| Club Marquee | Marquee Club |
| Club Nacional de Football | Club Nacional de Football |
| Club Nintendo | Club Nintendo |
| Club Olimpia | Olimpia Asunción |
| Club San Luis | San Luis Futbol Club |
| Club Social de Deportes Rangers | Rangers de Talca |
| Club Sport Emelec | Club Sport Emelec |
| Club Sport Marítimo | CS Marítimo |
| Club Sportif Sedan Ardennes | CS Sedan |
| Club Winx | Winx Club |
| Clube Atlético Mineiro | Atlético Mineiro |
| Clube de Futebol Estrela da Amadora | CF Estrela da Amadora |
| Clube de Futebol Os Belenenses | CF Os Belenenses |
| Clube de Regatas Brasil | Clube de Regatas Brasil |
| Clube de Regatas do Flamengo | CR Flamengo |
| Clube Desportivo das Aves | CD Aves |
| Clube Desportivo Nacional | CD Nacional |
| Clube Sport Marítimo | CS Marítimo |
| Clue | Cluedo |
| Clueless | Clueless |
| Clugin | Clugin |
| Cluj | Cluj |
| Cluj-Napoca | Cluj-Napoca |
| Cluny | Cluny |
| Clupeidae | Sillfiskar |
| Clupeiformes | Sillartade fiskar |
| clutch | koppling |
| Clyde Tombaugh | Clyde Tombaugh |
| Clásica de San Sebastián | Clásica de San Sebastián |
| clásico | klassisk |
| Clásico Mundial de Béisbol | World Baseball Classic |
| Cláudio Taffarel | Cláudio Taffarel |
| cláusula | klausul |
| Cláusula filioque | Filioque |
| Clémence Poésy | Clémence Poésy |
| Cléo de Mérode | Cléo de Mérode |
| Cléveris | Kleve |
| clímax | klimax |
| Clímene | Asia |
| clínica | klinik |
| clínico | klinisk |
| Clío | Klio |
| clítoris | klitoris |
| clóset | garderob |
| CMTS | CMTS |
| CN | CN |
| CNC | CNC |
| Cneo Cornelio Escipión Asina | Gnaeus Cornelius Scipio Asina |
| Cneo Julio Agrícola | Gnaeus Julius Agricola |
| Cneo Pompeyo Magno | Pompejus |
| Cnidaria | Nässeldjur |
| CNN | CNN |
| Cnosos | Knossos |
| CO | CO |
| co-incineración | medförbränning |
| Coacalco | Coacalco de Berriozábal |
| coacción | begär |
| coagulación | koagulering |
| coagulado | klumpig |
| coagulante | koagel |
| coagular | tjockna |
| coagularse | koagulera |
| Coahuila | Coahuila |
| Coahuila de Zaragoza | Coahuila |
| coalescedor | koalesator |
| coalición | block |
