| Abbreviation | Definition |
|---|---|
| CLT | Cross-Laminated Timber |
| CMCCC | Christ Memorial Child Care Center |
| CMFN | Canadian Model Forest Network |
| CNF | Cleveland National Forest |
| CNF | Coronado National Forest |
| CNFF | Cleveland National Forest Foundation |
| CNFM | Close to Nature Forest Management |
| CNNF | Chequamegon Nicolet National Forest |
| COF | The Catholic Order Of Foresters |
| COFD | Council On Forestry Development |
| COFE | Council on Forest Engineering |
| COFI | Council Of Forest Industries |
| CONFIR | Coalition Of Northern Forest Innovation and Research |
| CPF | Collaborative Partnership on Forests |
| CRFM | Citizens for Responsible Forest Management |
| CRSF | Center for Research on Sustainable Forests (est. 2006; University of Maine; Orono, ME) |
| CRSF | Coopers Rock State Forest (West Virginia) |
| CSFU | Central South Forestry University |
| CTFS | Center for Tropical Forest Science |
| CTFT | Centre Technique Forestier Tropical |