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    <link:label id="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial real estate [Member]</link:label>
    <link:label id="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB_label_en-US" xlink:label="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Real Estate Portfolio Segment [Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB" xlink:to="lab_us-gaap_CommercialRealEstatePortfolioSegmentMember_137C76E04096747BE1E1E03DAE3786FB" xlink:type="arc" />
    <link:label id="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D_terseLabel_en-US" xlink:label="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans to individuals [Member]</link:label>
    <link:label id="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D_label_en-US" xlink:label="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans to individuals [Member]</link:label>
    <link:label id="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D_documentation_en-US" xlink:label="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Portfolio segment of the company's total financing receivables related to loans to individuals.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D" xlink:to="lab_bokf_LoanstoindividualsMember_B7746EB13FDD2490AC77E03DAE378A2D" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_E240E3D933071C9E52D5E03DAE37A6D2_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_E240E3D933071C9E52D5E03DAE37A6D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Axis]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_E240E3D933071C9E52D5E03DAE37A6D2_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_E240E3D933071C9E52D5E03DAE37A6D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_E240E3D933071C9E52D5E03DAE37A6D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_09144FC16E4DB3C26C35E03DAE37A612_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_09144FC16E4DB3C26C35E03DAE37A612" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Domain]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_09144FC16E4DB3C26C35E03DAE37A612_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_09144FC16E4DB3C26C35E03DAE37A612" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Financing Receivable [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_09144FC16E4DB3C26C35E03DAE37A612" xlink:type="locator" />
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    <link:label id="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B_terseLabel_en-US" xlink:label="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Energy [Member]</link:label>
    <link:label id="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B_label_en-US" xlink:label="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Energy [Member]</link:label>
    <link:label id="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B_documentation_en-US" xlink:label="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to energy industry</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_EnergyMember" xlink:label="loc_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:to="lab_bokf_EnergyMember_5A4B098DEF0C7DDC5FBFE03DAE37DD7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039_terseLabel_en-US" xlink:label="lab_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Healthcare [Member]</link:label>
    <link:label id="lab_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039_label_en-US" xlink:label="lab_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Health Care [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HealthCareMember" xlink:label="loc_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039" xlink:to="lab_us-gaap_HealthCareMember_9AA62E97F86130AEE64AE03DAE38F039" xlink:type="arc" />
    <link:label id="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670_terseLabel_en-US" xlink:label="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Services [Member]</link:label>
    <link:label id="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670_label_en-US" xlink:label="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Services [Member]</link:label>
    <link:label id="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670_documentation_en-US" xlink:label="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to services industry</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicesMember" xlink:label="loc_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:to="lab_bokf_ServicesMember_9C9534A326F36CD9BDB1E03DAE38D670" xlink:type="arc" />
    <link:label id="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D_terseLabel_en-US" xlink:label="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General business [Member]</link:label>
    <link:label id="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D_label_en-US" xlink:label="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General business member [Member]</link:label>
    <link:label id="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D_documentation_en-US" xlink:label="lab_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">General business member [Member]</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_GeneralbusinessmemberMember" xlink:label="loc_bokf_GeneralbusinessmemberMember_4A9169263C24BF745555E03DAE38DF4D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554_terseLabel_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage [Member]</link:label>
    <link:label id="lab_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554_label_en-US" xlink:label="lab_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResidentialPortfolioSegmentMember" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554" xlink:to="lab_us-gaap_ResidentialPortfolioSegmentMember_0907F56051A793D27F28E03DAE38A554" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0_terseLabel_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Personal [Member]</link:label>
    <link:label id="lab_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0_label_en-US" xlink:label="lab_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consumer Portfolio Segment [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsumerPortfolioSegmentMember" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0" xlink:to="lab_us-gaap_ConsumerPortfolioSegmentMember_E4DFAE03970E3FEA5199E03DAE3803A0" xlink:type="arc" />
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    <link:label id="lab_us-gaap_FinancingReceivableNonaccrualStatusLineItems_E8C6B63C416CFAB7527CE03DAE38DEA3_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableNonaccrualStatusLineItems_E8C6B63C416CFAB7527CE03DAE38DEA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Nonaccrual [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableNonaccrualStatusLineItems" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_E8C6B63C416CFAB7527CE03DAE38DEA3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_82CD0E5A1D6FC851EE6BE03DAE38FF53" xlink:type="locator" />
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    <link:label id="lab_bokf_FinancingReceivableNonaccrualWithAllowance_4189C728129EAB534B6DE03DAE38EBAD_documentation_en-US" xlink:label="lab_bokf_FinancingReceivableNonaccrualWithAllowance_4189C728129EAB534B6DE03DAE38EBAD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of financing receivable on nonaccrual status with an allowance.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_FinancingReceivableNonaccrualWithAllowance" xlink:label="loc_bokf_FinancingReceivableNonaccrualWithAllowance_4189C728129EAB534B6DE03DAE38EBAD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_FinancingReceivableNonaccrualWithAllowance_4189C728129EAB534B6DE03DAE38EBAD" xlink:to="lab_bokf_FinancingReceivableNonaccrualWithAllowance_4189C728129EAB534B6DE03DAE38EBAD" xlink:type="arc" />
    <link:label id="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292_terseLabel_en-US" xlink:label="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Nonaccrual, Related Allowance</link:label>
    <link:label id="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292_label_en-US" xlink:label="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Nonaccrual, Related Allowance</link:label>
    <link:label id="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292_documentation_en-US" xlink:label="lab_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of financing receivable on nonaccrual status with a related allowance.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_FinancingReceivableNonaccrualRelatedAllowance" xlink:label="loc_bokf_FinancingReceivableNonaccrualRelatedAllowance_42C7D81C82BE219C5ABFE03DAE38D292" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerAbstract_63EB962B6546B461ED4E1F88D5497C59_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerAbstract_BCD80599ECAE5C9788A6ADE6F23E539B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_BCD80599ECAE5C9788A6ADE6F23E539B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_1E177BB48A1EB12B391E1F88D5493A3B_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_32C437B9B95C50278A9E3896E6AA0991" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_32C437B9B95C50278A9E3896E6AA0991" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_32C437B9B95C50278A9E3896E6AA0991" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerTextBlock_32C437B9B95C50278A9E3896E6AA0991" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_9D7699E88FA33FB673ECE03DAC4ECF0A_label_en-US" xlink:label="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_9D7699E88FA33FB673ECE03DAC4ECF0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans and Leases Receivable, Net Amount [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_9D7699E88FA33FB673ECE03DAC4ECF0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_9D7699E88FA33FB673ECE03DAC4ECF0A" xlink:to="lab_us-gaap_LoansAndLeasesReceivableNetReportedAmountAbstract_9D7699E88FA33FB673ECE03DAC4ECF0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Impaired Loans [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Impaired Financing Receivable [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfImpairedFinancingReceivableTable" xlink:label="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9" xlink:to="lab_us-gaap_ScheduleOfImpairedFinancingReceivableTable_EB939E54C86E5E4087B9E03DAC579FA9" xlink:type="arc" />
    <link:label id="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F_terseLabel_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wholesale/retail [Member]</link:label>
    <link:label id="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F_label_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wholesale and retail [Member]</link:label>
    <link:label id="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F_documentation_en-US" xlink:label="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to wholesale/retail industry.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_WholesaleAndRetailMember" xlink:label="loc_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:to="lab_bokf_WholesaleAndRetailMember_A2E37492230D320459A7E03DAC5BDE2F" xlink:type="arc" />
    <link:label id="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979_terseLabel_en-US" xlink:label="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Manufacturing [Member]</link:label>
    <link:label id="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979_label_en-US" xlink:label="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Manufacturing [Member]</link:label>
    <link:label id="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979_documentation_en-US" xlink:label="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to manufacturing industry.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ManufacturingMember" xlink:label="loc_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:to="lab_bokf_ManufacturingMember_2D787F65B1CD1DDFEACAE03DAC5B6979" xlink:type="arc" />
