| Abbreviation | Definition |
|---|---|
| BASES | Baseball Academy for Sustaining Education in Sport |
| BASES | Baseball And Softball Essential Skills |
| BAT | Baseball Assistance Team |
| BATB | Bay Area Texas Baseball |
| BAWP | Baseball Association of Western Province |
| BAYB | Broken Arrow Youth Baseball |
| BB | Base on Balls |
| BB | BaseBall |
| BBB | Baseball Bat Bag |
| BBBA | Big Bad Baseball Annual |
| BBBB | BestGore Baseball Bats Beating |
| BBBL | Bambis Bombers Baseball League |
| BBBL | Big Bats Baseball League |
| BBBL | Bleacher Bums Baseball League |
| BBF | British Baseball Federation |
| BBL | Backyard Baseball League |
| BBSA | Bloomingdale Baseball and Softball Association |
| BBSA | Braidwood Baseball Softball Association |
| BBSA | Burlington Baseball and Softball Association |
| BCBL | Beach Collegiate Baseball League |