| Clone Wars | Kloonoorlogen |
| Clonmel | Clonmel |
| Cloud City | Cloud City |
| Club Brügge | Club Brugge |
| Clube de Regatas do Flamengo | CR Flamengo |
| Cluedo | Cluedo |
| Cluj | District Cluj |
| Cluj-Napoca | Cluj-Napoca |
| Cluny | Abdij van Cluny |
| Clyde Tombaugh | Clyde Tombaugh |
| Clásica de San Sebastián | Clásica San Sebastián |
| CMAS | Confédération Mondiale des Activités Subaquatiques |
| CMRR | Common Mode Rejection Ratio |
| CMYK | CMYK |
| CN Tower | CN Tower |
| CNC-maskine | CNC |
| CNN | CNN |
| Coahuila | Coahuila de Zaragoza |
| COBOL | COBOL |
| Coca-Cola | Coca-Cola |
| Cochise County | Cochise County |
| Cochlear Implant | Cochleair implantaat |
| Cockerspaniel | Engelse cockerspaniël |
| Coco Chanel | Coco Chanel |
| Coconino County | Coconino County |
| Cocosøerne | Cocoseilanden |
| Codec | Codec |
| Codex Alexandrinus | Codex Alexandrinus |
| Codex Argenteus | Codex Argenteus |
| Codex Gigas | Codex Gigas |
| Codex Leningradensis | Codex Leningradensis |
| Codex Sinaiticus | Codex Sinaiticus |
| Codex Vaticanus | Codex Vaticanus |
| Codon | Codon |
| Coelacanth | Coelacanten |
| Coenraad Jacob Temminck | Coenraad Jacob Temminck |
| Cofidis | Cofidis |
| cognac | cognac |
| Coimbra | Coimbra |
| Cojedes | Cojedes |
| Col du Tourmalet | Col du Tourmalet |
| cola | cola |
| Coldplay | Coldplay |
| Coleman Hawkins | Coleman Hawkins |
| Colima | Colima |
| Colin Farrell | Colin Farrell |
| Colin Firth | Colin Firth |
| Colin Greenwood | Colin Greenwood |
| Colin Maclaurin | Colin Maclaurin |
| Colin McRae | Colin McRae |
| Colin Powell | Colin Powell |
| Collatz-formodningen | Vermoeden van Collatz |
| Colleen McCullough | Colleen McCullough |
| Collision Course | Collision Course |
| Colombe | La Colombe |
| Colombes | Colombes |
| Colombia | Colombia |
| Colombo | Colombo |
| Colorado | Colorado |
| Colorado Avalanche | Colorado Avalanche |
| Colorado River | Colorado |
| Colorado Rockies | Colorado Rockies |
| Colosseum | Colosseum |
| Colossus | Colossus |
| Colt Canada | Diemaco |
| Columbia | Columbia |
| Columbia Records | Columbia Records |
| Columbia University | Columbia-universiteit |
| Columbus | Columbus |
| Columbus Blue Jackets | Columbus Blue Jackets |
| Columbus-æg | Ei van Columbus |
| Columbusmodulet | Columbus |
| COM | COM |
| Combine | Geallieerden |
| COMECON | Comecon |
| Comic Book Guy | Comic Book Guy |
| Comino | Comino |
| Commander Keen | Commander Keen |
| Commerzbank-Arena | Commerzbank-Arena |
| Commerzbank-Tower | Commerzbank Tower |
| Commewijne | Commewijne |
| Commodore Amiga | Amiga |
| Commodus | Commodus |
| Commonrail | Common-rail |
| Commonwealth of Nations | Gemenebest van Naties |
| Comorerne | Comoren |
| Comosøen | Comomeer |
| Company of Heroes | Company of Heroes |
| Compiègne | Compiègne |
| Comptonspredning | Compton-effect |
| computer | computer |
| Computer aided design | Computer Aided Design |
| Computer telephony integration | Computer Telephony Integration |
| Computergrafik | Computergraphics |
| Computerrollespil | Computer Role Playing Game |
| computerspil | computerspel |
| Computus | Paas- en Pinksterdatum |
| Conakry | Conakry |
| Conan the Barbarian | Conan the Barbarian |
| CONCACAF | CONCACAF |
| Concepción | Concepción |
| Concord | Concord |
| Concorde | Concorde |
| Concordia | Concordia |
| Concurrent Versions System | Concurrent Versions System |
| Condoleezza Rice | Condoleezza Rice |
| Condottiere | Condottieri |
| Coney Island | Coney Island |
| Confessiones | Confessiones |
| Confessions of a Teenage Drama Queen | Confessions of a Teenage Drama Queen |
| Confessions Tour | Confessions Tour |
| Confédération Africaine de Football | Confédération Africaine de Football |
| Conger | Conger |
| Conger ål | Conger |
| Congo | Kongo |
| Congofloden | Kongo |
| CONMEBOL | CONMEBOL |
| Conn Smythe Memorial Trophy | Conn Smythe Trophy |
| Connacht | Connacht |
| Connecticut | Connecticut |
| Connemara | Connemara pony |
| Conquer Online | Conquer Online |
| Constans | Constans I |
| Constantino Zaballa | Constantino Zaballa |
| Constantius I Chlorus | Constantius I Chlorus |
| Constantius II | Constantius II |
| Constanze Mozart | Constanze Weber |
| Constanţa | Constanţa |
| Constellation-programmet | Project Constellation |
