| Abbreviation | Definition |
|---|---|
| USTT | United States Table Tennis |
| USTU | United States Taekwondo Union |
| USTW | United States Taekwondo Won |
| USVA | United States Volleyball Association |
| USVFB | Upper School Varsity Football |
| USW | United Sayreville Wrestling |
| USW | United States Windsurfing |
| USYS | United States Youth Soccer |
| USYSA | United States Youth Soccer Association |
| UT | Under Tacking |
| UT | Unplayed Tie |
| UT | Unreal Tournament |
| UTA | United Taekwondo Association |
| UTA | Unreal Tournament Army |
| UTB | Ultimate Telemark Binding |
| UTC | Unreal Tournament Classes |
| UTF | United Tech Fans |
| UTF | Unreal Tournament Forum |
| UTFA | Upper Teign Fishing Association |
| UTFC | University of Texas at Austin Fencing Club |