| Abbreviation | Definition |
|---|---|
| COMET | Construction Organizing Membership Educational Training |
| COMPASS | COMPrehensive Addiction Service Systems |
| CONCERN | CONquer canCER Now |
| Cong. | Congregational |
| CONT | Center Of Next Transformation |
| COOL | Chapter Officers Optimizing Lead |
| COP | Christian Orthopaedic Partners |
| COPA | Chapter Outstanding Performance Award |
| COPE | Center for Occupational & Personalized Education |
| COPS | Concerns Of Police Survivors |
| CORC | California Organic Recycling Council |
| CORE | Center for Organ Recovery and Education |
| CORE | Consortium for Oceanographic Research and Education |
| CORF | California Ornamental Research Federation |
| CORHIO | Colorado Regional Health Information Organization |
| CORN | Community Owned Resource Network |
| CORPA | Council on Recognition of Postsecondary Accreditation |
| COS | Corporation Of Seniors |
| COSA | Coptic Orphans Support Association |
| COSCO | Council of Senior Citizens' Organizations |