| Abbreviation | Definition |
|---|---|
| BOMBA | Burlington Organized Minor Baseball Association |
| BOS | Boston Red Sox |
| BP | Ball Park |
| BP | Batting Practice |
| BPA | Baseball Players Association |
| BPT | Baseball Performance Training |
| BRB | Babe Ruth Baseball |
| BRO | Brooklyn Dodgers |
| BRS | Brantford Red Sox |
| BS | Blown Save |
| BSBL | Boys of Summer Baseball League |
| BT | Bats Throws |
| BTF | Baseball Think Factory |
| BTF | Baseball Tomorrow Fund |
| BWAA | Baseball Writers' Association of America |
| BYBS | Bolton Youth Baseball Softball |
| C | Catcher (baseball) |
| C | Cubs |
| CABA | Continental Amateur Baseball Association |
| CABL | Charlotte Adult Baseball League |