| Abbreviation | Definition |
|---|---|
| CODA | Combative Oriental And Defendu Arts |
| COE | Champions Of Empiriana |
| COGS | Complete Online Gaming System |
| COL | Colorado Rockies |
| COLTS | Count On Losing The Superbowl |
| COMEX | Commonwealth Expedition |
| COMFL | Central Ontario Minor Football League |
| COMS | City Of Manchester Stadium |
| COMSA | Colorado Masters Swimming Association |
| CONCACAF | Confederation Of North Central American And Caribbean Association Football |
| COP | Canada Olympic Park |
| COP | Close Of Play |
| COP | Conditions Of Participation |
| COPE | Challenging Outdoor Personnel Experience |
| CORA | California Outdoor Rollerskating Association |
| CORE | Capitol Off Road Enthusiasts |
| CORPS | Complete Omniversal Role Playing System |
| CORR | Championship Off Road Racing |
| CORS | Central Ontario Racing Series |
| CORT | Caribbean Ocean Racing Triangle |