| Abbreviation | Definition |
|---|---|
| USNT | United States National Team |
| USNT | USA Shooting National Team |
| USNTA | United States National Tennis Academy |
| USNZ | University Sport New Zealand |
| USOC | United States Olympic Committee |
| USOF | United States Orienteering Federation |
| USPA | United States Parachute Association |
| USPA | United States Polo Association |
| USPA | United States Poolplayers Association |
| USPC | United States Puzzle Championship |
| USPF | United States Powerlifting Federation |
| USPPA | United States PoolPlayers Association |
| USPPA | United States Powered Paragliding Association |
| USPTA | United States Professional Tennis Association |
| USPTO | United School Play Time Official |
| USQRA | United States Quad Rugby Association |
| USRA | United Slot Racers Association |
| USRA | United States Racquetball Association |
| USRA | United States Rimfire Association |
| USRA | Unlimited Scale Racing Association |