| Abbreviation | Definition |
|---|---|
| CCCC | Cool Cardstock Cornucopia Collection |
| CCG | Collectible Card Game |
| CCGMS | Cobb County Gem and Mineral Society |
| CCM | Content And Collaboration Management |
| CCO | Contest Club Ontario |
| CCS | California Cheap Skates |
| CCS | Collective Consciousness Society |
| CDC | Camel Dive Club |
| CDG | Cave Diving Group |
| CDS | Circular Date Stamp |
| CDT | Cybertron Defense Team |
| CEBC | Clint Eastwood Bachelor Club |
| CEFX | Cabintech Experimenters Effects |
| CFA | Cat Fanciers' Association |
| CFCA | Cat Fanciers Clubs Association |
| CFCA | Central Florida Corvette Association |
| CFO | chicken fat operator [Morse code key speed] |
| CFSA | Cat Federation of Southern Africa |
| CFT | Comhairle Fo Thuinn (Irish Underwater Council) |
| CGCA | Colorado Gun Collectors Association |