| Abbreviation | Definition |
|---|---|
| UWD | Universal Wordgames Dictionary |
| UWF | Unlimited Wrestling Federation |
| UWH | UnderWater Hockey |
| UWHU | Ulster Women's Hockey Union |
| UWK | Ultras White Knights |
| UWL | Unified Wrestling League |
| UWN | Ultimate Wrestling Nation |
| UWP | United Weight Pullers |
| UWR | Underwater Rugby |
| UWR | Urban Wave Rider |
| UWSCC | University of Wales Swansea Canoe Club |
| UWX | Ultimate Wrestling eXperience |
| UWX | UnrealWarfare Xtreme |
| UXG | Ukrainian X-Games |
| UXL | Ultimate Xtra Large Baseball Bat Bag |
| UXS | United Xtreme Snipers |
| UXW | Universal Xtreme Wrestling |
| UYC | Unofficial Yacht Club |
| UYG | Urban Youth Golf |
| UYL | Ukrainian Youth League |