| Abbreviation | Definition |
|---|---|
| UBB | Ungdomarnas Båtbygge |
| UBC | Ultimate Bodyshaping Course |
| UBC | Union Boat Club |
| UBD | U. S. Bingo Daubers |
| UBG | Ultralight Backpacking Gear |
| UBH | United Basted Hunters |
| UBK | United Bowhunters of Kentucky |
| UBL | Urban Basketball League |
| UBO | Ultimate Baseball Online |
| UBP | United Base Players |
| UBP | United Bowhunters of Pennsylvania |
| UBPDHP | United Bowhunters of Pennsylvania Disabled Hunters Project |
| UBV | Uniao Brasileira de Veleiros |
| UBW | United Backyard Wrestling |
| UC | Unreal Championship |
| UCA | United Cheerleading Association |
| UCB | United Cricket Board |
| UCF | U Can't Finish |
| UCG | Union Cycliste Gessienne |
| UCI | Union Cycliste International |