| Clinofobie | Hypnofobi |
| Clint Eastwood | Clint Eastwood |
| Clinton | Clinton |
| Clipper | Klipper |
| clitoris | klitoris |
| Clitorishoed | Klitorisforhud |
| Clive Owen | Clive Owen |
| Clive Sinclair | Clive Sinclair |
| Clivia | Clivia |
| Cloacadieren | Kloakdyr |
| Clone Wars | Clone Wars |
| Clonmel | Clonmel |
| Cloud City | Cloud City |
| clown | klovn |
| club | klub |
| Club América | Amerika |
| Club Brugge | Club Brügge |
| Club Olimpia Asunción | Olympia |
| Club van Rome | Romklubben |
| Cluedo | Cluedo |
| Cluj | Cluj |
| Cluj-Napoca | Cluj-Napoca |
| Cluny | Cluny |
| Clusiafamilie | Perikon-familien |
| Clusterbom | Klyngebombe |
| Clyde Tombaugh | Clyde Tombaugh |
| Clymene | Klymene |
| Clásica San Sebastián | Clásica de San Sebastián |
| CM | Tv reklame |
| CMYK | CMYK |
| CN Tower | CN Tower |
| CNC | CNC-maskine |
| CNN | CNN |
| coach | træner |
| Coahuila de Zaragoza | Coahuila |
| Coalition Provisional Authority | Koalitionens civile administration i Irak |
| COBOL | COBOL |
| Coca-Cola | Coca-Cola |
| cocaïne | kokain |
| Cochise County | Cochise County |
| Cochleair implantaat | Cochlear Implant |
| Coco Chanel | Coco Chanel |
| Coconino County | Coconino County |
| Cocos Eilanden | Cocosøerne |
| Cocoseiland | Isla del Coco |
| Cocoseilanden | Cocosøerne |
| code | sprog |
| Code INSEE | CPR-nummer |
| Codec | Codec |
| codenaam | kodenavn |
| coderen | kryptere |
| Codex Alexandrinus | Codex Alexandrinus |
| Codex Argenteus | Codex Argenteus |
| Codex Gigas | Codex Gigas |
| Codex Hammurabi | Hammurabis lov |
| Codex Leningradensis | Codex Leningradensis |
| Codex Regius | Ældre Edda |
| Codex Sinaiticus | Codex Sinaiticus |
| Codex Vaticanus | Codex Vaticanus |
| Codomein | Værdimængde |
| Codon | Codon |
| Coelacanten | Coelacanth |
| Coelacanthen | Coelacanth |
| coeliakie | cøliaki |
| Coenraad Jacob Temminck | Coenraad Jacob Temminck |
| Coeus | Koios |
| Cofidis | Cofidis |
| cognac | cognac |
| Cognitie | Tænkning |
| cognitief | kognitiv |
| Cognitief proces | Tænkning |
| Cognitieve neurowetenschap | Neuropsykologi |
| cognitieve psychologie | kognitionspsykologi |
| Cognitieve Therapie | Kognitiv adfærdsterapi |
| Cognitiewetenschap | Tænkning |
| Cohors | Kohorte |
| Cohort | Kohort |
| Coiffure | Frisure |
| Coimbra | Coimbra |
| Coitus interruptus | Afbrudt samleje |
| Cojedes | Cojedes |
| Col du Tourmalet | Col du Tourmalet |
| cola | cola |
