| Abbreviation | Definition |
|---|---|
| COI | Coefficient Of Inbreeding |
| CONVINCE | Consortium of North American Veterinary Interactive New Concept Education |
| COPA | Committee of Agricultural Organizations in the European Union |
| CORDIS | Community Research and Development Information Service (of the European Union) |
| CORGI | Council Of Registered Gas Installers |
| COSN | Common Snipe (bird) |
| COT | Cat Over Temp |
| COT | Committee On Toxicity of Chemicals in Food, Consumer Products, and the Environment |
| COVC | Country Oaks Veterinary Clinic |
| CP | Cloacal Protuberance |
| CPL | Cats Protection League |
| CPR | Cardio-Pulminary Resuscitation |
| CPR | Catch, Photograph, and Release |
| CPSM | Council for Professions Supplementary to Medicine |
| CPT | Carnivore Preservation Trust |
| CR | Carnivorous Raptor |
| CR | Catch And Remove |
| CR | Crown Record |
| CRFP | Council for the Registration of Forensic Practitioners |
| CRL | Crown to Rump Length |