| Abbreviation | Definition |
|---|---|
| BJ | Big Jump |
| BJ | Black Jack |
| BJA | British Judo Association |
| BJAA | Blue Jay Athletic Association |
| BJAA | Braun Jeffery Athletic Association, Pittsburgh, Pennsylvania |
| BJAA | Brea Junior Athletic Association |
| BJC | Bob Jones Combatives |
| BJC | British Judo Council |
| BJGP | Bulloch Junior Golf Program |
| BJJ | Basically Just Judo |
| BJJ | Brazilian Jiu Jitsu |
| BKA | British Keelboat Academy |
| BKK | British Karate Kyokushinkai |
| BKS | Beautiful Kenan Stadium |
| BKSC | Birmingham Kokni Sports Club |
| BL | Big Leap |
| BLC | Big League Connection |
| BLG | Beatles Lyrics Game |
| BLOR | Bloodsport League Of Rune |
| BLOW | Beautiful Ladies Of Wrestling |