| Abbreviation | Definition |
|---|---|
| CLMF | Conservation Leadership and Management Fellowship |
| CLN | Conservation Lands Network |
| CLP | Conservation Leadership Programme |
| CLS | Conservation Landscape Services |
| CLSP | Conservation Land Stewardship Program |
| CLZ | Conservation Lower Zambezi |
| CMCN | China Mangrove Conservation Network |
| CMCZ | candidate Marine Conservation Zones |
| CMOU | Conservation Memorandum Of Understanding |
| CMP | Conservation Measures Partnership |
| CMSI | Conservation Management System International |
| CMTP | Conservation Management Training Program |
| CNCV | Crewe Nantwich Conservation Volunteers |
| CNHC | Crocodilians Natural History and Conservation |
| CNOW | Conservation Notices of the Week |
| COAL | Conservation of African Life |
| COAL | Conservation Of All Life |
| COAM | Conservation Organization for Afghan Mountains |
| COCN | Central Oregon Conservation Network |
| COFEPOSA | Conservation of Foreign Exchange and Prevention of Smuggling Activities |