| Abbreviation | Definition |
|---|---|
| SS | Souvenir Sheet |
| SSA | Side Saddle Association |
| SSBFC | Sonakshi Sinha Biggest Fan Club |
| SSDM | Short Stick Defensive Middie |
| SSDS | Secret Scurvy Dog Society |
| SSPHA | Silver Stirups Preferred Horse Association |
| SSPIA | Scottish Society of Paranormal Investigation and Analysis |
| STAND | Strong Till All Nine Disappear |
| STC | Saturn Tuners Club |
| stconikeconnect | St. Timothy's College Onike Connect |
| STL | Spelling That Limps |
| STLN | Sea Trail Lady Niners |
| STPI | Soul Trackers Paranormal Investigation |
| STTR | South Texas Trail Riders |
| STU | Street Touring Ultra |
| SVC | Shell Vacations Club |
| SVP | Surf and Verse Poetry Club |
| SVRA | Sportscar Vintage Racing Association |
| SW | Severe Weathering |
| SW | SWimmable |