| Abbreviation | Definition |
|---|---|
| CORC | California Organics Recycling Council |
| CORC | Council of Regional Chairpersons |
| CORD | Council of Orthopaedic Residency Directors |
| CORE | Council On Research and Evaluation |
| COREN | Council Of Registered Engineers in Nigeria |
| CORGI | Council of Recognised Gas Installers |
| CORGI | The Council Of Recognised Gas Installers |
| CORM | Council for Optical Radiation Measurements |
| CORN | Council of Regional Networks |
| COS | Council Of Specialties |
| COSA | Council of School Attorneys |
| COSA | Council of State Archivists |
| COSATU | Council Of South African Trade Unions |
| COSC | Council of State Chambers |
| COSCO | Council of Senior Citizens Organizations |
| COSE | Council of Smaller Enterprises |
| COSE | Council of State Employees |
| COSH | Council for Occupational Safety and Health |
| COSH | Council on Smoking and Health |
| COSP | Council of State Presidents |