| Abbreviation | Definition |
|---|---|
| BFF | Back Flip Fails |
| BG | Body Geometry |
| BGAC | Bowling Green Athletic Club |
| BGSC | Boston Gymkhana Sports Club |
| BHAA | Business Houses Athletic Association |
| BHAAA | Beverly Hills Athletics Alumni Association |
| BHAC | Beacon Hill Athletic Club |
| BHAC | Beacon Hill Athletic Clubs |
| BHAC | Beverly Hills Athletic Club |
| BISAC | Bucharest International Schools Athletics Conference |
| BITM | Beast In The Making |
| BJAA | Blue Jay Athletic Association |
| BJAA | Braun Jeffery Athletic Association |
| BJAA | Braun Jeffery Athletic Association, Pittsburgh, Pennsylvania |
| BJAA | Brea Junior Athletic Association |
| BKAC | Blue Knight Athletic Club |
| BMAC | Bridgeton MO Athletic Complex |
| BMAF | British Masters Athletic Federation |
| BNAA | Bermuda National Athletics Association |
| BNAA | Building National Athletic Achievement |