SF
- DOH-5-hemiFLY
- Franklin Avenue Shuttle
- Future GPX Cyber Formula
- I Am... Sasha Fierce
- SF Airlines
- SF Channel (Australia)
- SF Express
- SF Film Finland
- Sacrifice fly
- Safety factor
- Saikoro Fiction
- Salesforce
- Salzburg Forum
- Samoa First Party
- San Francisco
- San Francisco (sans-serif typeface)
- San Francisco 49ers
- San Francisco Giants
- Schweizer Fernsehen
- Science fiction
- Scuderia Ferrari
- Selle Français
- Semi-finals
- Sforzando (musical direction)
- Sidi Fredj
- Significant figures
- Sinn Féin
- Sioux Falls, South Dakota
- Six Flags
- Small forward
- Socialistisk Folkeparti
- Sosialistisk Folkeparti
- SourceForge
- South Florida
- Space forces
- Special forces
- Speculative fiction
- Spontaneous fission
- Square foot
- Stacking fault
- Stade Français
- State Farm
- Statsforetak
- Street Fighter
- Suomen Filmiteollisuus
- Super Formula Championship
- Superleague Formula
- Svensk Filmindustri
- Switchfoot
- Tassili Airlines
- United States Air Force Security Forces
- United States Army Special Forces
- United States Office of Personnel Management