    <link:label id="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4_terseLabel_en-US" xlink:label="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public finance [Member]</link:label>
    <link:label id="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4_label_en-US" xlink:label="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Finance [Member]</link:label>
    <link:label id="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4_documentation_en-US" xlink:label="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to public finance</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_PublicFinanceMember" xlink:label="loc_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:to="lab_bokf_PublicFinanceMember_BD40059FD35FA551E1C0E03DAC6127E4" xlink:type="arc" />
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B_terseLabel_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other commercial and industrial [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B_label_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commercial and Industrial [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B_documentation_en-US" xlink:label="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to other commercial and industrial industry.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_OtherCommercialAndIndustrialMember" xlink:label="loc_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:to="lab_bokf_OtherCommercialAndIndustrialMember_018A05158D2FFCB5A49EE03DAC618A6B" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA_terseLabel_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA_label_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:label id="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA_documentation_en-US" xlink:label="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential construction and land development [Member]</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialconstructionandlanddevelopmentMember" xlink:label="loc_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:to="lab_bokf_ResidentialconstructionandlanddevelopmentMember_2785888E246AE9D5E39AE03DAC61B4CA" xlink:type="arc" />
    <link:label id="lab_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A_terseLabel_en-US" xlink:label="lab_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retail [Member]</link:label>
    <link:label id="lab_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A_label_en-US" xlink:label="lab_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retail [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetailMember" xlink:label="loc_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A" xlink:to="lab_us-gaap_RetailMember_3555992EC4E4DF8BA7BDE03DAC61303A" xlink:type="arc" />
    <link:label id="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511_terseLabel_en-US" xlink:label="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Office [Member]</link:label>
    <link:label id="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511_label_en-US" xlink:label="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Office [Member]</link:label>
    <link:label id="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511_documentation_en-US" xlink:label="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related for which repayment will come from the sale or rental of office space.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_OfficeMember" xlink:label="loc_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:to="lab_bokf_OfficeMember_1AF3A79799731B539038E03DAC614511" xlink:type="arc" />
    <link:label id="lab_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108_terseLabel_en-US" xlink:label="lab_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Multifamily [Member]</link:label>
    <link:label id="lab_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108_label_en-US" xlink:label="lab_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Multifamily [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MultifamilyMember" xlink:label="loc_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108" xlink:to="lab_srt_MultifamilyMember_5C551E7C8B28C2FE4A64E03DAC619108" xlink:type="arc" />
    <link:label id="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742_terseLabel_en-US" xlink:label="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742_label_en-US" xlink:label="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742_documentation_en-US" xlink:label="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables for which repayment will come from the sale or rental of industrial facilities.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742" xlink:to="lab_bokf_IndustrialMember_04DB214A7535A92D7EDCE03DAC621742" xlink:type="arc" />
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F_terseLabel_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other commercial real estate [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F_label_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commercial Real Estate [Member]</link:label>
    <link:label id="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F_documentation_en-US" xlink:label="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables for which repyament is expected from the sale or rental of other commercial real estate properties.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_OtherCommercialRealEstateMember" xlink:label="loc_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:to="lab_bokf_OtherCommercialRealEstateMember_A8F7014B8268F9DAB43BE03DAC627D4F" xlink:type="arc" />
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4_terseLabel_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Permanent Residential Mortgage [Member]</link:label>
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4_label_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Permanent Residential Mortgage [Member]</link:label>
    <link:label id="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4_documentation_en-US" xlink:label="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class of financing receivables related to mortgages of permanent residences.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_PermanentResidentialMortgageMember" xlink:label="loc_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:to="lab_bokf_PermanentResidentialMortgageMember_F21574D6377880BC80CFE03DAC62D4F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF_terseLabel_en-US" xlink:label="lab_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home equity [Member]</link:label>
    <link:label id="lab_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF_label_en-US" xlink:label="lab_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Home Equity Line of Credit [Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF" xlink:to="lab_us-gaap_HomeEquityMember_DC078FB227202CC6754AE03DAC624FDF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Impaired [Line Items]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Impaired [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableImpairedLineItems" xlink:label="loc_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404" xlink:to="lab_us-gaap_FinancingReceivableImpairedLineItems_3320C18378F2CED2D94FE03DAC635404" xlink:type="arc" />
    <link:label id="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_DC98053DAF8375BEACAEE03DAC634F42_terseLabel_en-US" xlink:label="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_DC98053DAF8375BEACAEE03DAC634F42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans [Abstract]</link:label>
    <link:label id="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_DC98053DAF8375BEACAEE03DAC634F42_label_en-US" xlink:label="lab_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_DC98053DAF8375BEACAEE03DAC634F42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loan and Lease Receivables, Impaired [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LoanAndLeaseReceivablesImpairedAbstract" xlink:label="loc_us-gaap_LoanAndLeaseReceivablesImpairedAbstract_DC98053DAF8375BEACAEE03DAC634F42" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, unpaid principal balance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, Unpaid Principal Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6" xlink:to="lab_us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance_83A99DC656D78048A38CE03DAC6478B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1_totalLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, recorded investment, total</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, Recorded Investment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1" xlink:to="lab_us-gaap_ImpairedFinancingReceivableRecordedInvestment_CA048BE7189DD30F13B4E03DAC64F2B1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, recorded investment with no related allowance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, with No Related Allowance, Recorded Investment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6" xlink:to="lab_us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment_34138235CD7EA3623D95E03DAC6484C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, recorded investment with related allowance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, with Related Allowance, Recorded Investment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment" xlink:label="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3" xlink:to="lab_us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment_36F997C734EBB9D6AFD0E03DAC646CC3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_1DC7841CBAFBAA7229C2E03DAC6407FA_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_1DC7841CBAFBAA7229C2E03DAC6407FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impaired loans, related allowance</link:label>
    <link:label id="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_1DC7841CBAFBAA7229C2E03DAC6407FA_label_en-US" xlink:label="lab_us-gaap_ImpairedFinancingReceivableRelatedAllowance_1DC7841CBAFBAA7229C2E03DAC6407FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Impaired Financing Receivable, Related Allowance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairedFinancingReceivableRelatedAllowance" xlink:label="loc_us-gaap_ImpairedFinancingReceivableRelatedAllowance_1DC7841CBAFBAA7229C2E03DAC6407FA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_7D389101469DC5C809E0C7B05BA2C037_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_7D389101469DC5C809E0C7B05BA2C037" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_7D389101469DC5C809E0C7B05BA2C037" xlink:type="locator" />
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    <link:label id="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6_verboseLabel_en-US" xlink:label="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Numerator: [Abstract]</link:label>
    <link:label id="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6_label_en-US" xlink:label="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Numerator: [Abstract]</link:label>
    <link:label id="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6_documentation_en-US" xlink:label="lab_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_NumeratorAbstract" xlink:label="loc_bokf_NumeratorAbstract_8944159BEF310F6A6820C7B05BA269F6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetIncomeLoss_FFBBB3EA2E0A39B035D5C7B05BA2E19F_verboseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_FFBBB3EA2E0A39B035D5C7B05BA2E19F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net income attributable to BOK Financial Corp. shareholders</link:label>
