| Abbreviation | Definition |
|---|---|
| CO | Charity Organization |
| COA | Children Of Alcoholics |
| COA | Commissioned Officers Association (PHS) |
| COAD | Council On Addictive Diseases |
| COAF | Children Of Alcoholics Foundation |
| COAF | Children Of Armenia Fund |
| COAF | Clean Ohio Assistance Fund |
| COAF | College Of Arms Foundation |
| COASA | Children of Alcoholism and Substance Abuse |
| COAST | Citizens Of America Stand Together |
| COCA | Caring Of Child Administration |
| CODE | Canadian Organization for Development through Education (original name, now simply CODE) |
| CODN | Children Of Destiny Nicaragua |
| COF | Officers' Christian Fellowship of the USA |
| COG | Children's Oncology Group |
| COH | City Of Hope |
| COHAC | Cradle Of Hope Adoption Center |
| COHR | Committee On Human Relations |
| COK | Compassion Over Killing |
| COLCIA | Chinese Oral and Literary Copyright Intermediary Association |