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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-03-18 </periodOfReport> |
| <notSubjectToSection16> 0 </notSubjectToSection16> |
| <issuer> |
| | <issuerCik> 0000912752 </issuerCik> |
| | <issuerName> SINCLAIR BROADCAST GROUP INC </issuerName> |
| | <issuerTradingSymbol> SBGI </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001254010 </rptOwnerCik> |
| | | <rptOwnerName> MCCANNA LAWRENCE E </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> 6155 SHADYWOOD RD </rptOwnerStreet1> |
| | | <rptOwnerStreet2> UNIT 205 </rptOwnerStreet2> |
| | | <rptOwnerCity> ELKRIDGE </rptOwnerCity> |
| | | <rptOwnerState> MD </rptOwnerState> |
| | | <rptOwnerZipCode> 21075 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> 1 </isDirector> |
| | | <isOfficer> 0 </isOfficer> |
| | | <isTenPercentOwner> 0 </isTenPercentOwner> |
| | | <isOther> 0 </isOther> |
| | | <officerTitle></officerTitle> |
| | | <otherText></otherText> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Class A Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2020-03-18 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> P </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 5000 </value> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 11.0147 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> A </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 25150 </value> |
| <footnoteId id="F1"/> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <derivativeTable></derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> The Reporting Person also directly owns 500 shares of Class A Common Stock in an IRA. </footnote> |
| | </footnotes> |
| <remarks></remarks> |
| <ownerSignature> |
| | <signatureName> David R. Bochenek, on behalf of Lawrence E. McCanna, by Power of Attorney </signatureName> |
| | <signatureDate> 2020-03-20 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |