SF

SF is a two-letter abbreviation which may refer to:

• San Francisco, California, a city with a population of more than 750,000, located on the Pacific coast of the United States
• Sinn Féin, Irish political party with links with the IRA.
• Schweizer Fernsehen (Swiss Television)
• Science fiction, a literary genre
• Scuderia Ferrari, the racing division of the Ferrari automobile company
• Significant figures (in mathematics)
• SourceForge, a collaborative software development management system
• Special forces - small, highly trained and specialised military units
• Speculative fiction, a literary genre
• Sofia, the capital city of Bulgaria
• Street Fighter, a series of electronic fighting games by the company Capcom
• Syphon Filter, A series of action-shooter games on the Sony Playstation consoles.
• Danish Socialist People's Party (an abbreviation for the Danish name "Socialistisk Folkeparti")
• The Six Flags chain of theme parks
• Swedish Film Industry (Svensk Filmindustri)
• Switchfoot - an alt-rock band
• Scaterd Few - a Christian punk band
• Stellar frontier - A game by Stardock in 1997.
• Tassili Airlines, IATA airline designator
• Salad Fingers - A flash animation created by David Firth

Former (now defunct) uses of SF include:

• Finland as an abbreviation for "Suomi-Finland". ("Suomi" is the Finnish name for Finland.)
• Suomen Filmiteollisuus, a Finnish film production company, was abbreviated SF.
• the Hull classification symbol for a "Fleet Submarine" in the United States Navy