| Abbreviation | Definition |
|---|---|
| COCA | Council of Ontario Construction Associations |
| COCG | Click Optimize Creative Group |
| CODA | Calgary Olympic Development Association |
| CODA | Central Oklahoma Directors Association |
| CODN | Caribbean Organisation Development Network |
| COE | Council on Occupational Education |
| COHBA | Central Oklahoma Home Builders Association |
| COLA | Cost Of Living Association |
| COLTO | Coalition of Legal Toothfish Operators |
| COMP | Canadian Organization of Medical Physicists |
| COMSOC | IEEE Communications Society |
| CONCACAF | Confederation Of North Central America And Caribbean Association Football |
| COP | Customer Oriented Process |
| COPA | Canadian Owners Pilots Association |
| COPA | Cirrus Owners And Pilots Association |
| COPE | Committee on Publication Ethics |
| COPOLCO | COnsumer POLicy COmmittee of the International Organization for Standardization |
| COPRA | Cosmetics Perfumery Retailers Association |
| CORE | Center for Operations Research and Econometrics |
| CORPS | Council of Organized Researchers for Pedagogical Studies of Ballet |