B8D46BE8D2CFD3EA01CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Carrying Amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_8B3C2C6ED051B8D46BE8D2CFD3EA01CD_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_8B3C2C6ED051B8D46BE8D2CFD3EA01CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Gross</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentInterestRateTerms_2F5E6349A71411D2062BD2CFD3EA0C14_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateTerms_2F5E6349A71411D2062BD2CFD3EA0C14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate Terms</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateTerms_2F5E6349A71411D2062BD2CFD3EA0C14_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateTerms_2F5E6349A71411D2062BD2CFD3EA0C14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate Terms</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateTerms" xlink:label="loc_us-gaap_DebtInstrumentInterestRateTerms_2F5E6349A71411D2062BD2CFD3EA0C14" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherLoansPayable_8CFA3557E2F50752431AD2CFD3EA1A80_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLoansPayable_8CFA3557E2F50752431AD2CFD3EA1A80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Project financing obligations</link:label>
    <link:label id="lab_us-gaap_OtherLoansPayable_8CFA3557E2F50752431AD2CFD3EA1A80_label_en-US" xlink:label="lab_us-gaap_OtherLoansPayable_8CFA3557E2F50752431AD2CFD3EA1A80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Loans Payable</link:label>
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    <link:label id="lab_us-gaap_OtherLongTermDebt_E7F4D95BF416922ACC45D2CFD3EA7C30_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLongTermDebt_E7F4D95BF416922ACC45D2CFD3EA7C30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other (including capitalized leases)</link:label>
    <link:label id="lab_us-gaap_OtherLongTermDebt_E7F4D95BF416922ACC45D2CFD3EA7C30_label_en-US" xlink:label="lab_us-gaap_OtherLongTermDebt_E7F4D95BF416922ACC45D2CFD3EA7C30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long-term Debt</link:label>
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    <link:label id="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6_terseLabel_en-US" xlink:label="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total principal long-term debt</link:label>
    <link:label id="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6_label_en-US" xlink:label="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Principal Long-Term Debt</link:label>
    <link:label id="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6_documentation_en-US" xlink:label="lab_utx_PrincipalLongTermDebt_39164139F1831B10ACD6D2CFD3EAF8D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Including both current and noncurrent portions, carrying amount as of the balance-sheet date principal debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.</link:label>
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    <link:label id="lab_utx_OtherLongTermDebtFairMarketValueAdjustments_5BBEDDC3BA66B91F7434D2CFD3EA55DB_terseLabel_en-US" xlink:label="lab_utx_OtherLongTermDebtFairMarketValueAdjustments_5BBEDDC3BA66B91F7434D2CFD3EA55DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other (fair market value adjustments and discounts)</link:label>
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    <link:label id="lab_utx_OtherLongTermDebtFairMarketValueAdjustments_5BBEDDC3BA66B91F7434D2CFD3EA55DB_documentation_en-US" xlink:label="lab_utx_OtherLongTermDebtFairMarketValueAdjustments_5BBEDDC3BA66B91F7434D2CFD3EA55DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Including both current and noncurrent portions, fair market value adjustments of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_48925FCC6F05E2169A62D2CFD3EA1CF6_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_48925FCC6F05E2169A62D2CFD3EA1CF6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total long-term debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_48925FCC6F05E2169A62D2CFD3EA1CF6_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_48925FCC6F05E2169A62D2CFD3EA1CF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt and Capital Lease Obligations, Including Current Maturities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_48925FCC6F05E2169A62D2CFD3EA1CF6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_1CEB99FE1E1F0963AA08D2CFD3EA7DAA_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_1CEB99FE1E1F0963AA08D2CFD3EA7DAA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Less: current portion</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_1CEB99FE1E1F0963AA08D2CFD3EA7DAA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_60035C2F9DF08F6FC9FAD2CFD3EAE376_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_60035C2F9DF08F6FC9FAD2CFD3EAE376" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt, net of current portion</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_60035C2F9DF08F6FC9FAD2CFD3EAE376" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_42AA3E7661C8F887FD52CDE78333997B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_42AA3E7661C8F887FD52CDE78333997B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Segment Reporting Information, by Segment [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_PensionContributions_0B81C34F7D2DBADF8A9ED76EFEBF2D11_label_en-US" xlink:label="lab_us-gaap_PensionContributions_0B81C34F7D2DBADF8A9ED76EFEBF2D11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment for Pension Benefits</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInRoyaltiesPayable_EEE585BC06120AAB6A00D76EFEBFF74F_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRoyaltiesPayable_EEE585BC06120AAB6A00D76EFEBFF74F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Canadian Government Settlement</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_D49E96E664FA98DCF750D76EFEBF4F02" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_AE5322E6094C1709C51CD76EFEBF79E8_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_AE5322E6094C1709C51CD76EFEBF79E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments in businesses</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_AE5322E6094C1709C51CD76EFEBF79E8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireFinanceReceivables_6C1B0E6C631DA9C487E1D76EFEBFEB96_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireFinanceReceivables_6C1B0E6C631DA9C487E1D76EFEBFEB96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase in customer financing assets</link:label>
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