    <link:label id="lab_us-gaap_NetIncomeLoss_FFBBB3EA2E0A39B035D5C7B05BA2E19F_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_FFBBB3EA2E0A39B035D5C7B05BA2E19F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_0585EA26F8EEC91632E1C7B05BA2EC2F_terseLabel_en-US" xlink:label="lab_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_0585EA26F8EEC91632E1C7B05BA2EC2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less: Earnings allocated to participating securities</link:label>
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    <link:label id="lab_bokf_GainOnFairValueOptionSecuritiesNet_74E61C36262DC4B92F22C2AF8E160CF5_terseLabel_en-US" xlink:label="lab_bokf_GainOnFairValueOptionSecuritiesNet_74E61C36262DC4B92F22C2AF8E160CF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on fair value option securities, net</link:label>
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    <link:label id="lab_bokf_NIRexpensefrominternalsources_AD437D063D1E0D5CB1CFCBAC3C4753FD_documentation_en-US" xlink:label="lab_bokf_NIRexpensefrominternalsources_AD437D063D1E0D5CB1CFCBAC3C4753FD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of interest revenue earned or paid on funds loaned to or borrowed from the funds management unit net of interest expense (cost of borrowed funds accounted for as interest) from internal sources.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_NIRexpensefrominternalsources" xlink:label="loc_bokf_NIRexpensefrominternalsources_AD437D063D1E0D5CB1CFCBAC3C4753FD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_3250B6C8160A590EFCE1CBAC3C475D7D_terseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_3250B6C8160A590EFCE1CBAC3C475D7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net interest revenue after provision for credit losses</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_3250B6C8160A590EFCE1CBAC3C475D7D" xlink:to="lab_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_3250B6C8160A590EFCE1CBAC3C475D7D" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoninterestIncome_2BD95C768E6EFB1DD1DACBAC3C47E74F_verboseLabel_en-US" xlink:label="lab_us-gaap_NoninterestIncome_2BD95C768E6EFB1DD1DACBAC3C47E74F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other operating revenue</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoninterestIncome" xlink:label="loc_us-gaap_NoninterestIncome_2BD95C768E6EFB1DD1DACBAC3C47E74F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NoninterestExpense_FA05EB39AFF31B7A3DFFCBAC3C471066_verboseLabel_en-US" xlink:label="lab_us-gaap_NoninterestExpense_FA05EB39AFF31B7A3DFFCBAC3C471066" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other operating expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoninterestExpense" xlink:label="loc_us-gaap_NoninterestExpense_FA05EB39AFF31B7A3DFFCBAC3C471066" xlink:type="locator" />
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    <link:label id="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2_totalLabel_en-US" xlink:label="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net direct contribution</link:label>
    <link:label id="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2_label_en-US" xlink:label="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net direct contribution</link:label>
    <link:label id="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2_documentation_en-US" xlink:label="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net direct contribution of segments prior to corporate expense allocations.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Netdirectcontribution" xlink:label="loc_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:to="lab_bokf_Netdirectcontribution_DBB64C6CCBA2F2BE51F7CBAC3C48F6E2" xlink:type="arc" />
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12_terseLabel_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on financial instruments, net</link:label>
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12_label_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Financial Instruments, Net</link:label>
    <link:label id="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12_documentation_en-US" xlink:label="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents gain (loss) on financial instruments, net, used for segment reporting purposes on a summary basis. Includes those gains and losses from derivative contracts, fair value option securities and available for sale securities. Also includes in other-than-temporary impairment losses recognized in earnings.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_GainLossonFinancialInstrumentsNet" xlink:label="loc_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:to="lab_bokf_GainLossonFinancialInstrumentsNet_18FD4BB444978AD719E9CBAC3C48CE12" xlink:type="arc" />
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4_terseLabel_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage servicing rights</link:label>
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4_label_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Change in Fair Value of Mortgage Servicing Rights</link:label>
    <link:label id="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4_documentation_en-US" xlink:label="lab_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in the fair value of mortgage servicing rights used for segment reporting purposes.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_SegmentReportingChangeinFairValueofMortgageServicingRights" xlink:label="loc_bokf_SegmentReportingChangeinFairValueofMortgageServicingRights_0F8FEF043DC10AE9ACD5CBAC3C4898E4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain (loss) on repossessed assets, net</link:label>
    <link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1_label_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Assets and Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1" xlink:to="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_E73683D919A5831A54D7CBAC3C485DF1" xlink:type="arc" />
    <link:label id="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47_terseLabel_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate expense allocations</link:label>
    <link:label id="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47_label_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate Expense Allocations</link:label>
    <link:label id="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47_documentation_en-US" xlink:label="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent allocation of corporate expenses to segments</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_CorporateExpenseAllocations" xlink:label="loc_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:to="lab_bokf_CorporateExpenseAllocations_99CF3D243F2C795087C1CBAC3C48AC47" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_183E1063EC763D35E877CBAC3C49E2B1_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_183E1063EC763D35E877CBAC3C49E2B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income attributable to non-controlling interests</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_183E1063EC763D35E877CBAC3C49E2B1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_183E1063EC763D35E877CBAC3C49E2B1" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_183E1063EC763D35E877CBAC3C49E2B1" xlink:type="arc" />
    <link:label id="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9_terseLabel_en-US" xlink:label="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average assets</link:label>
    <link:label id="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9_label_en-US" xlink:label="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Average Assets for Reporting Period</link:label>
    <link:label id="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9_documentation_en-US" xlink:label="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of average assets attributed to the reportable segment for the reporting period.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_AverageAssetsForReportingPeriod" xlink:label="loc_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:to="lab_bokf_AverageAssetsForReportingPeriod_1E0E8EDE99FAD3AA4CE9CBAC3C4923E9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_B910F7D7E455485671321F88D3CAE778_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_64D139893B5C5E58836B18FF386F220C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Fees and Commissions Revenue [Table Text Block]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_64D139893B5C5E58836B18FF386F220C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_64D139893B5C5E58836B18FF386F220C" xlink:to="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_64D139893B5C5E58836B18FF386F220C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_3A6D322278C61CCACCB71F88D3F9D918_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_0C776824C8955F36AD569D23E9A79B19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Assets And Liabilities Measured On A Recurring Basis [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_3A6D322278C61CCACCB71F88D3F9D918_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_0C776824C8955F36AD569D23E9A79B19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_0C776824C8955F36AD569D23E9A79B19" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_0C776824C8955F36AD569D23E9A79B19" xlink:to="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_0C776824C8955F36AD569D23E9A79B19" xlink:type="arc" />
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    <link:label id="lab_bokf_QuotedpricesofloanssoldinsecuritizationtransactionswithaliquiditydiscountappliedMember_FA5367B9AD6F90AF9ABB4340C083AA63_terseLabel_en-US" xlink:label="lab_bokf_QuotedpricesofloanssoldinsecuritizationtransactionswithaliquiditydiscountappliedMember_A659BEF065DC5C8E84DA496247D62EE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Quoted prices of loans sold in securitization transactions, with a liquidity discount applied [Member]</link:label>
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    <link:label id="lab_us-gaap_AvailableforsaleSecuritiesMember_85BF0F28B9BC5625EA914340C0855A88_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableforsaleSecuritiesMember_F8FD588100555814ADF44AEBD98E5E2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available-for-sale securities [Member]</link:label>
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    <link:label id="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_93A96BC31448D09518B44340C086FA67_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_F1589EB6D78A56B0A6E2B6AA91625F36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale [Member]</link:label>
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    <link:label id="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_93A96BC31448D09518B44340C086FA67_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldforSaleMember_F1589EB6D78A56B0A6E2B6AA91625F36" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents financial statement line item Residential Mortgage Loans Held for Sale</link:label>
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    <link:label id="lab_bokf_Rangeoffairvalueasapercentageofpartvalue_758F0D537ADF3B24DE034340C087A115_terseLabel_en-US" xlink:label="lab_bokf_Rangeoffairvalueasapercentageofpartvalue_CC161969470959BFA3C5DE5E5F4EF622" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range of fair value as a percentage of par value</link:label>
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    <link:label id="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_4DBDE614899289F5B8714340C087D3CF_terseLabel_en-US" xlink:label="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_00CA5A5686DC5300B5CA70E8692101E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average Yields On Comparable Short-term Taxable Securities Maximum</link:label>
