| Abbreviation | Definition |
|---|---|
| CVMS | Connecticut Valley Mycological Society |
| CVOS | Catawba Valley Orchid Society |
| CVRS | Cray Valley Radio Society |
| CVSS | Central Valley Safety Society |
| CVTS | Comox Valley Transition Society |
| CWAS | Central West Astronomical Society |
| CWAS | Central Wisconsin Aquarium Society |
| CWAS | Central Wisconsin Atheist Society |
| CWC | Conseil canadien du bois |
| CWOS | Centre for Work Organisation and Society |
| CWRS | Calgary Wildlife Rehabilitation Society |
| CWRS | Central Wisconsin Reef Society |
| CWRS | Civil War Reenactment Society |
| CWRS | Coastal Wildlife Refuge Society |
| CWRS | Crimean War Research Society |
| CWSA | Coventry and Warwickshire Society of Artists |
| CWTS | Civil War Token Society |
| CWWS | Chakhesang Women Welfare Society |
| CWWS | Clifton Women Welfare Society |
| CYSC | Carnatic Youth Society of Canada |