| Abbreviation | Definition |
|---|---|
| UHL | United Hockey League |
| UHL | Uplink Hacking League |
| UHS | Universal Hint System |
| UHT | Unihockey Team |
| UHU | Uni-Hockey Universitaetssportklub |
| UHW | Ultimate Hardcore Wrestling |
| UIC | Umpire In Chief |
| UIL | University Interscholastic League |
| UIW | Underground Independent Wrestling |
| UJAP | Union Jeanne d'Arc Phalange |
| UJBB | Ultimate Junior Bat Bag |
| UJZ | Utah Jazz basketball team |
| UKA | United Kingdom Aikikai |
| UKA | United Kingdom Athletics |
| UKA | United Kings Army |
| UKBSA | United Kingdom Board Sailing Association |
| UKC | Universal Karate Central |
| UKE | United Kingdom Extreme |
| UKF | Universal Kenpo Federation |
| UKG | U K Gamers |