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    <link:label id="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_4DBDE614899289F5B8714340C087D3CF_documentation_en-US" xlink:label="lab_bokf_AverageYieldsOnComparableShortTermTaxableSecuritiesMaximum_00CA5A5686DC5300B5CA70E8692101E0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The average rate of yield for comparable short-term investment grade taxable security.</link:label>
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    <link:label id="lab_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Notional</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Notional Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityNotionalAmount" xlink:label="loc_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6" xlink:to="lab_us-gaap_DerivativeLiabilityNotionalAmount_782F730F5A081EB5E1C9E052CAAB65B6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Fair Value, Net [Abstract]</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A" xlink:to="lab_us-gaap_DerivativeAssetFairValueNetAbstract_9366BF0B8FF02A18E1BBE052CAAB891A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Gross Fair Value</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Fair Value, Gross Asset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeAsset_192FA0279DB9F2E71B8BE052CAABE910" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45_negatedTerseLabel_en-US" xlink:label="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45_label_en-US" xlink:label="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45_documentation_en-US" xlink:label="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of gross derivative asset positions offset by gross derivate liability due to enforceable master netting or similar agreements.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_DerivativeAssetNettingAdjustments" xlink:label="loc_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:to="lab_bokf_DerivativeAssetNettingAdjustments_BB7C1BE0C177BDBB1DEAE052CAAB7F45" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4_totalLabel_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4_label_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Assets, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4_documentation_en-US" xlink:label="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net derivative assets before offsetting the obligation to return cash collateral under a master netting or similar arrangement.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_DerivativeAssetsNetFairValueBeforeCashCollateral" xlink:label="loc_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:to="lab_bokf_DerivativeAssetsNetFairValueBeforeCashCollateral_A4043779FD512B3C850FE052CAABC7D4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Assets, Cash Collateral</link:label>
    <link:label id="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7_label_en-US" xlink:label="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Asset, Collateral, Obligation to Return Cash, Offset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7" xlink:to="lab_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_FC57B6FFE9BF8E72D1D6E052CAABA1F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeAssets_E27626728DC45DC6BB88E052CAAB9EE6_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssets_E27626728DC45DC6BB88E052CAAB9EE6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derviative contracts, net of cash collateral, Assets, Fair value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_E27626728DC45DC6BB88E052CAAB9EE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeAssets_E27626728DC45DC6BB88E052CAAB9EE6" xlink:to="lab_us-gaap_DerivativeAssets_E27626728DC45DC6BB88E052CAAB9EE6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Fair Value, Net [Abstract]</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityFairValueNetAbstract" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85" xlink:to="lab_us-gaap_DerivativeLiabilityFairValueNetAbstract_FC590C5234B1B5EBF3AEE052CAABBD85" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Gross Fair Value</link:label>
    <link:label id="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17_label_en-US" xlink:label="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Fair Value, Gross Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_A0759245A49B270145FDE052CAABDB17" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59_negatedTerseLabel_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59_label_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Netting Adjustments</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59_documentation_en-US" xlink:label="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents amount of gross derivative liability positions offset by gross derivative asset positions due to enforceable master netting or similar arrangements.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_DerivativeLiabilityNettingAdjustments" xlink:label="loc_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:to="lab_bokf_DerivativeLiabilityNettingAdjustments_B045B99A766D407071BDE052CAABCA59" xlink:type="arc" />
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E_totalLabel_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E_label_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Net Fair Value Before Cash Collateral</link:label>
    <link:label id="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E_documentation_en-US" xlink:label="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents net derivative liability before consideration of right to reclasim cash collateral under master netting or similar arrangements.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral" xlink:label="loc_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:to="lab_bokf_DerivativeLiabilityNetFairValueBeforeCashCollateral_9F73070741A99F9E49B0E052CAABC94E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Cash Collateral</link:label>
    <link:label id="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389_label_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Derivative Liability, Collateral, Right to Reclaim Cash, Offset</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389" xlink:to="lab_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_43B912CE15A7F2392C47E052CAAB0389" xlink:type="arc" />
    <link:label id="lab_us-gaap_DerivativeLiabilities_49C193A93119C32BFCD9E052CAAB045E_totalLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilities_49C193A93119C32BFCD9E052CAAB045E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Derivative Liabilities, Fair Value, Net of Cash Collateral</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_49C193A93119C32BFCD9E052CAAB045E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeLiabilities_49C193A93119C32BFCD9E052CAAB045E" xlink:to="lab_us-gaap_DerivativeLiabilities_49C193A93119C32BFCD9E052CAAB045E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_8C891F06EE70372589A1E052C8F33B46_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable_8C891F06EE70372589A1E052C8F33B46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTable_8C891F06EE70372589A1E052C8F33B46_label_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTable_8C891F06EE70372589A1E052C8F33B46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, by Balance Sheet Grouping [Table]</link:label>
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    <link:label id="lab_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_5A9087AA3784AEF076B11312851F3528_terseLabel_en-US" xlink:label="lab_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_21717EB6ACEE52A0B29B7DFF82F77D96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Available For Sale Securities [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_5A9087AA3784AEF076B11312851F3528_label_en-US" xlink:label="lab_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_21717EB6ACEE52A0B29B7DFF82F77D96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Securities, Available-for-sale [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_21717EB6ACEE52A0B29B7DFF82F77D96" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_21717EB6ACEE52A0B29B7DFF82F77D96" xlink:to="lab_us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_21717EB6ACEE52A0B29B7DFF82F77D96" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_5DBBE3B35B3DB19947071312851F50DE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_60421FFC8E2C591E9220AA8D8FA592F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_5DBBE3B35B3DB19947071312851F50DE_label_en-US" xlink:label="lab_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_60421FFC8E2C591E9220AA8D8FA592F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_60421FFC8E2C591E9220AA8D8FA592F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_60421FFC8E2C591E9220AA8D8FA592F5" xlink:to="lab_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_60421FFC8E2C591E9220AA8D8FA592F5" xlink:type="arc" />
    <link:label id="lab_bokf_FairValueOptionSecuritiesTableTextBlock_A27798FDF77AF1CCCBA3131883A91179_terseLabel_en-US" xlink:label="lab_bokf_FairValueOptionSecuritiesTableTextBlock_BBB9AD78A608584A95E0838C2DDF0B46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Option Securities [Table Text Block]</link:label>
    <link:label id="lab_bokf_FairValueOptionSecuritiesTableTextBlock_A27798FDF77AF1CCCBA3131883A91179_label_en-US" xlink:label="lab_bokf_FairValueOptionSecuritiesTableTextBlock_BBB9AD78A608584A95E0838C2DDF0B46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Option Securities [Table Text Block]</link:label>
    <link:label id="lab_bokf_FairValueOptionSecuritiesTableTextBlock_A27798FDF77AF1CCCBA3131883A91179_documentation_en-US" xlink:label="lab_bokf_FairValueOptionSecuritiesTableTextBlock_BBB9AD78A608584A95E0838C2DDF0B46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Table Text Block] for Fair Value Option Securities [Table]</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_FairValueOptionSecuritiesTableTextBlock" xlink:label="loc_bokf_FairValueOptionSecuritiesTableTextBlock_BBB9AD78A608584A95E0838C2DDF0B46" xlink:type="locator" />
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    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F_terseLabel_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Mortgage Servicing Rights [Abstract]</link:label>
    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F_label_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Mortgage Servicing Rights [Abstract]</link:label>
    <link:label id="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F_documentation_en-US" xlink:label="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_SummaryOfMortgageServicingRightsAbstract" xlink:label="loc_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:to="lab_bokf_SummaryOfMortgageServicingRightsAbstract_E1B618C7EC3C61B02210C281C8BD160F" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6_verboseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of residential mortgage loans serviced for others</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Number Of Loans</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Indicates the number of mortgage loans being serviced.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialMortgageLoansServicedNumberOfLoans" xlink:label="loc_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:to="lab_bokf_ResidentialMortgageLoansServicedNumberOfLoans_C8C4956B50B55CEE7BF8C281C8BE35D6" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B_verboseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Outstanding principal balance of residential mortgage loans serviced for others</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Outstanding Principal</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Dollar amount of principal outstanding on mortgage loans being serviced.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialMortgageLoansServicedOutstandingPrincipal" xlink:label="loc_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:to="lab_bokf_ResidentialMortgageLoansServicedOutstandingPrincipal_DF1385E2D3829FA07F37C281C8C6702B" xlink:type="arc" />
