| C-klav | C clef |
| C-Netz | C-Net |
| C-One | C-One |
| C-reaktivt protein | C-reactive protein |
| C.S. Lewis | C. S. Lewis |
| C.T.R. Wilson | Charles Thomson Rees Wilson |
| ca | approx |
| CA Boca Juniors | Club Atlético Boca Juniors |
| Ca floden | Ca River |
| CA Independiente | Club Atlético Independiente |
| Ca Mau | Ca Mau |
| CA Osasuna | CA Osasuna |
| CA Platense | Club Atlético Platense |
| CA River Plate | Club Atlético River Plate |
| CA San Lorenzo de Almagro | Club Atlético San Lorenzo de Almagro |
| Cabanatuan City | Cabanatuan City |
| Cabaret | Cabaret |
| Cabbio | Cabbio |
| Cabernet Franc | Cabernet Franc |
| Cabernet Sauvignon | Cabernet Sauvignon |
| Cabimas | Cabimas |
| Cabinet noir | Black room |
| Cabinet Office Briefing Rooms | Cabinet Office Briefing Rooms |
| Cable Guy | The Cable Guy |
| Cabo Delgado | Cabo Delgado Province |
| Cabora Bassa | Cahora Bassa |
| Cabrales | Cabrales cheese |
| cabriolet | convertible |
| Cacau | Cacau |
| Cachan | Cachan |
| Cachaça | Cachaça |
| Cache | Cache |
| cacheminne | cache |
| Cachoeira do Sul | Cachoeira do Sul |
| CAD | Computer-aided design |
| Cadbury Schweppes | Cadbury Schweppes |
| caddie | caddie |
