| Acronym | Definition |
|---|
| SF | Science Fiction |
| SF | Square Foot/Feet |
| SF | Source Forge (web site) |
| SF | San Francisco (California) |
| SF | Small Forward (basketball) |
| SF | Standard Form |
| SF | South Africa |
| SF | State Farm (insurance) |
| SF | Special Forces |
| SF | Santa Fe (railroad; Argentina province) |
| SF | Street Fighter (game) |
| SF | Single-Family Residential (zoning) |
| SF | Speculative Fiction |
| SF | Smoke(ing) Fetish |
| SF | Sugar Free |
| SF | Six Flags |
| SF | Sarasota Florida |
| SF | Strike Force |
| SF | Security Forces (USAF) |
| SF | State Fair |
| SF | SEEDS (Supporting Equanimity on Earth and Diversity in the Sacred) Foundation |
| SF | Structured Finance |
| SF | Scatter Factor |
| SF | Sinn Fein |
| SF | Soldier Front (gaming) |
| SF | Sunflower (agriculture) |
| SF | Sacrifice Fly (baseball) |
| SF | Seinfeld (TV show) |
| SF | Significant Figures |
| SF | Starfire (gaming, World of Warcraft) |
| SF | Selle Francais (France) |
| SF | Shadow Fiend (gaming) |
| SF | Sexually Frustrated |
| SF | Super Friendly |
| SF | Symptom Free (illnesses) |
| SF | Sigmund Freud |
| SF | Superfund (CERCLA) |
| SF | Stifel Financial (St. Louis, MO) |
| SF | Super Frame |
| SF | Swiss Franc |
| SF | Saturated Fat |
| SF | Scale Factor |
| SF | Socialistisk Folkeparti (Danish political party founded 1959) |
| SF | Senior Fellow |
| SF | Spontaneous Fission (radioactive decay) |
| SF | System Failure |
| SF | San Fierro (fictional gaming city, GTA: San Andreas) |
| SF | Server Full |
| SF | Switchfoot (band) |
| SF | Safety Factor |
| SF | Soldier Field (Chicago, Illinois) |
| SF | Skyfire (Everquest) |
| SF | Specialty Foods |
| SF | Special Form |
| SF | Step-Father |
| SF | Scarlet Fever |
| SF | Scuderia Ferrari (Formula 1 racing team) |
| SF | Soft Focus |
| SF | Surface Search Radar |
| SF | Semper Fidelis (US Marine motto; Latin: Always Faithful) |
| SF | Sticky Fingers (Rolling Stones album) |
| SF | Single Frequency |
| SF | Sand Filter |
| SF | Star Fox (video game) |
| SF | Synovial Fluid |
| SF | Status Field (SS7 MTP Layer 2) |
| SF | Server Farm |
| SF | Star Field |
| SF | Senses Fail (band) |
| SF | Spent Fuel |
| SF | Syphon Filter (video game) |
| SF | Sentinel's Fate (gaming; EverQuest) |
| SF | Star-Fleet |
| SF | Softball Field |
| SF | Svensk Film (Swedish Film) |
| SF | Secret Friends |
| SF | Spanish Fork |
| SF | Support Facility |
| SF | Scleroderma Foundation |
| SF | Screen Failure (clinical trials) |
| SF | Sinking Fund (financial) |
| SF | Structure Fire |
| SF | Scouting Force (US DoD) |
| SF | Stock Fund |
| SF | Sluggy Freelance (webcomic) |
| SF | Shining Force (game) |
| SF | Staple Food |
| SF | Slope Factor |
| SF | Static Firing (US NASA) |
| SF | Splicing Factor |
| SF | Something Fierce (band) |
| SF | Shooting Forward (basketball) |
| SF | Spreading Factor |
| SF | Snoqualmie Falls (Washington) |
| SF | Suomi Finland (Country) |
| SF | Supply Fan |
| SF | Soy Flour |
| SF | Saga Frontier (videogame) |
| SF | Shear Force |
| SF | Sign Flag |
| SF | South Fremont (Fremont, California) |
| SF | Shape Factor |
| SF | Security Function |
| SF | Sincerely and Fraternally |
| SF | Sourceforts (gaming) |
| SF | Service Feature |
| SF | Sustained Fire |
| SF | Star Fury (online game) |
| SF | Signal Frequency |
| SF | Special Facility |
| SF | Steel Fiber |
| SF | Supplemental Feeding |
| SF | Semifinished |
| SF | Spayed Female |
| SF | Stakeholder Forum |
| SF | Sparks Flew (band) |
| SF | Space Factor |
| SF | Space Filler (philately) |
| SF | Sheepsfoot |
| SF | Strataframe (Microsoft Visual Studio application framework) |
| SF | Sliding Filter |
| SF | Serum Ferritin Concentration |
| SF | Sherwood Foresters (Infantry Regiment of the British Army) |
| SF | SONICFLOOd (Christian band) |
| SF | Sick Freak |
| SF | Service & Finance |
| SF | Stowage Factor |
| SF | Soy Based Formula |
| SF | Streptomyces Fradiae |
| SF | Simple Formulation |
| SF | Stellar Frontier (game) |
| SF | Supreme Fascist (Paul Erdos) |
| SF | Scattering Function |
| SF | Steel - Face |
| SF | Sketchfu (drawing website) |
| SF | Sausage Festival (livejournal community) |
| SF | Slot Flag (computer networking) |
| SF | Sound & Flash |
| SF | Special Freighter (aircraft type) |
| SF | Substitute-Free (game theory) |
| SF | Sforzando/Sforzato (music) |
| SF | SightFirst |
| SF | Suomi Filmi (Finnish Film) |
| SF | Savings Factor |
| SF | Specialförbund (Sweden) |
| SF | Ship Fitter |
| SF | Synthetic Forces (US government simulation community) |
| SF | Survivor Function |
| SF | Shadow's Fall (band) |
| SF | Sanitary Fair (philately) |
| SF | Stable au Feu (French: Reaction to Fire) |
| SF | Source Factor |
| SF | Serendib Foundation for Music & Performing Arts (California) |
| SF | Supplementary Firing |
| SF | Secondary Feeder |
| SF | Spikelet Fertility |
| SF | Synchronization Flag |
| SF | Speed Freeks (band) |
| SF | Shivan Fighter (gaming) |
| SF | Sveriges Fotterapeuter (Stockholm, Sweden) |
| SF | Saikou-Fansubs (IRC network) |
| SF | Saikou-Fansubs (anime group) |
| SF | Splashwater Falls (amusement park ride) |
| SF | Speculative Fiction Canada (aka Science Fiction Canada) |
| SF | Sons of the Holy Family (religious order) |
| SF | Surya Foundation (Los Angeles, CA) |
| SF | Sandford Flemming building (University of Toronto) |
| SF | Sacramental Fusion (band) |
| SF | Siyath Foundation |
| SF | Sarana Foundation (Sri Lanka; est. 1991) |
| SF | Saman Foundation (Sri Lanka) |
| SF | Sahana Foundation (Sri Lanka) |