| Abbreviation | Definition |
|---|---|
| CSVA | Confederate States Vexillological Association |
| CSVG | Collectable Stereo Viewers Guide |
| CTCA | Coton de Tulear Club of America |
| CTFA | Children of Tomorrow Fanfiction Association |
| CTP | Card Type Possible |
| CTRL | Conspiracy Theory Research List |
| CTSC | Critical Thinkers Science Club |
| CUR | Current |
| CVA | Colonial Virginia Aeromodelers |
| CVBS | Central Valley Birding Symposium |
| CVCC | Cumberland Valley Corvette Club |
| CWBA | Central Wisconsin Bass Anglers |
| CWN | Coloring With Nelson |
| DAAS | Dad's Army Appreciation Society |
| DACW | Dave and Adam's Card World |
| DARG | Derbyshire Ancestral Research Group |
| DARS | Dallas Area Rocket Society |
| DB | Dragon Ball |
| DBDC | Dancing Baby Dance Club |
| DBDC | Daytona Beach Dream Cruise |