| Abbreviation | Definition |
|---|---|
| BCBL | Beardsley Championship Baseball League |
| BCH | BenCH |
| BEAT | Baseball Editorials Analysis and Talk |
| BEST | Baseball Enthusiasts for Strategic Table games |
| BF | Batters Faced |
| BFA | Baseball Federation of Asia |
| BFIB | Best Fans in Baseball |
| BFIB | Best Farts In Baseball |
| BFJ | Baseball Federation Of Japan |
| BIG | Baseball Is Great |
| BK | BalK |
| BL | Both Leagues |
| BLBA | Big Lake Baseball Association |
| BLBA | Big League Baseball Academy |
| BLBA | Buzz Lightning Baseball Academy |
| BLLB | Brownsburg Little League Baseball |
| BMBL | Birmingham Metro Baseball League |
| BMBL | Boston Men's Baseball League |
| BMP | Baseball Mentoring Program |
| BOB | Bank One Ballpark |