| Cirkus | Krnica |
| Cirrocumulus | Cirokumulus |
| Cirrostratus | Cirostratus |
| Cirrus | Cirus |
| Cisalpinska republiken | Cisalpinska republika |
| CISC | CISC |
| Cispadanska republiken | Cispadanska republika |
| Cisterciensorden | Cistercijani |
| citron | limona |
| citronmeliss | navadna melisa |
| Citronsyracykeln | Krebsov cikel |
| Citroën | Citroën |
| Citroën DS | Citroën DS |
| Citrusar | Citrus |
| citrusfrukt | agrumi |
| Citrussläktet | Citrus |
| cittra | cítre |
| City of Edinburgh | Edinburg |
| City of Glasgow | Glasgow |
| Cityakuten | ER |
| Ciudad del Carmen | Carmen |
| Ciurlionis | Mikalojus Konstantinas Čiurlionis |
| civil flygtrafik | civilni zračni promet |
| civil säkerhet | varnost ljudi |
| civilisation | civilizacija |
| Civilization | Civilization |
| civilrätt | rimsko pravo |
| civilskydd | zaščita civilnega prebivalstva |
| civilstånd | zakonski stan |
| CK | CK |
| CL | CL |
| Clamart | Clamart |
| Clara Schumann | Clara Schumann |
| Clara Zetkin | Clara Zetkin |
| Claude Debussy | Claude Debussy |
| Claude Jade | Claude Jade |
| Claude Monet | Claude Monet |
| Claude Shannon | Claude Elwood Shannon |
| Claudio López | Claudio López |
| Claudio Monteverdi | Claudio Monteverdi |
| Claudio Villa | Claudio Villa |
| Claudius | Klavdij I. |
| Clave | Ključ |
| Claves | Čembalo |
| Clay Regazzoni | Clay Regazzoni |
| Clearance | Razprodaja |
| Clement Attlee | Clement Attlee |
| Clement Coxsone Dodd | Clement Seymour Dodd |
| Clermont-Ferrand | Clermont-Ferrand |
| Cleveland | Cleveland |
| Clichy | Clichy |
| Clichy-sous-Bois | Clichy-sous-Bois |
| Cliff Burton | Cliff Burton |
| Clint Eastwood | Clint Eastwood |
| Clinton Davisson | Clinton Joseph Davisson |
| Clio | Klio |
| Clive Sinclair | Clive Sinclair |
| clown | klovn |
| Club América | Amerika |
| Club Brügge KV | Brugge |
| Clyde Tombaugh | Clyde Tombaugh |
| Cláudio Taffarel | Cláudio Taffarel |
| CMAS | CMAS |
| CMYK | Barvni model CMYK |
| CN Tower | CN Tower |
| CNC | NC |
| CO | CO |
| coach | trener |
| coacha | trenirati |
| Coatlicue | Coatlicue |
| COBOL | COBOL |
| Coca-Cola | Coca-Cola |
| Coca-Cola Company | Podjetje Coca-Cola |
| cocktail | koktejl |
| Coco Chanel | Gabrielle Chanel |
| Cocoon - djupets hemlighet | Kokon |
| Codex Alexandrinus | Aleksandrijski kodeks |
| Codex Vaticanus | Vatikanski kodeks |
| Coffeeshop | Bar |
| Cola | Kola |
| Colchester | Cambridge |
| Collage | Kolaž |
| Collatz antagande | Collatzova domneva |
| Colleen Fitzpatrick | Vitamin C |
| Colmar | Colmar |
| Colombes | Colombes |
| Colombia | Kolumbija |
| Colombian | Kolumbijec |
| Coloni | Enzo Coloni Racing Car Systems |
| Colonia del Sacramento | Colonia del Sacramento |
| Colorado | Kolorado |
| Coloradofloden | Reka Kolorado |
| Coloradoöknen | Kolorado |
| Colosseum | Kolosej |
| Colossus | Colossus |
| Coluccio Salutati | Coluccio Salutati |
| Columbia | Kolumbija |
| Columbiafloden | Kolumbija |
| Colón | Kolon |
| COM | COM |
| Comarca | Šajerska |
| Combs-la-Ville | Combs-la-Ville |
| Comet | Komet |
| Commando | Komandos |
| Commodore | Commodore |
| Common Gateway Interface | Common Gateway Interface |
| Comorerna | Komori 'm pl' |
| Compiègne | Compiègne |
| Component Object Model | COM |
| Compton | Compton |
| Comptonspridning | Comptonov pojav |
| Comté | Šajerska |
| Concerto grosso | Koncert |
| Concord | Concorde |
| Concorde | Concorde |
| Condoleezza Rice | Condoleezza Rice |
| Confessions Tour | Confessions tour |
| Conflans-Sainte-Honorine | Conflans-Sainte-Honorine |
| Congo | Kongo |
| Connaught Engineering | Connaught Engineering |
| Connecticut | Connecticut |
| Connecticutfloden | Connecticut River |
| Connew Racing Team | Connew |
| Conny Andersson | Conny Andersson |
| Constellationprogrammet | Ozvezdje |
| container | kontejner |
| Cooköarna | Cookovo otočje |
| Cooper | Cooper Car Company |
| Coopers test | Cooper |
| Copacabana | Copacabana |
| copernicium | kopernicij |
| Copleymedaljen | Copleyjeva medalja |
| Coppa Italia i fotboll | Coppa Italia |
| Coppa Italia і fotboll | Coppa Italia |
| copyright | avtorske pravice |
| Corazon Aquino | Corazon Aquino |
| CORBA | CORBA |
| Corbeil-Essonnes | Corbeil-Essonnes |
| Corinne Rey-Bellet | Corinne Rey Bellet |
| Corioliseffekten | Coriolisova sila |
| Cornwall | Cornwall |
| Coro | Pevski zbor |
| Corot | Corot |
| Corpus | Besedilni korpus |
| Corpus Christi | Sveto rešnje telo in kri |
| Corpus juris civilis | Justinijanov zakonik |
| Corrèze | Corrèze |
| Corsage | Bluza |
| Corse-du-Sud | Corse-du-Sud |