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A_terseLabel_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate</link:label>
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A_label_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Interest Rate of Loans Serviced for Others</link:label>
    <link:label id="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A_documentation_en-US" xlink:label="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the weighted average interest rate of loans servicedf for others as of the balance sheet date.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_WeightedAverageInterestRateofLoansServicedforOthers" xlink:label="loc_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:to="lab_bokf_WeightedAverageInterestRateofLoansServicedforOthers_207FDABF0DB1FA9AC537C281C8C7851A" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining term (in months)</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loans Serviced Weighted Average Remaining Term</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the weighted average remaining term of mortgage loans being serviced fro others.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm" xlink:label="loc_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:to="lab_bokf_ResidentialMortgageLoansServicedWeightedAverageRemainingTerm_758BF6576C51615FACA1C281C8C77CB4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_6DB419B3121C75DDF97BC281C8C7BF53_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_6DB419B3121C75DDF97BC281C8C7BF53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Amount [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_6DB419B3121C75DDF97BC281C8C7BF53_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmountRollForward_6DB419B3121C75DDF97BC281C8C7BF53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Amount [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmountRollForward" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_6DB419B3121C75DDF97BC281C8C7BF53" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAmount_47CF7D96FCE6B48D29BFC281C8C7FE95_periodStartLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAmount_47CF7D96FCE6B48D29BFC281C8C7FE95" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ServicingAssetAtFairValueAmount" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_47CF7D96FCE6B48D29BFC281C8C7FE95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmount_47CF7D96FCE6B48D29BFC281C8C7FE95" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAmount_47CF7D96FCE6B48D29BFC281C8C7FE95" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions, net</link:label>
    <link:label id="lab_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD_label_en-US" xlink:label="lab_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Asset at Fair Value, Additions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ServicingAssetAtFairValueAdditions" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD" xlink:to="lab_us-gaap_ServicingAssetAtFairValueAdditions_FD1F2F3759383A00A473C281C8C8A9FD" xlink:type="arc" />
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147_terseLabel_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value due to principal payments</link:label>
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147_label_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in fair value due to loan runoff</link:label>
    <link:label id="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147_documentation_en-US" xlink:label="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The decrease in fair value as a result of loan runoff.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ChangeInFairValueDueToLoanRunoff" xlink:label="loc_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:to="lab_bokf_ChangeInFairValueDueToLoanRunoff_87E6B2C5831C81E24837C281C8C8A147" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_7C0A14F81DDE81E8BAD0C281C8C9E8D7_terseLabel_en-US" xlink:label="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_7C0A14F81DDE81E8BAD0C281C8C9E8D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value due to market assumption changes</link:label>
    <link:label id="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_7C0A14F81DDE81E8BAD0C281C8C9E8D7_label_en-US" xlink:label="lab_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_7C0A14F81DDE81E8BAD0C281C8C9E8D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions" xlink:label="loc_us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions_7C0A14F81DDE81E8BAD0C281C8C9E8D7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_F1ABB1C1CA6D6F34782EC281C8C905DA_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_F1ABB1C1CA6D6F34782EC281C8C905DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]</link:label>
    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_F1ABB1C1CA6D6F34782EC281C8C905DA_label_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAbstract_F1ABB1C1CA6D6F34782EC281C8C905DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_3903C464C638D335BBF3C281C8C98599_terseLabel_en-US" xlink:label="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_3903C464C638D335BBF3C281C8C98599" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discount rate - risk-free rate plus a market premium (in hundredths)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_3903C464C638D335BBF3C281C8C98599" xlink:to="lab_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_3903C464C638D335BBF3C281C8C98599" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment rate - based upon loan interest rate, original term and loan type, minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMinimum_EE9C7199B1682259CD5CC281C8C9FFDB" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepayment rate - based upon loan interest rate, original term and loan type, maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed Maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeedMaximum_F23BADE2A822B8A377D9C281C8CAB22E" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA_verboseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The minimum cost to service a performing loan for the period used as a variable in estimating fair value.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMinimum_04F4E49D437EC1783326C281C8CAD5DA" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879_verboseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used To Estimate Fair Value Performing Loan Service Cost Maximum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The maximum cost to service a performing loan for the period used as a variable in estimating fair value.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValuePerformingLoanServiceCostMaximum_15F8146BB47052F7A580C281C8CA4879" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanServiceCostMinimum_D8725CE7A88DD4EBAB7FC281C8CB4AFE" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Svc Cost Maximum</link:label>
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    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F" xlink:to="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueDelinquentLoanSvcCostMaximum_2082FAFDAD20008B34F3C281C8CB167F" xlink:type="arc" />
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451_terseLabel_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451_label_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Minimum</link:label>
    <link:label id="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451_documentation_en-US" xlink:label="lab_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Minimum</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum" xlink:label="loc_bokf_ServicingAssetsAtFairValueAssumptionsUsedToEstimateFairValueForeclosureLoanServiceCostMinimum_BCAFB22112C27577D971C281C8CB7451" xlink:type="locator" />
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    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_A8C3A52BC3283C8B09E70452D7E943AD_documentation_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_457C24B93CAB592E8BB749AF52DBEFE9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable" xlink:label="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_457C24B93CAB592E8BB749AF52DBEFE9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_457C24B93CAB592E8BB749AF52DBEFE9" xlink:to="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleTable_457C24B93CAB592E8BB749AF52DBEFE9" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_04B5045F5F8AC2F405260452D7E9A59F_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_2234E0E908D5557CAC09F7397631C64C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loan Commitments [Member]</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_04B5045F5F8AC2F405260452D7E9A59F_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_2234E0E908D5557CAC09F7397631C64C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Mortgage Loan Commitments [Member]</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoanCommitmentsMember_04B5045F5F8AC2F405260452D7E9A59F_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoanCommitmentsMember_2234E0E908D5557CAC09F7397631C64C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent contracts related to mortgage loan commitments to purchase.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialMortgageLoanCommitmentsMember" xlink:label="loc_bokf_ResidentialMortgageLoanCommitmentsMember_2234E0E908D5557CAC09F7397631C64C" xlink:type="locator" />
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    <link:label id="lab_bokf_ForwardSalesContractsMember_CFD64DF77BAF3EEAC9850452D7E96F30_terseLabel_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_59E09517698B57658C4A9D481FF229A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward sales contracts [Member]</link:label>
    <link:label id="lab_bokf_ForwardSalesContractsMember_CFD64DF77BAF3EEAC9850452D7E96F30_label_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_59E09517698B57658C4A9D481FF229A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward sales contracts [Member]</link:label>
    <link:label id="lab_bokf_ForwardSalesContractsMember_CFD64DF77BAF3EEAC9850452D7E96F30_documentation_en-US" xlink:label="lab_bokf_ForwardSalesContractsMember_59E09517698B57658C4A9D481FF229A5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents forward contracts to purchase mortgage loans.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ForwardSalesContractsMember" xlink:label="loc_bokf_ForwardSalesContractsMember_59E09517698B57658C4A9D481FF229A5" xlink:type="locator" />
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    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_18B0086F72C7609879C80452D7F9F47A_terseLabel_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_B8F740792C4E5577ADC00FAEC9D10CDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Line Items]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_18B0086F72C7609879C80452D7F9F47A_label_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_B8F740792C4E5577ADC00FAEC9D10CDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Residential Mortgage Loans Held For Sale [Line Items]</link:label>
    <link:label id="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_18B0086F72C7609879C80452D7F9F47A_documentation_en-US" xlink:label="lab_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_B8F740792C4E5577ADC00FAEC9D10CDC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems" xlink:label="loc_bokf_ScheduleOfResidentialMortgageLoansHeldForSaleLineItems_B8F740792C4E5577ADC00FAEC9D10CDC" xlink:type="locator" />
