<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001235468</cik>
        <entityName>LIQUIDITY SERVICES INC</entityName>
        <issuerAddress>
            <street1>6931 ARLINGTON ROAD</street1>
            <street2>SUITE 200</street2>
            <city>BETHESDA</city>
            <stateOrCountry>MD</stateOrCountry>
            <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
            <zipCode>20814</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>2024676868</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <middleName>P.</middleName>
                <lastName>Angrick, III</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jorge</firstName>
                <middleName>A.</middleName>
                <lastName>Celaya</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Mark</firstName>
                <middleName>A.</middleName>
                <lastName>Shaffer</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <middleName>M.</middleName>
                <lastName>Rallo</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Roger</firstName>
                <lastName>Gravley</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Phillip</firstName>
                <middleName>A.</middleName>
                <lastName>Clough</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>George</firstName>
                <middleName>H.</middleName>
                <lastName>Ellis</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Patrick</firstName>
                <middleName>W.</middleName>
                <lastName>Gross</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Beatriz</firstName>
                <middleName>V.</middleName>
                <lastName>Infante</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Edward</firstName>
                <middleName>J.</middleName>
                <lastName>Kolodzieski</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jaime</firstName>
                <lastName>Mateus-Tique</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>Liquidity Services, Inc.</street1>
                <street2>6931 Arlington Road, Suite 200</street2>
                <city>Bethesda</city>
                <stateOrCountry>MD</stateOrCountry>
                <stateOrCountryDescription>MARYLAND</stateOrCountryDescription>
                <zipCode>20814</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Over $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2018-07-10</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>true</isBusinessCombinationTransaction>
            <clarificationOfResponse>The issued securities constituted part of the consideration paid in connection with the acquisition of the stock of Machinio Corp. by Liquidity Services, Inc. (the Company), as disclosed in the Form 8-K filed by the Company with the SEC on July 10, 2018.</clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>4504842</totalOfferingAmount>
            <totalAmountSold>4504842</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse>The issued securities are valued at $6.75/share, the average of the closing prices of the common stock of the Company as reported by Yahoo! Finance for the 10 trading days immediately preceding July 10, 2018.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>2</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>LIQUIDITY SERVICES INC</issuerName>
                <signatureName>Mark A. Shaffer</signatureName>
                <nameOfSigner>Mark A. Shaffer</nameOfSigner>
                <signatureTitle>Vice President, General Counsel and Corporate Secretary</signatureTitle>
                <signatureDate>2018-07-13</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>