| Abbreviation | Definition |
|---|---|
| CELIAS | Charge, Element and Isotope Analysis System |
| CELSS | Controlled Environment and Life Support System |
| CELT | California Extremely Large Telescope |
| CELV | Complementary Expendable Launch Vehicle |
| CEPAC | COSTEP (Comprehensive Supra-Thermal and Energetic Particle Analyzer)-ERNE (Energetic and Relativistic Nuclei and Electron experiment) Particle Analysis Collaboration |
| CEPAC | COSTEP-ERNE Particle Analysis Collaboration |
| CER | Controlled Energy Release |
| CERT | CERTification |
| CERV | Crew Emergency Return Vehicle |
| CES | Complete Equipment Schedule |
| CES | Control Electronics System |
| CES | Crew Escape System |
| CESC | CSA (Canadian Space Agency) Engineering Support Center |
| CETA | Crew and Equipment Translation Aid |
| CETF | Critical Evaluation Task Force |
| CEU | Control Electronics Unit |
| CEV | Crew Exploration Vehicle |
| CF | Carrier Frequency |
| CF | Center Forward |
| CF | Centrifugal Force |