<SEC-DOCUMENT>0001593968-18-000118.txt : 20180108
<SEC-HEADER>0001593968-18-000118.hdr.sgml : 20180108
<ACCEPTANCE-DATETIME>20180108145745
ACCESSION NUMBER:		0001593968-18-000118
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180101
FILED AS OF DATE:		20180108
DATE AS OF CHANGE:		20180108

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Barton John D.
		CENTRAL INDEX KEY:			0001727423

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14384
		FILM NUMBER:		18516152

	MAIL ADDRESS:	
		STREET 1:		101 N. BROADWAY
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BANCFIRST CORP /OK/
		CENTRAL INDEX KEY:			0000760498
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				731221379
		STATE OF INCORPORATION:			OK
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		101 N BROADWAY STE 200
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102-8401
		BUSINESS PHONE:		4052701000

	MAIL ADDRESS:	
		STREET 1:		101 NORTH BROADWAY
		STREET 2:		STE 200
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102-8401

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	UNITED COMMUNITY CORP
		DATE OF NAME CHANGE:	19890401
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_01.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2018-01-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000760498</issuerCik>
        <issuerName>BANCFIRST CORP /OK/</issuerName>
        <issuerTradingSymbol>BANF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001727423</rptOwnerCik>
            <rptOwnerName>Barton John D.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 N. BROADWAY STE. 200</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OKLAHOMA CITY</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>73102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Regional Executive</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25090</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>ESOP</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ By: Kevin Foraker For: John D. Barton</signatureName>
        <signatureDate>2018-01-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
