SF

• San Francisco, California, United States
• Sioux Falls, South Dakota, United States
• Sidi Fredj, Algeria
• South Florida, an urban region in the United States
• Suomi Finland, former vehicular country code for Finland

• Speculative fiction (usually sf)
• Science fiction or sci-fi (usually SF)

• Svensk Filmindustri, the Swedish film industry
• SF Film Finland, a Finnish film distributor
• SF Channel (Australia)
• Schweizer Fernsehen, a German-language television network in Switzerland
• Suomen Filmiteollisuus, a Finnish film production company

• Sforzando (musical direction) or sf, a musical accent
• Subito forte, a musical notation for dynamics (music)
• Switchfoot, a band
• Sasha Fierce, on-stage alter ego of American entertainer Beyoncé, and namesake of her album I Am... Sasha Fierce

• Saikoro Fiction, a Japanese role-playing game system
• Street Fighter, a series of fighting video games by Capcom

• Salzburg Forum, European security intergovernmental organization
• Samoa First, a political party in Samoa
• Sinn Féin, an Irish political party
• Socialistisk Folkeparti, a political party in Denmark
• Sosialistisk Folkeparti, a splinter group of the Norwegian Labour Party

• Statsforetak, a type of Norwegian state enterprise
• SF Express, a Chinese multinational delivery services and logistics company
• SF Airlines, a Chinese cargo airline owned by SF Express
• Salesforce, an American cloud computing company specializing in customer resource management
• SourceForge, a web-based service that offers a source code repository, download mirrors, bug tracking and other features
• Space forces, military service branches for space operations
• Special forces, military units trained to perform unconventional missions
• State Farm, an American insurance company
• Tassili Airlines (IATA designator SF)
• Six Flags
• A common shorthand for "Standard Form", a designation used by the United States Office of Personnel Management for forms used across various government agencies

==In science, math, and engineering==

• Significant figures, numeric digits contributing meaningfully to measurement resolution
• Safety factor, the capacity of a system beyond expected or actual loads
• Spontaneous fission, a form of radioactive decay found in very heavy elements
• Square foot, unit of area
• Stacking fault, a dislocation in a crystal
• S.F., an acronym name for stick figures

• A common abbreviation for the U.S. city of San Francisco, California's major professional sports teams:
• San Francisco 49ers, the city's National Football League team
• San Francisco Giants, the city's Major League Baseball team
• Small forward, a position in basketball
• Stade Français, a French rugby union team based in Paris
• Superleague Formula, a former motorsport racing series
• Super Formula Championship, a Japanese motorsport racing series
• Sacrifice fly, a play in baseball
• Semi-finals, a round in elimination tournaments
• Scuderia Ferrari, an Italian Formula One team

• San Francisco (sans-serif typeface), Apple's sans-serif and corporate typeface
• United States Air Force Security Forces, the ground combat, force protection and military police force of the U.S. Air Force
• United States Army Special Forces, special operations organization of the U.S. Army
• Selle Français, a French breed of horse
• A former hull classification symbol for a fleet submarine in the United States Navy
• Franklin Avenue Shuttle in New York City, sometimes signed as S^F in documents

• Garland SF-01 and Garland SF-03, fictional racing cars in Future GPX Cyber Formula
• {{look from}}

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