| Abbreviation | Definition |
|---|---|
| CLAN | Community Local Area Network |
| CLDAP | Connection-less Lightweight Directory Access Protocol |
| CLDC | Connected Limited Device Configuration |
| CLEC | Competitive Local Exchange Carrier |
| CLID | Calling Line IDentification |
| CLIP | Cell Loss Integration Period |
| CLiS | Corpus Linguistics in Scotland |
| CLNE | Customer Located Network Equipment |
| CLNET | Chicano-Latino Network |
| CLPD | Cell Loss Priority Discard |
| CM | Cable Modem |
| CM | Connection Management |
| CM | Content Management |
| CMAP | Connection Management Access Protocol |
| CMC | Communications Management Configuration |
| CMC | Computer Mediated Communications |
| CMD | Control and Monitoring Display |
| CMF | Common Management Foundation |
| CMID | Client Machine IDentification |
| CMIS | Computerized Management Information System |