| Concord | Concorde |
| Concorde | Concorde |
| Concurrent Versions System | CVS |
| Condoleezza Rice | Condoleezza Riceová |
| Confédération Africaine de Football | Confederation of African Football |
| Congo | Kongo |
| Congofloden | Kongo |
| CONMEBOL | CONMEBOL |
| Connacht | Connacht |
| Connecticut | Connecticut |
| Constanţa | Constanţa |
| Constellation-programmet | Program Constellation |
| Consul | Konzul |
| Content Management System | Systém pro správu obsahu |
| Converse All-Star | Converse |
| Cook-øerne | Cookovy ostrovy |
| Cookie | HTTP cookie |
| Cookøerne | Cookovy ostrovy |
| Cool jazz | Cool jazz |
| Coppa Italia | Italský fotbalový pohár |
| Copyleft | Copyleft |
| Copyright | Autorské právo |
| Cordelia | Cordelia |
| Cordoba | Córdoba |
| Corioliseffekten | Coriolisova síla |
| Cork | Cork |
| Cornelius | Cornelius |
| Cornwall | Cornwall |
| Coruscant | Coruscant |
| Cosinusrelation | Kosinová věta |
| cost-benefit-analyse | analýza nákladů a přínosů |
| Costa Rica | Kostarika |
| Così fan tutte | Così fan tutte |
| Cotonou | Cotonou |
| Coulomb | Coulomb |
| Count Basie | Count Basie |
| Counter-Strike | Counter-Strike |
| Country | Country |
| County Cork | Cork |
| County Dublin | Dublin |
| County Galway | Galway |
| courgette | cuketa |
| Courteney Cox | Courteney Cox |
| Covasna | Covasna |
| Covent Garden | Covent Garden |
| Coventry | Coventry |
| Coverversion | Cover verze |
| cowboy | kovboj |
| Cowpers kirtel | Cowperova žláza |
| CPR-nummer | Rodné číslo |
| Cracker | Cracker |
| Cradle of Filth | Cradle of Filth |
| Craiova | Craiova |
| Crazy Horse | Splašený kůň |
| Creative Commons | Creative Commons |
| Creative writing | Tvůrčí psaní |
| creme | krém |
| cremefarve | krémový |
| cremefarvet | krémový |
| Cressida | Cressida |
| Creuse | Kroisos |
| Cristiano Ronaldo | Cristiano Ronaldo |
| CRM | Customer relationship management |
| croissant | rohlík |
| Crust punk | Crust |
| Crystal Palace | Crystal Palace FC |
| Créteil | Créteil |
| CSKA Moskva | PFC CSKA Moskva |
| CSS | Cascading Style Sheets |
| CSU | Křesťansko-sociální unie Bavorska |
| Ctesiphon | Ktésifón |
| Cuauhtémoc | Cuauhtémoc |
| Cuba | Kuba |
| Cuba Libre | Cuba Libre |
| Cubakrisen | Karibská krize |
| Cubanske revolution | Kubánská revoluce |
| Cui bono | Cui bono |
| Culture Haiti | Culture Haiti |
| Cumulus | Cumulus |
| Cunnilingus | Orální sex |
| Cunningham | Cunningham |
| Cunninghamhal | Cunningham |
| cup | pohár |
| Cupido | Cupid |
| Curie | Curium |
| Curitiba | Curitiba |
| curium | curium |
| Curling | Curling |
| Curriculum vitæ | Biografie |
| Cusco | Cuzco |
| Cutty Sark | Cutty Sark |
| Cyan | Dikyan |
| cyanat | kyanat |
| cyanid | kyanid |
| Cyankalium | Kyanid draselný |
| Cyanobakterie | Sinice |
| Cyberpunk | Kyberpunk |
| Cybersex | Počítačový sex |
| Cyclops | Kyklop |
| Cyclotrimethylenetrinitramine | Hexogen |
| Cygwin | Cygwin |
| cykel | kolo |
| cykelsti | stezka cyklistická |
| Cyklamat | Cyklamát |
| cykle | cyklistika |
| Cykling | Cyklistika |
| cyklist | cyklista |
| cyklon | cyklón |
