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    <link:label id="lab_us-gaap_Goodwill_30A049677F9FA33634FDCCB6133C1099_label_en-US" xlink:label="lab_us-gaap_Goodwill_30A049677F9FA33634FDCCB6133C1099" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentTable_DFC792A2789F396A5770CE0E89DFFA41_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_DFC792A2789F396A5770CE0E89DFFA41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
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    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_645D5AA475D4470FFA25CE0E89DFAAD7_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_645D5AA475D4470FFA25CE0E89DFAAD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_645D5AA475D4470FFA25CE0E89DFAAD7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_8CEAB818ADD611A67CD1CE0E89DFAC77" xlink:type="arc" />
    <link:label id="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129_terseLabel_en-US" xlink:label="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.67% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129_label_en-US" xlink:label="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3.67% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129_documentation_en-US" xlink:label="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">3.67% Senior Notes [Member]</link:label>
    <link:loc xlink:href="mtd-20180630.xsd#mtd_A367SeniorNotesMember" xlink:label="loc_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:to="lab_mtd_A367SeniorNotesMember_9F08892B0E587DABC2BECE0E89E08129" xlink:type="arc" />
    <link:label id="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A_terseLabel_en-US" xlink:label="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.10% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A_label_en-US" xlink:label="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.10% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A_documentation_en-US" xlink:label="lab_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.10% Senior Notes [Member]</link:label>
    <link:loc xlink:href="mtd-20180630.xsd#mtd_A4.10SeniorNotesMember" xlink:label="loc_mtd_A4.10SeniorNotesMember_79311C32B09C9841639FCE0E89E0997A" xlink:type="locator" />
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    <link:label id="lab_mtd_A3.84SeniorNotesMember_4AE648154A6EB67E71DACE0E89E53A59_label_en-US" xlink:label="lab_mtd_A3.84SeniorNotesMember_4AE648154A6EB67E71DACE0E89E53A59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">3.84% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A3.84SeniorNotesMember_4AE648154A6EB67E71DACE0E89E53A59_documentation_en-US" xlink:label="lab_mtd_A3.84SeniorNotesMember_4AE648154A6EB67E71DACE0E89E53A59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">3.84% Senior Notes [Member]</link:label>
    <link:loc xlink:href="mtd-20180630.xsd#mtd_A3.84SeniorNotesMember" xlink:label="loc_mtd_A3.84SeniorNotesMember_4AE648154A6EB67E71DACE0E89E53A59" xlink:type="locator" />
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    <link:label id="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07_terseLabel_en-US" xlink:label="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.24% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07_label_en-US" xlink:label="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.24% Senior Notes [Member]</link:label>
    <link:label id="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07_documentation_en-US" xlink:label="lab_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.24% Senior Notes [Member]</link:label>
    <link:loc xlink:href="mtd-20180630.xsd#mtd_A4.24SeniorNotesMember" xlink:label="loc_mtd_A4.24SeniorNotesMember_AF3F2944BFDCDB1F030ECE0E89E67E07" xlink:type="locator" />
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    <link:label id="lab_mtd_A1.47EUROSeniorNotesMember_70B60E08D87C8AA460FBCE0E89E671F4_documentation_en-US" xlink:label="lab_mtd_A1.47EUROSeniorNotesMember_70B60E08D87C8AA460FBCE0E89E671F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">1.47% EURO Senior Notes [Member]</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_D7D985973CF1F0D5DAB3CC8C8BF1AE32_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_D7D985973CF1F0D5DAB3CC8C8BF1AE32" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">EARNINGS PER COMMON SHARE</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_D7D985973CF1F0D5DAB3CC8C8BF1AE32_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_D7D985973CF1F0D5DAB3CC8C8BF1AE32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_0FC2572364E8ECE78E47CCB614E27CBF_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_0FC2572364E8ECE78E47CCB614E27CBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_0FC2572364E8ECE78E47CCB614E27CBF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_306BABDA3ACC3AF01B5DCCB614E2B552_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_306BABDA3ACC3AF01B5DCCB614E2B552" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_306BABDA3ACC3AF01B5DCCB614E2B552_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_306BABDA3ACC3AF01B5DCCB614E2B552" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5E9F484DFC19BA121DA9CCB614E2CF25_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5E9F484DFC19BA121DA9CCB614E2CF25" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net earnings to net cash provided by operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5E9F484DFC19BA121DA9CCB614E2CF25_label_en-US" xlink:label="lab_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5E9F484DFC19BA121DA9CCB614E2CF25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments, Noncash Items, 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/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5E9F484DFC19BA121DA9CCB614E2CF25" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Depreciation_82E2D94DDBD23453118BCCB614E29E1A_label_en-US" xlink:label="lab_us-gaap_Depreciation_82E2D94DDBD23453118BCCB614E29E1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_502F24E3798AEC7DB23ECCB614E2B4A7_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_502F24E3798AEC7DB23ECCB614E2B4A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred tax benefit</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_502F24E3798AEC7DB23ECCB614E2B4A7_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_502F24E3798AEC7DB23ECCB614E2B4A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensation_D8EC16708759A772EF6ACCB614E237F7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D8EC16708759A772EF6ACCB614E237F7" 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_D8EC16708759A772EF6ACCB614E237F7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D8EC16708759A772EF6ACCB614E237F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
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    <link:label id="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5E3085B41B1804401BD1CCB614E27C98_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5E3085B41B1804401BD1CCB614E27C98" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Gain on facility sale</link:label>
    <link:label id="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5E3085B41B1804401BD1CCB614E27C98_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_5E3085B41B1804401BD1CCB614E27C98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Property Plant Equipment</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_437EAB5C1D9D09301BBACCB614E295A7_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_437EAB5C1D9D09301BBACCB614E295A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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