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    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_934443E935BA7A967AA30452D7F99E7F_terseLabel_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days outstanding for residential mortgage commitments, minimum (in days)</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_934443E935BA7A967AA30452D7F99E7F_label_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Number of Days Outstanding For Residential Mortgage Commitments</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_934443E935BA7A967AA30452D7F99E7F_documentation_en-US" xlink:label="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical minimum period for commitment to originate a residential mortgage loan to when the closed loan is sold to an investor.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments" xlink:label="loc_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:to="lab_bokf_MinimumNumberofDaysOutstandingForResidentialMortgageCommitments_C9B1BB2E2AFB5818B5905AA4881F03DD" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_0154F29E6BEB24D9EC140452D7F994B8_terseLabel_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days outstanding for residential mortgage commitments, maximum (in days)</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_0154F29E6BEB24D9EC140452D7F994B8_label_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Number of Days Outstanding For Residential Mortgage Commitments</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_0154F29E6BEB24D9EC140452D7F994B8_documentation_en-US" xlink:label="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical maximum period for commitment to originate a residential mortgage loan to when the closed loan is sold to an investor.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments" xlink:label="loc_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:to="lab_bokf_MaximumNumberofDaysOutstandingForResidentialMortgageCommitments_5AFEDA5A4F1F5721940E2367312C6890" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_11BCF0768B919DBEC1550452D7F982DF_terseLabel_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days for delivery of loans, for which the price is set by forward sales contracts, minimum (in days)</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_11BCF0768B919DBEC1550452D7F982DF_label_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Number of Days for Delivery of Forward Sales Contracts</link:label>
    <link:label id="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_11BCF0768B919DBEC1550452D7F982DF_documentation_en-US" xlink:label="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum number of days from the point of pricing being set to delivery of forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts" xlink:label="loc_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:to="lab_bokf_MinimumNumberofDaysforDeliveryofForwardSalesContracts_9D832A18F8D0592EBE9FBA97FF0E6CB9" xlink:type="arc" />
    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_67CDEF8824151F1E96E70452D7F9B796_terseLabel_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">General number of days for delivery for loans, for which the price is set by forward sales contracts, maximum (in days)</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_67CDEF8824151F1E96E70452D7F9B796_label_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Number of Days for Delivery of Forward Sales Contracts</link:label>
    <link:label id="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_67CDEF8824151F1E96E70452D7F9B796_documentation_en-US" xlink:label="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents represents the typical maximum number of days from the point pricing is set to delivery of forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts" xlink:label="loc_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:to="lab_bokf_MaximumNumberofDaysforDeliveryofForwardSalesContracts_E130544FB7CB5E39B812A74CAD24A844" xlink:type="arc" />
    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9D88971228EC98A9E6E80452D7F96F65_verboseLabel_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of days for past due for loan to be considered nonperforming (in days)</link:label>
    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9D88971228EC98A9E6E80452D7F96F65_label_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Days For Past Due Residential Mortgage Loans Held for Sale</link:label>
    <link:label id="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9D88971228EC98A9E6E80452D7F96F65_documentation_en-US" xlink:label="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of days past due for residential mortgage loans held for sale to be reported as delinquent.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale" xlink:label="loc_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:to="lab_bokf_NumberOfDaysForPastDueResidentialMortgageLoansHeldforSale_9F696AE151AD5D1380E533267BE5BFB6" xlink:type="arc" />
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_33EB64FF0B868889B1F60452D7F9410D_terseLabel_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_885EEFC2A690506CAB4FAC3E8D8C3698" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, nonperforming</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_33EB64FF0B868889B1F60452D7F9410D_label_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_885EEFC2A690506CAB4FAC3E8D8C3698" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, nonperforming</link:label>
    <link:label id="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_33EB64FF0B868889B1F60452D7F9410D_documentation_en-US" xlink:label="lab_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_885EEFC2A690506CAB4FAC3E8D8C3698" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential mortgage loans held for sale, 90 days past due or impaired.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ResidentialMortgageLoansHeldForSaleNonperforming" xlink:label="loc_bokf_ResidentialMortgageLoansHeldForSaleNonperforming_885EEFC2A690506CAB4FAC3E8D8C3698" xlink:type="locator" />
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    <link:label id="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_0CACE32095365F537EDD0452D7F91774_terseLabel_en-US" xlink:label="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Credit losses recognized on residential mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_0CACE32095365F537EDD0452D7F91774_label_en-US" xlink:label="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Credit losses recognized on residential mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_0CACE32095365F537EDD0452D7F91774_documentation_en-US" xlink:label="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Credit losses recognized on residential mortgage loans held for sale</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale" xlink:label="loc_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:to="lab_bokf_CreditLossesRecognizedOnResidentialMortgageLoansHeldForSale_7662383A5F535C2A942B528D51570F38" xlink:type="arc" />
    <link:label id="lab_bokf_ComponentsofResidentialMortgageLoansHeldforSaleAbstract_B5AC8EBEA381D67EBC1D0452D7F9EEA2_terseLabel_en-US" xlink:label="lab_bokf_ComponentsofResidentialMortgageLoansHeldforSaleAbstract_3DDDCF33E8005A11A23C76EEE8FAFE17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Residential Mortgage Loans Held for Sale [Abstract]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_16506765DC695BBA84157BEE927C5532" xlink:to="lab_bokf_LoansNumberOfDaysPastDueForNonRiskGradedLoanToBePlacedOnNonaccruingStatus_16506765DC695BBA84157BEE927C5532" xlink:type="arc" />
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_04DC6970614CDDA6FFE51F88D29E0EF0_terseLabel_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_04DC6970614CDDA6FFE51F88D29E0EF0_label_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Placed on Nonaccruing Status</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_04DC6970614CDDA6FFE51F88D29E0EF0_documentation_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of days following notification of a borrowers Chapter 7 bankruptcy that a non-risk graded loan is placed on nonaccruing status.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus" xlink:label="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:to="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsPlacedOnNonaccruingStatus_747444653607545492AA591F3209F0D0" xlink:type="arc" />
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_752FECABE94E3888CFE31F88D29E8D62_terseLabel_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans and Allowances for Credit Losses, Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_752FECABE94E3888CFE31F88D29E8D62_label_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_752FECABE94E3888CFE31F88D29E8D62_documentation_en-US" xlink:label="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Minimum number of days after which past due non-risk graded loans are charged off</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff" xlink:label="loc_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:to="lab_bokf_MinimumNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_50F40C7F0B3D5293AF2E4ABE905C5045" xlink:type="arc" />
    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_296F77DC4393149B3C661F88D29EA960_terseLabel_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans and Allowances for Credit Losses, Maximum No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_296F77DC4393149B3C661F88D29EA960_label_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Max No of Days After Which Past Due Non-Risk Graded Loans Are Charged Off</link:label>
    <link:label id="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_296F77DC4393149B3C661F88D29EA960_documentation_en-US" xlink:label="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum number of days after which past due non-risk graded loans are charged off</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff" xlink:label="loc_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:to="lab_bokf_MaxNoOfDaysAfterWhichPastDueNonRiskGradedLoansAreChargedOff_0E4B5AB784AA5AE196658C1771CEE1BB" xlink:type="arc" />
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_77F54EBF267C363FF7591F88D29EF882_terseLabel_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_77F54EBF267C363FF7591F88D29EF882_label_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans, Number of Days After Notification of Chapter 7 Bankruptcy Non-Risk Graded Loan is Charged Off</link:label>
    <link:label id="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_77F54EBF267C363FF7591F88D29EF882_documentation_en-US" xlink:label="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of days after notification of Chapter 7 bankruptcy for a non-risk graded loan to be charged off</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff" xlink:label="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:to="lab_bokf_LoansNumberOfDaysAfterNotificationOfChapter7BankruptcyNonRiskGradedLoanIsChargedOff_9866B39E948C5A099D56196B6035EC8E" xlink:type="arc" />
    <link:label id="lab_bokf_MortgageBankingRevenueAbstract_613F8C37BEFD570971FA2AAB9A449450_label_en-US" xlink:label="lab_bokf_MortgageBankingRevenueAbstract_A99000DEC1EC50D4A2551151F1950530" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Banking Revenue [Abstract]</link:label>
