| Cthulhu | Cthulhu |
| Ctrl-Alt-Delete | Control-Alt-Delete |
| cténaire | ctenophore |
| cténophore | ctenophore |
| Ctésias | Ctesias |
| Ctésibios | Ctesibius |
| Ctésiphon | Ctesiphon |
| Cuanza | Cuanza River |
| Cuarnens | Cuarnens |
| Cuarny | Cuarny |
| Cuatro Torres Business Area | CTBA |
| Cuauhtémoc | Cuauhtémoc |
| Cuauhtémoc Cárdenas | Cuauhtémoc Cárdenas |
| Cuba | Cuba |
| Cuba libre | Cuba Libre |
| Cubain | Cuban |
| Cubaine | Cuban |
| Cubana | Cubana de Aviación |
| Cubane | Cubane |
| Cubase | Steinberg Cubase |
| cube | cube |
| Cube adouci | Snub cube |
| Cube Borg | Borg starships |
| Cube cosmique | Cosmic Cube |
| cube de glace | ice cube |
| Cube de Hilbert | Hilbert cube |
| Cube de Necker | Necker cube |
| Cube de Rubik | Rubik's cube |
| Cube impossible | Impossible cube |
| Cube magique | Magic cube |
| Cube magique parfait | Perfect magic cube |
| Cube tronqué | Truncated cube |
| Cube Zero | Cube Zero |
| Cubewano | Classical Kuiper belt object |
| Cubic Feet per Minute | Cubic feet per minute |
| cubique | cubic |
| cubisme | cubism |
| cubiste | cubist |
| cubitus | ulna |
| Cubo futurisme | Cubo-Futurism |
| Cuboctaèdre cubitronqué | Cubitruncated cuboctahedron |
| Cubohémioctaèdre | Cubohemioctahedron |
| Cuboméduse | Chironex fleckeri |
| Cubozoa | Box jellyfish |
| Cubs de Chicago | Chicago Cubs |
| Cubzac-les-Ponts | Cubzac-les-Ponts |
| Cuchulainn | Cúchulainn |
| Cucq | Cucq |
| Cucujoidea | Cucujoidea |
| cucul | vapid |
| cucul-la-praline | vapid |
| Cuculiformes | Cuculiformes |
| cucumiforme | cucumiform |
| Cucumis | Cucumis |
| Cucurbita | Cucurbita |
| Cucurbita pepo | Squash |
| Cucurbitaceae | Cucurbitaceae |
| Cucurbitacée | Cucurbitaceae |
| Cucurbitacées | Cucurbitaceae |
| Cucurbitales | Cucurbitales |
