| Abbreviation | Definition |
|---|---|
| CABL | Commonwealth Amateur Baseball League |
| CALB | Colorado American Legion Baseball |
| CBA | California Baseball Academy |
| CBC | Challengers Baseball Club |
| CBCA | California Baseball Coaches' Association |
| CBG | Certified Bucket Getters |
| CBSB | College Baseball Scouting Bureau |
| CBSI | Chatham Baseball and Softball Inc |
| CBT | Competitive Balance Tax |
| CBT | Cubs' Business Trade |
| CBUA | California Baseball Umpires Association |
| CBUA | Collegiate Baseball Umpires Association |
| CCBL | Cape Cod Baseball League |
| CCBL | Connecticut Collegiate Baseball League |
| CCTB | Central California Travel Baseball |
| CEB | Confederation of European Baseball |
| CG | Complete Games |
| CGB | Cottage Grove Baseball |
| CHAMPION | Courage, Honor, Attitude, Motivation, Persevere, Integrity, Optimistic, and Nessesary. |
| CHC | Chicago Cubs |