    <link:label id="lab_bokf_MortgageBankingRevenueAbstract_613F8C37BEFD570971FA2AAB9A449450_documentation_en-US" xlink:label="lab_bokf_MortgageBankingRevenueAbstract_A99000DEC1EC50D4A2551151F1950530" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mortgage Banking Revenue [Abstract]</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MortgageBankingRevenueAbstract" xlink:label="loc_bokf_MortgageBankingRevenueAbstract_A99000DEC1EC50D4A2551151F1950530" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MortgageBankingRevenueAbstract_A99000DEC1EC50D4A2551151F1950530" xlink:to="lab_bokf_MortgageBankingRevenueAbstract_A99000DEC1EC50D4A2551151F1950530" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_26044B5EE48ED6DA79C62AAB9A4470F3_terseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans_D523AA73A92254C5830583748D362D59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net realized gains on sale of mortgage loans</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfMortgageLoans_26044B5EE48ED6DA79C62AAB9A4470F3_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfMortgageLoans_D523AA73A92254C5830583748D362D59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Sale of Mortgage Loans</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfMortgageLoans" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_D523AA73A92254C5830583748D362D59" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfMortgageLoans_D523AA73A92254C5830583748D362D59" xlink:to="lab_us-gaap_GainLossOnSaleOfMortgageLoans_D523AA73A92254C5830583748D362D59" xlink:type="arc" />
    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_2BA40ABA01DAAAEFB9CE2AAB9A447065_terseLabel_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in unrealized gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_2BA40ABA01DAAAEFB9CE2AAB9A447065_label_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net change in unrealized gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_2BA40ABA01DAAAEFB9CE2AAB9A447065_documentation_en-US" xlink:label="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the net change in unrealized gain on mortgage loans held for sale under fair value option.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Netchangeinunrealizedgainonmortgageloansheldforsale" xlink:label="loc_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:to="lab_bokf_Netchangeinunrealizedgainonmortgageloansheldforsale_BA6422EF08E1576981C8993D47497FD7" xlink:type="arc" />
    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_B2C25D9FFED205F7CB012AAB9A44876D_terseLabel_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in the fair value of mortgage loan commitments</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_B2C25D9FFED205F7CB012AAB9A44876D_label_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage loan commitments</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageloancommitments_B2C25D9FFED205F7CB012AAB9A44876D_documentation_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in fair value of mortgage loan commitments during the period.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Changeinfairvalueofmortgageloancommitments" xlink:label="loc_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:to="lab_bokf_Changeinfairvalueofmortgageloancommitments_BB6A4BEA77F2533BB206F3182AF85BB9" xlink:type="arc" />
    <link:label id="lab_bokf_Changeinthefairvalueofforwardsalescommitments_6CE11675B33E247387A52AAB9A44BE54_terseLabel_en-US" xlink:label="lab_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in the fair value of forward sales contracts</link:label>
    <link:label id="lab_bokf_Changeinthefairvalueofforwardsalescommitments_6CE11675B33E247387A52AAB9A44BE54_label_en-US" xlink:label="lab_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in the fair value of forward sales commitments</link:label>
    <link:label id="lab_bokf_Changeinthefairvalueofforwardsalescommitments_6CE11675B33E247387A52AAB9A44BE54_documentation_en-US" xlink:label="lab_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the change in the fair value of forward sales commitments considered to be derivative instruments during the period.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Changeinthefairvalueofforwardsalescommitments" xlink:label="loc_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:to="lab_bokf_Changeinthefairvalueofforwardsalescommitments_AE4FCF9E804458E5808A5B38860DDDC8" xlink:type="arc" />
    <link:label id="lab_bokf_MortgageProductionRevenue_0FCEF1A1E4BA45E3C9E52AAB9A44450E_totalLabel_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total production revenue</link:label>
    <link:label id="lab_bokf_MortgageProductionRevenue_0FCEF1A1E4BA45E3C9E52AAB9A44450E_label_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Production Revenue</link:label>
    <link:label id="lab_bokf_MortgageProductionRevenue_0FCEF1A1E4BA45E3C9E52AAB9A44450E_documentation_en-US" xlink:label="lab_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Total gain (loss) on mortgage loans held for sale, including mortgage loan commitments and forward sales contracts.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MortgageProductionRevenue" xlink:label="loc_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:to="lab_bokf_MortgageProductionRevenue_05A4555A356B59228D475C556F4D0120" xlink:type="arc" />
    <link:label id="lab_bokf_MortgageServicingFees_7E8EC2C512846838FDBF2AAB9A44845D_terseLabel_en-US" xlink:label="lab_bokf_MortgageServicingFees_C792E9084D8D5233B4597FC4AE890DE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Servicing revenue</link:label>
    <link:label id="lab_bokf_MortgageServicingFees_7E8EC2C512846838FDBF2AAB9A44845D_label_en-US" xlink:label="lab_bokf_MortgageServicingFees_C792E9084D8D5233B4597FC4AE890DE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgage Servicing Fees</link:label>
    <link:label id="lab_bokf_MortgageServicingFees_7E8EC2C512846838FDBF2AAB9A44845D_documentation_en-US" xlink:label="lab_bokf_MortgageServicingFees_C792E9084D8D5233B4597FC4AE890DE1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Servicing fees for loans secured by real property.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_MortgageServicingFees" xlink:label="loc_bokf_MortgageServicingFees_C792E9084D8D5233B4597FC4AE890DE1" xlink:type="locator" />
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    <link:label id="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5_terseLabel_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Specific Allowance [Member]</link:label>
    <link:label id="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5_label_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Specific Allowance [Member]</link:label>
    <link:label id="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5_documentation_en-US" xlink:label="lab_bokf_SpecificAllowanceMember_BA38DC0769B7D5AB0378E1A3D34FB9B5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Financing receivables and related allowance that have been spefically allocated to a portfolio segment.</link:label>
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    <link:label id="lab_us-gaap_UnallocatedFinancingReceivablesMember_B5179A9608DDBF5A42A3E1A3D34F8903_terseLabel_en-US" xlink:label="lab_us-gaap_UnallocatedFinancingReceivablesMember_B5179A9608DDBF5A42A3E1A3D34F8903" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nonspecific Allowance [Member]</link:label>
    <link:label id="lab_us-gaap_UnallocatedFinancingReceivablesMember_B5179A9608DDBF5A42A3E1A3D34F8903_label_en-US" xlink:label="lab_us-gaap_UnallocatedFinancingReceivablesMember_B5179A9608DDBF5A42A3E1A3D34F8903" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unallocated Financing Receivables [Member]</link:label>
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    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_C8836D2E4A4F99980D94E1A3D3507D9A_terseLabel_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_C8836D2E4A4F99980D94E1A3D3507D9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Loss [Line Items]</link:label>
    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_C8836D2E4A4F99980D94E1A3D3507D9A_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_C8836D2E4A4F99980D94E1A3D3507D9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Loss [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_C8836D2E4A4F99980D94E1A3D3507D9A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_223E725FB36A54260C9EE1A3D3501F86" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_6F0E847A9BF421802831E1A3D352B1D8_label_en-US" xlink:label="lab_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_6F0E847A9BF421802831E1A3D352B1D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financing Receivable, Allowance for Credit Loss, Recovery</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_6F0E847A9BF421802831E1A3D352B1D8" xlink:type="locator" />
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    <link:label id="lab_bokf_Otherchangestoprovision_1B45A5CAB350EDDC885BE1A3D352F139_terseLabel_en-US" xlink:label="lab_bokf_Otherchangestoprovision_1B45A5CAB350EDDC885BE1A3D352F139" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other changes to provision</link:label>
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    <link:label id="lab_bokf_Otherchangestoprovision_1B45A5CAB350EDDC885BE1A3D352F139_documentation_en-US" xlink:label="lab_bokf_Otherchangestoprovision_1B45A5CAB350EDDC885BE1A3D352F139" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other changes to provision</link:label>
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    <link:label id="lab_bokf_Provisionchangeduetochangesinimpairment_2FD202F526A9074DCB89E1A3D353276E_terseLabel_en-US" xlink:label="lab_bokf_Provisionchangeduetochangesinimpairment_2FD202F526A9074DCB89E1A3D353276E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision change due to changes in impairment, risk grading, and other portfolio changes</link:label>
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    <link:label id="lab_bokf_Provisionchangesduetonetchargeoffs_7D3721E0345B1DD37F2BE1A3D353FD48_terseLabel_en-US" xlink:label="lab_bokf_Provisionchangesduetonetchargeoffs_7D3721E0345B1DD37F2BE1A3D353FD48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Provision changes due to net charge-offs</link:label>
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    <link:label id="lab_bokf_Provisionchangesduetonetchargeoffs_7D3721E0345B1DD37F2BE1A3D353FD48_documentation_en-US" xlink:label="lab_bokf_Provisionchangesduetonetchargeoffs_7D3721E0345B1DD37F2BE1A3D353FD48" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Provision changes due to net charge-offs</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Provisionchangesduetonetchargeoffs" xlink:label="loc_bokf_Provisionchangesduetonetchargeoffs_7D3721E0345B1DD37F2BE1A3D353FD48" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OffBalanceSheetCreditLossLiabilityRollforward_69A3EA9E47E316BB3B92E1A3D353B58D_terseLabel_en-US" xlink:label="lab_us-gaap_OffBalanceSheetCreditLossLiabilityRollforward_69A3EA9E47E316BB3B92E1A3D353B58D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Off-Balance Sheet, Credit Loss, Liability [Roll Forward]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A139107AEC51748F5824E54F7068B211" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A139107AEC51748F5824E54F7068B211" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A139107AEC51748F5824E54F7068B211" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash used in operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_DFE2B6BF29B27CEC879BE54F706A0C55" xlink:type="arc" />
    <link:label id="lab_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_46F75CA353DCFF931E58E54F706A738A_terseLabel_en-US" xlink:label="lab_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_46F75CA353DCFF931E58E54F706A738A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage servicing rights due to market changes</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MortgageServicingRightsMSRImpairmentRecovery" xlink:label="loc_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_46F75CA353DCFF931E58E54F706A738A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_46F75CA353DCFF931E58E54F706A738A" xlink:to="lab_us-gaap_MortgageServicingRightsMSRImpairmentRecovery_46F75CA353DCFF931E58E54F706A738A" xlink:type="arc" />
