| Abbreviation | Definition |
|---|---|
| CHV | Club Hippique de Versailles |
| CIA | Caucasians In Action |
| CIA | Club Information Agency |
| CIBC | Cockle Island Boat Club |
| CICC | Central Indiana Camaro Club |
| CICI | Cochlear Implant Club International |
| CICO | Club Internet Communications Officer |
| CIEB | Club Italiano Epagneul Breton |
| CIGAS | Club Italiano del Gatto Abissino e Somalo |
| CIGC | Cherry Island Golf Club |
| CIGC | Christmas Island Golf Club |
| CIHC | Columbus Ice Hockey Club |
| CIJC | Central Illinois Jeep Club |
| CILR | Club Informatique de La Rochette |
| CIPC | Comit Internacional De Pipa Clubs |
| CIPC | Comite International des Pipe Clubs |
| CIRN | Club Italiano Razze Nordiche |
| CISC | Caltech International Spouses Club |
| CISC | Cook Inlet Soccer Club |
| CIWC | Central Indiana Wilderness Club |