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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001804039</cik>
        <entityName>Hg Saturn 2 B L.P.</entityName>
        <issuerAddress>
            <street1>1 ROYAL PLAZA, ROYAL AVENUE</street1>
            <city>ST. PETER PORT</city>
            <stateOrCountry>Y7</stateOrCountry>
            <stateOrCountryDescription>GUERNSEY</stateOrCountryDescription>
            <zipCode>GY1 2HL</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>44 1481 713843</issuerPhoneNumber>
        <jurisdictionOfInc>UNITED KINGDOM</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Partnership</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2019</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Hg Saturn 2 General Partner L.P. Inc.</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1 Royal Plaza</street1>
                <street2>Royal Avenue</street2>
                <city>St. Peter Port</city>
                <stateOrCountry>Y7</stateOrCountry>
                <stateOrCountryDescription>GUERNSEY</stateOrCountryDescription>
                <zipCode>GY1 2HL</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General partner of the Issuer (the &quot;General Partner&quot;)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>N/A</firstName>
                <lastName>Hg Saturn 2 General Partner (Guernsey) Limited</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1 Royal Plaza</street1>
                <street2>Royal Avenue</street2>
                <city>St. Peter Port</city>
                <stateOrCountry>Y7</stateOrCountry>
                <stateOrCountryDescription>GUERNSEY</stateOrCountryDescription>
                <zipCode>GY1 2HL</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>General partner of the General Partner (the &quot;GP Co&quot;)</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>James</firstName>
                <lastName>Nicolle</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1 Royal Plaza</street1>
                <street2>Royal Avenue</street2>
                <city>St. Peter Port</city>
                <stateOrCountry>Y7</stateOrCountry>
                <stateOrCountryDescription>GUERNSEY</stateOrCountryDescription>
                <zipCode>GY1 2HL</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the GP Co</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <lastName>Whittaker</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>1 Royal Plaza</street1>
                <street2>Royal Avenue</street2>
                <city>St. Peter Port</city>
                <stateOrCountry>Y7</stateOrCountry>
                <stateOrCountryDescription>GUERNSEY</stateOrCountryDescription>
                <zipCode>GY1 2HL</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Director of the GP Co</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Nicholas</firstName>
                <lastName>Humphries</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Hg Pooled Management Limited</street1>
                <street2>2 More London Riverside</street2>
                <city>London</city>
                <stateOrCountry>X0</stateOrCountry>
                <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                <zipCode>SE1 2AP</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive officer of the manager of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Matthew</firstName>
                <lastName>Brockman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Hg Pooled Management Limited</street1>
                <street2>2 More London Riverside</street2>
                <city>London</city>
                <stateOrCountry>X0</stateOrCountry>
                <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                <zipCode>SE1 2AP</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive officer of the manager of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Justin</firstName>
                <lastName>von Simson</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Hg Pooled Management Limited</street1>
                <street2>2 More London Riverside</street2>
                <city>London</city>
                <stateOrCountry>X0</stateOrCountry>
                <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                <zipCode>SE1 2AP</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive officer of the manager of the Issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Steven</firstName>
                <lastName>Batchelor</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Hg Pooled Management Limited</street1>
                <street2>2 More London Riverside</street2>
                <city>London</city>
                <stateOrCountry>X0</stateOrCountry>
                <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                <zipCode>SE1 2AP</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Executive officer of the manager of the Issuer</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Pooled Investment Fund</industryGroupType>
            <investmentFundInfo>
                <investmentFundType>Private Equity Fund</investmentFundType>
                <is40Act>false</is40Act>
            </investmentFundInfo>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
            <item>3C</item>
            <item>3C.7</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <yetToOccur>true</yetToOccur>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isPooledInvestmentFundType>true</isPooledInvestmentFundType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>Rede Partners LLP</recipientName>
