| Abbreviation | Definition |
|---|---|
| CRS | Congressional Research Service |
| CS | Chief Scientist |
| CS | Committee on Seismology |
| C-SCAT | C-band Scatterometer |
| CSCS | Chukchi Sea Circulation Study |
| CSCS | Consolidated Scientific Computing System |
| CSES | Center for the Study of Earth from Space |
| CSG | Computer Support Group |
| CSI | Conditional Symmetric Instability |
| CSIRO | Commonwealth Scientific and Industrial Research Organization |
| CSK | Cooperative Study of the Kuroshio and Adjacent Regions |
| CSM | Climate System Monitoring |
| CSM | Cooperative Study in the Mediterranean |
| CSS | Central Support Services |
| CSTD | Center for Science and Technology for Development |
| CSU-RAMS | Colorado State University Regional Atmospheric Modeling System |
| CT | Cold Tongue |
| CTD | Conductivity-Temperature-Depth probe |
| CTDMPLUS | Improved Complex Terrain Dispersion Model |
| CTIP | Coupled Chermosphere-Ionosphere-Plasmasphere |