| Abbreviation | Definition |
|---|---|
| CARA | Chicago Area Runners Association |
| CARB | Central Auto Racing Boosters |
| CARP | Central Arkansas Recreational Pedalers |
| CARSA | Centre for Athletics Recreation and Special Abilities |
| CART | Championship Auto Race Team |
| CART | Championship Auto Race Teams |
| CART | Championship Auto Racing Team |
| CART | Championship Auto Racing Teams |
| CASC | Community Amateur Sports Club |
| CASC | Community Amateur Sports Clubs |
| CASF | Colorado Adaptive Sports Foundation |
| CATA | Capital Area Tennis Association |
| CATS | Children's Athletic Training School |
| CATS | Cooperation Achieves Team Success |
| CAW | Create A Wrestler |
| CB | Chat Box |
| CBA | Chinese Basketball Association |
| CBA | Code Breaker Advance |
| CBA | Continental Basketball Association |
| CBAD | Central Basketball Association of the Deaf |