| Abbreviation | Definition |
|---|---|
| BNF | Big Name Fan |
| BNTC | Bar Natation Triathlon Club |
| BNTC | Bob Niven Training Centre |
| BNU | Brooklyn Northern United AFC |
| BO | Baltimore Orioles |
| BO | Buick Open Golf Tournament |
| BOA | Barrels Of America |
| BOA | British Olympic Association |
| BOB | Bank One Ballpark |
| BOB | Body Opponent Bag |
| BOB | Breathing Observation Bubble |
| BOC | Bulgarian Olympic Committee |
| BOF | Building Of Fun |
| BOG | Ball Of the Game |
| BOG | Battle Of Giants |
| BOH | Rick Boh - Canadian ice hockey player |
| BOLT | Bikers Of Lesser Tolerance |
| BOMBA | Burlington Organized Minor Baseball Association |
| BOP | Back Of Pack |
| BOS | Boston Red Sox |