| Abbreviation | Definition |
|---|---|
| UEK | Urban Eskimo Kayaking |
| UEP | United English Patriots |
| UEU | Universal Exercise Unit |
| UEW | Ultimate E Wrestling |
| UEW | Urban Empire Wrestling |
| UFC | Ultimate Fighting Championship |
| UFC | United Football Club |
| UFD | Unreal Forum Deutschland |
| UFFDA | United Foundation For Disabled Archers |
| UFFL | United Furry Football League |
| UFL | Ultimate Fighting League |
| UFL | Ultimate Football League |
| UFN | Ultimate Fight Night |
| UFP | Ultimate Frisbee Player |
| UFQ | United Fighters of Quake |
| UFT | Ultimate Fly Tying |
| UFW | Ultra Fantasy Wrestling |
| UFWC | Unofficial Football World Championships |
| UFZ | Unified Force Zujitsu |
| UG | Ultimate Gamer |