| Citrus | Citrussläktet |
| Città di Castello | Città di Castello |
| City of Edinburgh | City of Edinburgh |
| City of God | Guds stad |
| City of Heroes | City of Heroes |
| City of London | City of London |
| Citytunneln | Citytunneln |
| Ciudad Guatemala | Guatemala City |
| Ciudad Juárez | Juárez |
| civil | civil |
| civil luftfart | civil flygtrafik |
| civilbefolkningens sikkerhed | civil säkerhet |
| civilbeskyttelse | civilskydd |
| Civilisation | Civilisation |
| civilisering | civilisering |
| Civilization | Sid Meier's Civilization |
| Civilregistrering | Folkbokföring |
| civilret | civilrätt |
| Civiløkonom | Civilekonom |
| CKY | Camp Kill Yourself |
| Claire Littleton | Claire Littleton |
| clairvoyance | klärvoajans |
| clairvoyant | klärvoajant |
| Clancy Wiggum | Clancy Wiggum |
| Clara | Klara |
| Clara af Assisi | Klara av Assisi |
| Clara Bow | Clara Bow |
| Clara Schumann | Clara Schumann |
| Clara Zetkin | Clara Zetkin |
| Clarence Seedorf | Clarence Seedorf |
| Clarion | Clarion |
| Clarion programmering | Clarion |
| Clark Gable | Clark Gable |
| Claude Adrien Helvétius | Claude Adrien Helvétius |
| Claude Chabrol | Claude Chabrol |
| Claude Debussy | Claude Debussy |
| Claude Jade | Claude Jade |
| Claude Monet | Claude Monet |
| Claudia Cardinale | Claudia Cardinale |
| Claudio Monteverdi | Claudio Monteverdi |
| Claudius | Claudius |
| Claudius II | Claudius II Gothicus |
| Claus von Stauffenberg | Claus Schenk von Stauffenberg |
| Claves | Claves |
| Clavicula | Nyckelben |
| Clemens af Alexandria | Clemens av Alexandria |
| Clemens Brentano | Clemens Brentano |
| Clement Attlee | Clement Attlee |
| Cleopatra Selene | Kleopatra Selene II |
| Clermont-Ferrand | Clermont-Ferrand |
| Cletus Spuckler | Cletus Spuckler |
| Cleveland | Cleveland |
| Cleveland Browns | Cleveland Browns |
| Cleveland Indians | Cleveland Indians |
| Cliff Burton | Cliff Burton |
| Cliff Richard | Cliff Richard |
| Cliffony | Cliffony |
| Clint Eastwood | Clint Eastwood |
| Clinton | Clinton |
| Clipper | Cutty Sark |
| Clive Owen | Clive Owen |
| Clive Sinclair | Clive Sinclair |
| Clodomer | Chlodomer |
| Clonmel | Clonmel |
| Cloud City | Molnstaden |
| cloudcomputing | datormoln |
| Cloudsat | Cloudsat |
| Club Brügge | Club Brügge KV |
| Clube de Regatas do Flamengo | CR Flamengo |
| Cluedo | Cluedo |
| Cluj | Cluj |
| Cluj-Napoca | Cluj-Napoca |
| Cluny | Cluny |
| Clyde Tombaugh | Clyde Tombaugh |
| Clymenedelfin | Hjälmdelfin |
| Clásica de San Sebastián | Clásica de San Sebastián |
| CMAS | CMAS |
| CMYK | CMYK |
| CN Tower | CN Tower |
| CNC-maskine | CNC |
| CNN | CNN |
| CNT | Confederación Nacional del Trabajo |
| Coahuila | Coahuila |
| coating | beläggning |
| COBOL | COBOL |
| COBRA | Cobra |
| Coca-Cola | Coca-Cola |
| Cochenillelus | Kochenillsköldlus |
| Cochise County | Cochise County |
| Cochlear Implant | Cochleaimplantat |
| Cockerspaniel | Engelsk cocker spaniel |
| Cocktail | Cocktail |
| Coco Chanel | Coco Chanel |
| Coconino County | Coconino County |
| Cocosøerne | Kokosöarna |
| Codec | Codec |
| Codex Alexandrinus | Codex Alexandrinus |
| Codex Argenteus | Silverbibeln |
| Codex Gigas | Djävulsbibeln |
| Codex Leningradensis | Leningradkodexen |
| Codex Sinaiticus | Codex Sinaiticus |
| Codex Vaticanus | Codex Vaticanus |
| Coelacanth | Tofsstjärtfiskar |
| Coenraad Jacob Temminck | Coenraad Jacob Temminck |
| Coenzym | Koenzym |
| Cofidis | Cofidis |
| Cognac | Konjak |
| Coimbra | Coimbra |
| Coitus reservatus | Coitus reservatus |
| Cola | Cola |
| Colantonio | Colantonio |
| Cold open | Teaser |
| Coldplay | Coldplay |
| Coleman Hawkins | Coleman Hawkins |
| Coleslaw | Coleslaw |
| colibakterier | koliforma bakterier |
| Colima | Colima |
| Colin Farrell | Colin Farrell |
| Colin Firth | Colin Firth |
| Colin Maclaurin | Colin Maclaurin |
| Colin McRae | Colin McRae |
| Colin Powell | Colin Powell |
| Collage | Collage |
| Collagen | Kollagen |
| Collatz-formodningen | Collatz antagande |
| Colleen McCullough | Colleen McCullough |
| collie | collie |
| Collision Course | Collision Course |
| Colombe | Duvan |
| Colombes | Colombes |
| Colombia | Colombia |
| Colombo | Colombo |
| Colorado | Colorado |
| Colorado Avalanche | Colorado Avalanche |
| Colorado River | Coloradofloden |
| Colorado Rockies | Colorado Rockies |
| Colosseum | Colosseum |
| Colossus | Colossus |
| Columbia | Columbia |
| Columbia Records | Columbia |
| Columbia University | Columbia University |
| Columbus | Columbus |
