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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2015-10-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001626115</issuerCik>
        <issuerName>PJT Partners Inc.</issuerName>
        <issuerTradingSymbol>PJT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001039833</rptOwnerCik>
            <rptOwnerName>CUMINALE JAMES W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PJT PARTNERS INC., 280 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>General Counsel</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class B Common  Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Founder LTIP Units of PJT Partners Holdings LP</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>100000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>LTIP Units of PJT Partners Holdings LP</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>75000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents a series of LTIP Units (&quot;Founder LTIP Units&quot;) of PJT Partners Holdings LP (&quot;PJT Holdings&quot;).  These Founder LTIP Units generally vest as follows: (a) 20% vest on October 9, 2017, (b) 30% vest on October 9, 2018, and (c) 50% vest on October 9, 2019.  Upon the occurrence of specified events, these Founder LTIP Units can automatically be converted into Partnership Units of PJT Holdings on a one-for-one basis.</footnote>
        <footnote id="F2">Represents a series of LTIP Units (&quot;Earn-Out Units&quot;) of PJT Holdings.  Earn-Out Units are subject to both time and performance vesting. Earn Out Units generally satisfy the time-vesting requirement with 20% vesting on October 9, 2017, 30% vesting on October 9, 2018 and 50% vesting on October 9, 2019. The performance vesting requirement will be satisfied upon the publicly traded Class A shares of the Issuer achieving certain volume-weighted average share price (&quot;VWAP&quot;) targets over any consecutive 30-day trading period ending prior to October 1, 2021 as follows: (a) 20% will be earned upon achieving a VWAP trading price of $48 per share; (b) 20% will be earned upon achieving a VWAP trading price of $55 per share; (c) 20% will be earned upon achieving a VWAP trading price of $63 per share; (d) 20% will be earned upon achieving a VWAP trading price of $71 per share; and (e) 20% will be earned upon achieving a VWAP trading price of $79 per share.</footnote>
        <footnote id="F3">Upon the occurrence of specified events, the LTIP Units reported herein can automatically be converted into Partnership Units of PJT Holdings on a one-for-one basis.  Subject to the terms of an exchange agreement, on a quarterly basis, from and after October 1, 2016, the partnership units of PJT Holdings may be exchanged for cash or, at the election of the Issuer, shares of Class A common stock of the Issuer on a one-for-one basis.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James Cuminale</signatureName>
        <signatureDate>2015-10-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
