| Abbreviation | Definition |
|---|---|
| CRMC | Carolina Rebels Motorcycle Club |
| CRMC | Classic Racing Motorcycle Club |
| CROB | Club des Rendements Optimum de Bellechasse |
| CROC | Cobra Razor Owners Club |
| CROC | Columbia River Orienteering Club |
| CROCS | Cobra Replica Owners Club Sweden |
| CRPC | Charlotte Rifle And Pistol Club |
| CRRC | Cajun Road Runner's Club |
| CRRC | Camp Randall Rowing Club |
| CRSC | Californian Rabbit Specialty Club |
| CRSF | Club Regatas Santa Fe (Spanish: Racing Club Santa Fe; Argentina) |
| CRTN | Club Romand du Terre Neuve |
| CRYC | Campbell River Yacht Club |
| CRYC | Chagrin River Yacht Club |
| CRYC | Clarence River Yacht Club |
| CRYC | Clipper Race Yacht Club |
| CRYC | Columbia River Yacht Club |
| CRYC | Cooper River Yacht Club |
| CRYC | Coral Ridge Yacht Club |
| CS | Club Ship |