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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001209191-10-004386.txt : 20100122
<SEC-HEADER>0001209191-10-004386.hdr.sgml : 20100122
<ACCEPTANCE-DATETIME>20100122103833
ACCESSION NUMBER:		0001209191-10-004386
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100120
FILED AS OF DATE:		20100122
DATE AS OF CHANGE:		20100122

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LOWERY LOUISE C
		CENTRAL INDEX KEY:			0001438555

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31940
		FILM NUMBER:		10540490

	MAIL ADDRESS:	
		STREET 1:		1090 HIGHLAND RD
		CITY:			SHARON
		STATE:			PA
		ZIP:			16146-3611

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FNB CORP/FL/
		CENTRAL INDEX KEY:			0000037808
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				251255406
		STATE OF INCORPORATION:			FL
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		F.N.B. CORPORATION
		STREET 2:		ONE F.N.B. BOULEVARD
		CITY:			HERMITAGE
		STATE:			PA
		ZIP:			16148
		BUSINESS PHONE:		724-981-6000

	MAIL ADDRESS:	
		STREET 1:		F.N.B. CORPORATION
		STREET 2:		ONE F.N.B. BOULEVARD
		CITY:			HERMITAGE
		STATE:			PA
		ZIP:			16148

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FNB CORP/PA
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CITIZENS BUDGET CO
		DATE OF NAME CHANGE:	19750909
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-01-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000037808</issuerCik>
        <issuerName>FNB CORP/FL/</issuerName>
        <issuerTradingSymbol>FNB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438555</rptOwnerCik>
            <rptOwnerName>LOWERY LOUISE C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1090 HIGHLAND ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SHARON</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>16146-3611</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-01-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8582</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>7.42</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>31988.3061</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Award of stock pursuant to the F.N.B. Corporation Restricted Stock and Incentive Bonus Plan.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Louise C. Lowery</signatureName>
        <signatureDate>2010-01-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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