| Abbreviation | Definition |
|---|---|
| SECF | Sheffield Emergency Care Forum |
| SFD | Sportowe Forum Dyskusyjne |
| SIEF | Substance Information Exchange Forum |
| SIF | Silicon Innovation Forum |
| SMF | Simple Machines Forum |
| SMF | Simple Machines Forums |
| SOFA | SWIFT Operational Forum Americas |
| SOT | Seriously Off Topic |
| SPBF | Specialty Pharmacy Business Forum |
| SPDF | Special Park Districts Forum |
| SPF | Site Point Forums |
| SPF | Sustainable Performance Forum |
| STCF | Setting The Captive Free |
| STREF | South Tyneside Region Equality Forum |
| SURF | Scottish Urban Regeneration Forum |
| SURF | Service User Reference Forum |
| SURF | Stanford US Russia Forum |
| SVF | Swiss Venture Forum |
| SWARF | Scottish Wider Access Regional Forum |
| SWEF | Space Weather Enterprise Forum |