| Abbreviation | Definition |
|---|---|
| COTR | Contracting Officer's Technical Representative |
| COWRR | Committee On Water Resources Research |
| CPC | Condensation Particle Counter |
| CPDS | Commerce Procurement Data System |
| CPMC | Claude Peteet Mariculture Center |
| CPPS | Permanent Commission for the South Pacific |
| CPPT | Polynesian Tsunami Warning Center |
| CPR | Continuous Plankton Recorder |
| CPSW | Central Puget Sound Watershed |
| CPUE | Catch Per Unit of Effort |
| CRA | Coral Reef Assessment |
| CRAB | Coastal, Rural, And Beyond |
| CRAP | Coral Reef Assessment Program |
| CRDC | Climate Research Data Center |
| CRDTOOLS | Climate Research Data tools |
| CREAMS | Circulation Research of East Asian Marginal Seas |
| CREEP | Changing Relief And Evolving Ecosystem Project |
| CRF | Cloud Radiation Feedback |
| CRRB | Change Request Review Board |
| CRRI | Coral Reef Research Institute |