| Abbreviation | Definition |
|---|---|
| USRI | United Street Rods of Idaho |
| USRSA | United States Running Streak Association |
| USRT | Usually Sideways Rally Team |
| USS | United States Swimming |
| USSA | United Special Sportsmen Alliance |
| USSA | UNITED STATES SKI Association |
| USSA | United States Snowsport Association |
| USSAF | United States Sports Acrobatics Federation |
| USSAF | United States Sportsmens Alliance Foundation |
| USSAF | Us Sportsmen S Alliance Foundation |
| USSC | Utah Shooting Sports Council |
| USSF | United States Soccer Federation |
| USSR | Ultra Simple Skirmish Rules |
| USSSA | United States Specialty Sports Association |
| USSSA | Unites States Specialty Sports Association |
| USTA | United States Tennis Association |
| USTF | United States Taekwondo Federation |
| USTF | United States Taekwon-Do Federation |
| USTRC | United States Team Roping Championship |
| USTRC | United States Team Roping Championships |