| Abbreviation | Definition |
|---|---|
| UCWF | Unlimited Class Wrestling Federation |
| UEW | Ultimate E Wrestling |
| UEW | Urban Empire Wrestling |
| UFFB | Unbeatable Fighter of Fitness and Bodybuilding |
| UFW | Ultra Fantasy Wrestling |
| UGW | UnderGround Wrestling |
| UHW | Ultimate Hardcore Wrestling |
| UIW | Underground Independent Wrestling |
| UKW | United Kingdom Wrestling |
| UNW | Ulitmate Nonstop Wrestling |
| UPW | Pro Wrestling |
| UPW | Ultimate Pro Wrestling |
| URW | Urban Revolution Wrestling |
| USAA | United States Armwrestling Association |
| USCW | United States Championship Wrestling |
| USW | United Sayreville Wrestling |
| USWA | United States Wrestling Alliance |
| USWA | United States Wrestling Association |
| UTW | Ultimate Thunder Wrestling |
| UVC | Ultimate Victory Challenge |