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  <xs:element id="opy_ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageStrikePrice" abstract="false" name="ShareBasedCompensationArrangementByCashPaymentAwardStockAppreciationRightsWeightedAverageStrikePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
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  <xs:element id="opy_ExpirationDateOneMember" abstract="true" name="ExpirationDateOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="opy_InvestmentBankingFeesMember" abstract="true" name="InvestmentBankingFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="opy_FinancialInstrumentsEstimateNotPracticableFairValueTextBlock" abstract="false" name="FinancialInstrumentsEstimateNotPracticableFairValueTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="opy_ContractswithCustomersAssetsandLiabilitiesTable" abstract="true" name="ContractswithCustomersAssetsandLiabilitiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="opy_FairValueEstimateNotPracticableReceivablesFromClearingOrganizations" abstract="false" name="FairValueEstimateNotPracticableReceivablesFromClearingOrganizations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_CapitalCommitments" abstract="false" name="CapitalCommitments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_DeferredTaxAssetsInvoluntaryConversion" abstract="false" name="DeferredTaxAssetsInvoluntaryConversion" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_DebtInstrumentIssuePricePercentage" abstract="false" name="DebtInstrumentIssuePricePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="opy_OperatingLeaseInterestExpense" abstract="false" name="OperatingLeaseInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_BankCallLoansDisclosureTextBlock" abstract="false" name="BankCallLoansDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="opy_VariableInterestEntityAssets" abstract="false" name="VariableInterestEntityAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_SecuritiesBorrowedTransactionsMember" abstract="true" name="SecuritiesBorrowedTransactionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="opy_FairValueEstimateNotPracticableBankCallLoans" abstract="false" name="FairValueEstimateNotPracticableBankCallLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="opy_JanuarySixTwoThousandSeventeenMember" abstract="true" name="JanuarySixTwoThousandSeventeenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>
