| Abbreviation | Definition |
|---|---|
| STS | Sports Touring Sedan |
| STSP | South Tipperary Sports Partnership |
| STTB | Straight To The Bar |
| STWC | South Texas Walking Club |
| STXC | Cross Country Short Track |
| SUA | Shape Up America |
| SUB | Sports Utility Backpack |
| SUB | Sports Utility Bag |
| SUDS | Softball Under A Drunken State |
| SUG | Southern University Games |
| SUP | Sport Utility Pack |
| SUP | Sports Utility Pack |
| SUP | Stand Up Paddleboard |
| SUR | See Us Run |
| SUSA | Slovenian University Sports Association |
| SUSA | Southern Utah Soccer Association |
| SUSC | Saskatoon United Soccer Club |
| SUV | Sports Utility Vehicle |
| SUV | Sports Utility Vehicles |
| SV | Save |