| Abbreviation | Definition |
|---|---|
| CADC | Classy And Dabby Club |
| CADP | Clube De Adictos A Deep Purple |
| CAEB | Clubs And Events Board |
| CAHC | Colorado Arabian Horse Club |
| CALA | Club Atlético Los Andes |
| CAOM | Club d'amateurs d'oiseaux de Montr??al |
| CAOM | Club d'amateurs d'oiseaux de Montréal |
| CAOS | Club of Amateurs in Optical Spectroscopy |
| CARC | Club Atlético Rosario Central |
| CARC | Coastside Amateur Radio Club |
| CARC | Coconino Amateur Radio Club |
| CARC | Columbia Amateur Radio Club |
| CARC | Columbus Amateur Radio Club |
| CARP | Club Atlético River Plate |
| CASA | Creative Arts Southern Alberta |
| CASC | Canadian Automobile Sport Clubs |
| CASC | Central Arkansas Swim Club |
| CASDI | Club Auto Sport Defi Inc |
| CASDI | Club Auto Sport Defi Incorporated |
| CASDI | Club Autos Sport D??fi Inc |