| Abbreviation | Definition |
|---|---|
| COMEA | Council Of Music Education Associations |
| COMPTIA | Computing Technology Industry Association |
| CONA | Central Ohio Numismatic Association |
| CONCACAF | Confederation Of North Central American and Caribbean Association Football |
| COPA | Canadian Office Products Association |
| CORA | Charleston Ocean Racing Association |
| CORBA | Central Ohio River Business Association |
| CORBA | Chippewa Off Road Bike Association |
| CORBA | Concerned Off Road Bicyclists Association |
| COROA | Central Oregon Rental Owners Association |
| COSASA | Confederation Of Southern African Sports Association |
| COSGA | Conference On Student Government Associations |
| COSIA | Chamber of Small Industry Associations |
| COSIA | Cultivating Our Sisterhood International Association |
| COSMOS | ChuyênNguy?nHu?-Oriented Science and Mathematics Organization for Students |
| COSMOS | ChuyênNguyÅnHuÇ-Oriented Science and Mathematics Organization for Students |
| COSSA | Central Oregon Shooting Sports Association |
| COSSA | Consortium of Social Science Associations |
| COSTAM | Confederation of Scientific and Technological Associations in Malaysia |
| COTA | Canada Organic Trade Association |