| | cao | | ciao |
| | CAPEX | | capital expenditure |
| | cars | | Corrective Action Reports |
| | case | | Completely Absurd Sarcastic Explanation |
| | Catharsis | | cleansing |
| | CATI | | computer aided telephone interviewing |
| | CATV | | Cable Television service |
| | CATV | | cable TV |
| | CBAH | | Charity begins at home |
| | cbar | | ciao, bye, au revoir |
| | CBD | | Central Business District |
| | CBGB | | Country, Blue Grass and Blues |
| | CBI | | Computer-based instruction |
| | CBJ | | covered blow job |
| | CBJTC | | covered blowjob to completion |
| | CBL | | Come Back Later |
| | CBR | | Constant Bit rate |
| | CBS | | Cable Broadcast Service |
| | CBWFQ | | Class-Based Weighted Fair Queuing |
| | CC | | can't complain |
| | CC | | Carbon Copy |
| | CC | | Carbon Copy; Courtesy Copy |
| | CC | | credit card |
| | CCABW | | chief cook and bottle washer |
| | CCAR | | Compact car |
| | CCCD | | Copy-Control CD |
| | CCD | | charge-coupled device |
| | CCD | | Charge-Coupled Devices |
| | CCFL | | Cold Cathode Fluorescent Lamp |
| | CCG | | Castor Cracking Group |
|