| Abbreviation | Definition |
|---|---|
| CCSR | Center for Climate System Research |
| CCSR | Concord Consortium Sonar Ranger |
| CCWCP | Coordinating Committee for the World Climate Program |
| CDC | Climate Diagnostics Center |
| CDCC | Caribbean Development and Cooperation Committee |
| CDF | Common Data Format |
| CDFC | Cloud Depiction and Forecast System |
| CDIAC | Carbon Dioxide Information Analysis Center |
| CDP | Common Depth Point |
| CDR | Critical Design Review |
| CDW | Circumpolar Deep Water |
| CEA | Atomic Energy Commission |
| CEAREX | Coordinated Eastern Arctic Experiment |
| CECOLDO | CEntro COLombiano de Datos e información Oceanográfica |
| CECOLDO | Columbian National Oceanographic Data Centre |
| CEDDA | Center for Experiment Design and Data Analysis |
| CEDE | European Council on Environmental Law |
| CEES | Committee on Earth and Environmental Sciences |
| CEFAS | Centre for Environment, Fisheries, and Aquaculture Science |
| CEON | Circum-Arctic Environmental Observatory Network |