| Abbreviation | Definition |
|---|---|
| UAB | Unarmed Attack Bonus |
| UAE | U Are Eliminated |
| UAFA | Union of Arab Football Associations |
| UAFV | University of Alaska Fairbanks Volleyball |
| UAJ | University of Arizona Jumper |
| UAK | Unreal Arc Knight |
| UAL | U Are Last |
| UAPW | Urban American Pro Wrestling |
| UAR | Unio Atletica Rubi |
| UAR | Unión Argentina de Rugby |
| UASC | University Athletics and Sports Club |
| UASC | University of Auckland Snowsports club |
| UAT | United America senior Tour |
| UATA | Utah Athletic Trainers' Association |
| UAU | Underwater Adventure Unlimited |
| UB5 | Umpire Brush model 5 |
| UBA | Ulster Basketball Association |
| UBA | Ultimate Basketball Association |
| UBA | Universal Ballet Academy |
| UBB | Ultimate Bat Bag |