                <recipientCRDNumber>None</recipientCRDNumber>
                <associatedBDName>Rede Partners (Americas) LLC</associatedBDName>
                <associatedBDCRDNumber>299631</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>110 Park Street</street1>
                    <street2>3rd Floor</street2>
                    <city>London</city>
                    <stateOrCountry>X0</stateOrCountry>
                    <stateOrCountryDescription>UNITED KINGDOM</stateOrCountryDescription>
                    <zipCode>W1K 6NX</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>RI</state>
                    <description>RHODE ISLAND</description>
                    <state>HI</state>
                    <description>HAWAII</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>GA</state>
                    <description>GEORGIA</description>
                    <state>TN</state>
                    <description>TENNESSEE</description>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>ME</state>
                    <description>MAINE</description>
                    <state>VA</state>
                    <description>VIRGINIA</description>
                    <state>MI</state>
                    <description>MICHIGAN</description>
                    <state>OH</state>
                    <description>OHIO</description>
                    <state>DE</state>
                    <description>DELAWARE</description>
                    <state>IA</state>
                    <description>IOWA</description>
                    <state>FL</state>
                    <description>FLORIDA</description>
                    <state>MD</state>
                    <description>MARYLAND</description>
                    <state>MA</state>
                    <description>MASSACHUSETTS</description>
                    <state>SC</state>
                    <description>SOUTH CAROLINA</description>
                    <state>UT</state>
                    <description>UTAH</description>
                    <state>IL</state>
                    <description>ILLINOIS</description>
                    <state>IN</state>
                    <description>INDIANA</description>
                    <state>CT</state>
                    <description>CONNECTICUT</description>
                    <state>WV</state>
                    <description>WEST VIRGINIA</description>
                    <state>DC</state>
                    <description>DISTRICT OF COLUMBIA</description>
                    <state>MN</state>
                    <description>MINNESOTA</description>
                    <state>WI</state>
                    <description>WISCONSIN</description>
                    <state>AZ</state>
                    <description>ARIZONA</description>
                    <state>KY</state>
                    <description>KENTUCKY</description>
                    <state>MO</state>
                    <description>MISSOURI</description>
                    <state>MT</state>
                    <description>MONTANA</description>
                    <state>OR</state>
                    <description>OREGON</description>
                    <state>LA</state>
                    <description>LOUISIANA</description>
                    <state>NH</state>
                    <description>NEW HAMPSHIRE</description>
                    <state>WA</state>
                    <description>WASHINGTON</description>
                    <state>NJ</state>
                    <description>NEW JERSEY</description>
                    <state>NM</state>
                    <description>NEW MEXICO</description>
                    <state>AK</state>
                    <description>ALASKA</description>
                    <state>AL</state>
                    <description>ALABAMA</description>
                    <state>TX</state>
                    <description>TEXAS</description>
                    <state>CO</state>
                    <description>COLORADO</description>
                    <state>NC</state>
                    <description>NORTH CAROLINA</description>
                    <state>PA</state>
                    <description>PENNSYLVANIA</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>4850000000</totalOfferingAmount>
            <totalAmountSold>0</totalAmountSold>
            <totalRemaining>4850000000</totalRemaining>
            <clarificationOfResponse>The Issuer is an entity in a master / feeder fund structure and the Total Offering Amount above reflects the total offering amount for the entire fund structure.</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>0</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse>Rede Partners LLP (the &quot;Agent&quot;) will receive a fee based on a percentage of the total subscriptions sold by the Agent on behalf of the Issuer.</clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>The General Partner will receive a management fee. The management fee will generally be equal to a percentage of aggregate subscriptions as specified in the Issuer's partnership agreement.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Hg Saturn 2 B L.P.</issuerName>
                <signatureName>/s/ James Nicolle</signatureName>
                <nameOfSigner>James Nicolle</nameOfSigner>
                <signatureTitle>Director of the GP Co</signatureTitle>
                <signatureDate>2020-02-26</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
