| Abbreviation | Definition |
|---|---|
| URTC | Upper Ridgewood Tennis Club |
| URW | Urban Revolution Wrestling |
| US | Uncontested Shot |
| US | Unione Sportiva |
| USAA | United States Airhockey Association |
| USAA | United States Armwrestling Association |
| USAB | Utah Sports Authority Board |
| USABDA | United States Amateur Ballroom Dancers Association |
| USADSF | United States of America Deaf Sports Federation |
| USAG | United States of America Gymnastics |
| USANKF | USA National Karate Do Federation |
| USAR | U S A Rugby |
| USAR | United Speed Alliance Racing |
| USASA | United States Adult Soccer Association |
| USASA | United States of America Snowboard Association |
| USATF | Ultra Sports and Trail Foundation |
| USBA | United States Badminton Association |
| USBA | United States Balf Association |
| USBA | United States Baseball Association |
| USBA | United States Billiard Association |