| Abkürzung | Bereich | Staat | Bedeutung |
| C | Physik | Kapazität | |
| Wärmekapazität | |||
| c | Physik | Schallgeschwindigkeit | |
| spezifische Wärmekapazität | |||
| CAAD | Computer | Computer Aided Architectural Design | |
| CAD | Computer | Computer Aided Design (Computerunterstütztes zeichnen) | |
| CADAM | Computer | Computer Aided Design And Manufacturing | |
| CADMAT | Computer | Computer Aided Design, Manufacturing and Testing | |
| CAE | Computer | Computer Aided Engineering (Computerunterstütztes entwickeln) | |
| CAI | Computer | Computer Assisted Industry | |
| CAIT | Computer | Computer Aided Inspection and Testing | |
| CAL | Allgemein | GB | Calendar (Kalender) |
| Computer | Computer Aided Learning (Computerunterstütztes lernen) | ||
| CALTECH | Institut | USA | California Institute of Technology |
| CAM | Computer | Computer Aided Manufacturing (Computerunterstützte Fertigung) | |
| CAMD | Computer | Computer Aided Molecular Design | |
| CAN | Staat | Canada | |
| CAP | Computer | Computer Aided Planning (Computerunterstützte Planung) | |
| CAPI | Software | Common Application Programmer's Interface | |
| CAQ | Computer | Computer Aided Quality Assurance (Computerunterstützte Qualitätssicherung) | |
| CAS | Computer | Computer Aided Service (Computerunterstützter Kundendienst) | |
| D | Computergestützte Algebra-Systeme | ||
| CASE | Computer | Computer Aided Software Engineering (Computerunterstützte Anwendungsentwicklung) | |
| CAU | Technik | Computer Access Unit | |
| CBASIC | Software | Commercial Beginners' All Purpose Symbolic Instruction Code (Programmiersprache) | |
| CBL | Computer | Computer Based Learning | |
| CBR | Computer | Constant Bit Rate | |
| CBT | Computer | Computer Based Training | |
| CBW | Software | Convert Byte to Word | |
| CC | Computer | Cluster Controller | |
| CCC | Verein | D | Chaos Computer Club |
| CCS | Computer | Common Communication Support | |
| CCU | Computer | Compact Disk | |
| CD | Technik | Central Communcation Unit | |
| Color Display | |||
| Computer | Change Directory | ||
| CD-ROM | Technik | Compact Disk - Read Only Memory | |
| CD-ROM | Technik | Compact Disk - Read Only Memory | |
| CD-V | Technik | Compact Disk - Video | |
| CDI | Technik | Compact Disk Interactive | |
| CDR | Software | Corel Draw | |
| CDU | Partei | D | Christliche Demokratische Union |
| CDV | Technik | Compact Disk - Video | |
| CEN | Institut | EU | Comite Europeen de Normalisation |
| Normung | |||
| CGA | Computer | Color Graphics Adapter | |
| CGI | Computer | Computer Graphics Interface |