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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-05-31</periodOfReport>

    <issuer>
        <issuerCik>0001398987</issuerCik>
        <issuerName>REALOGY HOLDINGS CORP.</issuerName>
        <issuerTradingSymbol>RLGY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001214552</rptOwnerCik>
            <rptOwnerName>SMITH SHERRY M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O REALOGY HOLDINGS CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>175 PARK AVENUE</rptOwnerStreet2>
            <rptOwnerCity>MADISON</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07940</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $0.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2017-05-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>29</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14637</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Consist of shares underlying dividend equivalent units (&quot;DEUs&quot;) on restricted stock units and deferred stock units. The DEUs accrued in connection with a quarterly cash dividend paid on May 31, 2017. The DEUs vest on the same terms as the underlying restricted stock units and, with respect to deferred stock units, are settleable on the same terms as the underlying deferred stock units.</footnote>
    </footnotes>

    <remarks>Exhibit 24.1 - Power of Attorney of Sherry M. Smith.*  *Previously filed.</remarks>

    <ownerSignature>
        <signatureName>/s/ Seth I. Truwit, as attorney-in-fact for Sherry M. Smith</signatureName>
        <signatureDate>2017-06-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
