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

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001385897</cik>
        <entityName>STEELHEAD NAVIGATOR MASTER, L.P.</entityName>
        <issuerAddress>
            <street1>C/O CITCO FUND SERVICES (BERMUDA) LTD</street1>
            <street2>4TH FL.; MINTFLOWER PL., 8 PAR-LA-VILLE</street2>
            <city>HAMILTON</city>
            <stateOrCountry>D0</stateOrCountry>
            <stateOrCountryDescription>BERMUDA</stateOrCountryDescription>
            <zipCode>HM08</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>441-295-7149</issuerPhoneNumber>
        <jurisdictionOfInc>CAYMAN ISLANDS</jurisdictionOfInc>
        <edgarPreviousNameList>
            <previousName>STEELHEAD OFFSHORE CAPITAL, L.P.</previousName>
            <previousName>STEELHEAD OFFSHORE CAPITAL LP</previousName>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Steelhead Navigator Cayman GP, Ltd.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Citco Fund Services (Bermuda) Ltd</street1>
                <street2>Mintflower Place, 4th Fl, 8 Par-La-Ville</street2>
                <city>Hamilton</city>
                <stateOrCountry>D0</stateOrCountry>
                <stateOrCountryDescription>BERMUDA</stateOrCountryDescription>
                <zipCode>HM 08</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General Partner of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Paul</firstName>
                <lastName>Stevenson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Mayflower Mgmt. Svcs. (Bermuda) Ltd.</street1>
                <street2>102 St. James Court Flatts</street2>
                <city>Smiths</city>
                <stateOrCountry>D0</stateOrCountry>
                <stateOrCountryDescription>BERMUDA</stateOrCountryDescription>
                <zipCode>FL 04</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the general partner of the issuer</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Hedge Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <aggregateNetAssetValueRange>Decline to Disclose</aggregateNetAssetValueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001385897-11-000002</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2004-11-01</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>1000000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>412564594</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>1</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>STEELHEAD NAVIGATOR MASTER, L.P.</issuerName>
                <signatureName>/s/Paul Stevenson</signatureName>
                <nameOfSigner>Paul Stevenson</nameOfSigner>
                <signatureTitle>Director of the GP of the Issuer</signatureTitle>
                <signatureDate>2011-06-20</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>