    <link:label id="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC_terseLabel_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in the fair value of mortgage servicing rights due to principal payments</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC_label_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in fair value of mortgage servicing rights due to loan runoff</link:label>
    <link:label id="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC_documentation_en-US" xlink:label="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the non-cash decrease in net pre-tax net income related to the change in fair value of mortgage servicing rights due to loan runoff</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff" xlink:label="loc_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:to="lab_bokf_Changeinfairvalueofmortgageservicingrightsduetoloanrunoff_E30FF1F8B1387F75FF37E54F706D1CEC" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3_negatedLabel_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net unrealized losses from derivative contracts</link:label>
    <link:label id="lab_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3_label_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrealized Gain (Loss) on Derivatives</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnrealizedGainLossOnDerivatives" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3" xlink:to="lab_us-gaap_UnrealizedGainLossOnDerivatives_31017FB8E597A2796010E54F706D6AE3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Payment Arrangement, Noncash Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28" xlink:to="lab_us-gaap_ShareBasedCompensation_BE5F27AAF47D5A8C3BDBE54F706D4B28" xlink:type="arc" />
    <link:label id="lab_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08_label_en-US" xlink:label="lab_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Amortization and Accretion, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationAmortizationAndAccretionNet" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08" xlink:to="lab_us-gaap_DepreciationAmortizationAndAccretionNet_FFFD6162A06FBDCC5F2FE54F706E6D08" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F_negatedLabel_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net amortization of discounts and premiums</link:label>
    <link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F_label_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accretion (Amortization) of Discounts and Premiums, Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F" xlink:to="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_572C499EA951412BB5B8E54F706E558F" xlink:type="arc" />
    <link:label id="lab_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10_negatedLabel_en-US" xlink:label="lab_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net losses (gains) on financial instruments and other losses (gains), net</link:label>
    <link:label id="lab_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10_label_en-US" xlink:label="lab_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Realized Investment Gains (Losses)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="loc_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10" xlink:to="lab_us-gaap_RealizedInvestmentGainsLosses_95615E24F23B2B27BD9FE54F706E5B10" xlink:type="arc" />
    <link:label id="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302_negatedLabel_en-US" xlink:label="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Net gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302_label_en-US" xlink:label="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net gain on mortgage loans held for sale</link:label>
    <link:label id="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302_documentation_en-US" xlink:label="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the combined realized net gain from sale of residential mortgage loans and the change in the unrealized net gain on mortgage loans held for sale during the period.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Netgainonmortgageloansheldforsale" xlink:label="loc_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:to="lab_bokf_Netgainonmortgageloansheldforsale_6606AE6968BB811FD26FE54F706EF302" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Mortgage loans originated for sale</link:label>
    <link:label id="lab_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9_label_en-US" xlink:label="lab_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Origination of Mortgage Loans Held-for-sale</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale" xlink:label="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9" xlink:to="lab_us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale_5C2B3A7F8F3021299EC3E54F706EEEB9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of mortgage loans held for sale</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Mortgage Loans Held-for-sale</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale" xlink:label="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643" xlink:to="lab_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_05D6C870FFDC7D9D115EE54F706EA643" xlink:type="arc" />
    <link:label id="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB_negatedTerseLabel_en-US" xlink:label="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Capitalized mortgage servicing rights</link:label>
    <link:label id="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB_label_en-US" xlink:label="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capitalized mortgage servicing rights</link:label>
    <link:label id="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB_documentation_en-US" xlink:label="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents non-cash adjustment to reconcile net income related to capitalization of mortgage servicing rights.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_Capitalizedmortgageservicingrights" xlink:label="loc_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:to="lab_bokf_Capitalizedmortgageservicingrights_A3615E663DAED7998BBFE54F706F6EDB" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInTradingSecurities_0453F4DB77640D320E08E54F706FA4EB_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInTradingSecurities_0453F4DB77640D320E08E54F706FA4EB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in trading and fair value option securities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_E00837403BBAD095E451E54F7071E537_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_E00837403BBAD095E451E54F7071E537" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfDebt_359EE65AB0B72B134D49E54F70725776_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfDebt_359EE65AB0B72B134D49E54F70725776" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in other borrowed funds</link:label>
    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfDebt_359EE65AB0B72B134D49E54F70725776_label_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfDebt_359EE65AB0B72B134D49E54F70725776" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Repayments of) Debt</link:label>
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    <link:label id="lab_bokf_NetChangeInDerivativeMarginAccounts_9F1925FB9D5B993E5586E54F7073E610_documentation_en-US" xlink:label="lab_bokf_NetChangeInDerivativeMarginAccounts_9F1925FB9D5B993E5586E54F7073E610" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The net change in derivative margin accounts.</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_89FA7560D2BF8BB7F123E54F7073E25C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_89FA7560D2BF8BB7F123E54F7073E25C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by financing activities</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4B919730FEEDE766C28DE54F73DD60BC_terseLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_4B919730FEEDE766C28DE54F73DD60BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net increase (decrease) in cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_4A28DD81DFE1F334E07DE54F7074D156_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_4A28DD81DFE1F334E07DE54F7074D156" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents at beginning of period</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_A97A036CEBD23F1F101BE54F7079A315_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_A97A036CEBD23F1F101BE54F7079A315" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_A97A036CEBD23F1F101BE54F7079A315_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_A97A036CEBD23F1F101BE54F7079A315" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activities</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_2D3DE8D54DB482C0B290E54F7079CED0_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_2D3DE8D54DB482C0B290E54F7079CED0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_2D3DE8D54DB482C0B290E54F7079CED0_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_2D3DE8D54DB482C0B290E54F7079CED0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
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    <link:label id="lab_us-gaap_TransferToOtherRealEstate_8BB8DC5BB825BB6A17DFE54F707A32A4_terseLabel_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_8BB8DC5BB825BB6A17DFE54F707A32A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loans and bank premises transferred to repossessed real estate and other assets</link:label>
    <link:label id="lab_us-gaap_TransferToOtherRealEstate_8BB8DC5BB825BB6A17DFE54F707A32A4_label_en-US" xlink:label="lab_us-gaap_TransferToOtherRealEstate_8BB8DC5BB825BB6A17DFE54F707A32A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Owned, Transfer to Real Estate Owned</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransferToOtherRealEstate" xlink:label="loc_us-gaap_TransferToOtherRealEstate_8BB8DC5BB825BB6A17DFE54F707A32A4" xlink:type="locator" />
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    <link:label id="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_5FEFD8DA7DDD732E0866E54F707A5B35_terseLabel_en-US" xlink:label="lab_bokf_IncreaseInUSGovernmentGuaranteedLoansEligibleForRepurchase_5FEFD8DA7DDD732E0866E54F707A5B35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period</link:label>
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    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51_terseLabel_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conveyance of other real estate owned guaranteed by U.S. government agencies</link:label>
    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51_label_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conveyance of other real estate owned guaranteed by US govt</link:label>
    <link:label id="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51_documentation_en-US" xlink:label="lab_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents non-cash conveyance of other real estate owned guaranteed by U.S. government agencies during period.</link:label>
    <link:loc xlink:href="bokf-20200331.xsd#bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt" xlink:label="loc_bokf_ConveyanceOfOtherRealEstateOwnedGuaranteedByUsGovt_0CAB38F856E2A8E986D5E54F707A2F51" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_D4A4880BADBA0CE04D5FE54F707A6ABE_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_D4A4880BADBA0CE04D5FE54F707A6ABE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets obtained in exchange for operating lease liabilities</link:label>
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    <link:label id="lab_us-gaap_HomeEquityLoanMember_1F939C3481FC471123F7E1C012C1FD7C_terseLabel_en-US" xlink:label="lab_us-gaap_HomeEquityLoanMember_1F939C3481FC471123F7E1C012C1FD7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Home Equity Loan [Member]</link:label>
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