| Abbreviation | Definition |
|---|---|
| SFK | SugarFreeKitchen.com |
| SFL | Sign For Life |
| SFLC | Santa Fe Leasing Company |
| SFMAIC | State Farm Mutual Automobile Insurance Company |
| SFO | San Francisco Orthodontists |
| SFPC | Shannon Foynes Port Company |
| SFPPL | Sanjeev Flexi Pack Pvt Ltd |
| SFS | Sanyo Fisher Service |
| SFSFC | San Francisco Science Fiction Conventions, Inc |
| SFT | Solutions For Tomorrow |
| SFU | Salted Fish United |
| SFW | Salado Fine Woodworks |
| SFW | Seattle Film Works |
| SFX | San Francisco Exchange Company |
| SFY | Solutions for You, Inc. |
| SFY | Specially For You studio.com |
| SFZ | Science Fiction Zone |
| SFZ | Sudanese Free Zones & Markets Company |
| SG | Savage Garden |
| SG | Schneider Grunau |