| Abbreviation | Definition |
|---|---|
| SFF | Science Fiction Fantasy |
| SFFC | Sci Fi Fantasy Club |
| SFL | Science Fiction Looser |
| SFO | Star Fleet Operations |
| SFS | Science Fiction Society |
| SFS | Science Fiction Studies |
| SFS | Set For Stun (Phaser setting) |
| SFSF | Science Fiction/San Francisco |
| SFSFC | San Francisco Science Fiction Conventions, Inc |
| SFU | Star Fleet Universe |
| SG | Scary Ghost |
| SG | Spectral Guardians |
| SG | Supreme Guyver |
| SG1 | Stargate: SG1 |
| SGA | Star Gate Asgard |
| SGA | StarGate Atlantis |
| SGB | Star Golden Bell |
| SGC | Star Gate Command |
| SGG | Short Green Guy |
| SGI | Supernatural Ghost Investigation |