| Abbreviation | Definition |
|---|---|
| COSCOBC | Council of Senior Citizens' Organizations of British Columbia |
| COSEPAC | COmité sur la Situation des Espèces en Péril au Canada |
| COSEWIC | Committee On the Status of Endangered Wildlife In Canada |
| COSHA | Central Oregon Safety and Health Association |
| COSIA | Cultivating Our Sisterhood International Association, Inc. |
| COSO | Coalition On Sexual Orientation |
| COSTFORD | Center of Science and Technology for Rural Development |
| COTA | Central Oregon Trail Alliance |
| COTA | Children Of The Americas |
| COTA | Children's Organ Transplant Association |
| COTERC | Canadian Organization for Tropical Education and Rainforest Conservation |
| COTS | Chapter Officer Training School |
| COTS | Coalition On Temporary Shelter |
| COTS | Committee On The Shelterless |
| COTS-D | Coalition On Temporary Shelter - Detroit |
| COTY | Chapter Of The Year |
| COTY | Communicator Of The Year |
| COU | Creative Opportunities Unlimited |
| COW | Celebrating Our World |
| CP3 | Chris Paul Foundation |