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  <xsd:element abstract="true" id="mrtn_The2015EquityIncentivePlanMember" name="The2015EquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_TirePurchasesMember" name="TirePurchasesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_TiresInServiceMember" name="TiresInServiceMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="mrtn_TiresInServicePolicyTextBlock" name="TiresInServicePolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_TractorMember" name="TractorMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_TrailerMember" name="TrailerMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_TruckloadMember" name="TruckloadMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_UnvestedPerformanceUnitAwardsMember" name="UnvestedPerformanceUnitAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_UnvestedServiceBasedOptionAwardsMember" name="UnvestedServiceBasedOptionAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_WalmartMember" name="WalmartMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_WorkersCompensationLiabilityClaimMember" name="WorkersCompensationLiabilityClaimMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-1-summary-of-significant-accounting-policies-estimated-useful-lives-details" name="statement-statement-note-1-summary-of-significant-accounting-policies-estimated-useful-lives-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-1-summary-of-significant-accounting-policies-tables" name="statement-statement-note-1-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-10-employee-benefits-nonvested-option-awards-activity-details" name="statement-statement-note-10-employee-benefits-nonvested-option-awards-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-10-employee-benefits-nonvested-performance-unit-award-activity-details" name="statement-statement-note-10-employee-benefits-nonvested-performance-unit-award-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-10-employee-benefits-option-activity-details" name="statement-statement-note-10-employee-benefits-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-10-employee-benefits-stock-options-valuation-assumptions-details" name="statement-statement-note-10-employee-benefits-stock-options-valuation-assumptions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-10-employee-benefits-tables" name="statement-statement-note-10-employee-benefits-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-14-revenue-and-business-segments-operating-revenue-and-operating-income-by-segment-details" name="statement-statement-note-14-revenue-and-business-segments-operating-revenue-and-operating-income-by-segment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-14-revenue-and-business-segments-tables" name="statement-statement-note-14-revenue-and-business-segments-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-accrued-liabilities-details" name="statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-accrued-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-prepaid-expenses-and-other-details" name="statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-prepaid-expenses-and-other-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-tables" name="statement-statement-note-2-details-of-consolidated-balance-sheet-accounts-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-5-income-taxes-components-of-provision-for-income-taxes-details" name="statement-statement-note-5-income-taxes-components-of-provision-for-income-taxes-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-5-income-taxes-federal-income-tax-reconciled-to-the-effective-income-tax-rate-details" name="statement-statement-note-5-income-taxes-federal-income-tax-reconciled-to-the-effective-income-tax-rate-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-5-income-taxes-net-deferred-tax-liability-details" name="statement-statement-note-5-income-taxes-net-deferred-tax-liability-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-5-income-taxes-tables" name="statement-statement-note-5-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-6-earnings-per-common-share-basic-and-diluted-earnings-per-common-share-details" name="statement-statement-note-6-earnings-per-common-share-basic-and-diluted-earnings-per-common-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-6-earnings-per-common-share-tables" name="statement-statement-note-6-earnings-per-common-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-9-leases-maturity-of-operating-lease-liabilities-details" name="statement-statement-note-9-leases-maturity-of-operating-lease-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-9-leases-operating-leases-balance-sheet-information-details" name="statement-statement-note-9-leases-operating-leases-balance-sheet-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-note-9-leases-tables" name="statement-statement-note-9-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mrtn_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
