| collaudo | test |
| Collaudo del software | Software testing |
| collaudo in loco | field test |
| collazione | collation |
| Colle del Galibier | Col du Galibier |
| Colle del Glandon | Col du Glandon |
| Colle del Lautaret | Col du Lautaret |
| Colle del Moncenisio | Mont Cenis |
| Colle del Monginevro | Col de Montgenèvre |
| Colle del Piccolo San Bernardo | Little St Bernard Pass |
| Colle del Tourmalet | Col du Tourmalet |
| Colle del Télégraphe | Col du Télégraphe |
| Colle della Cayolle | Col de la Cayolle |
| Colle della Forclaz | Col de la Forclaz |
| Colle della Maddalena | Maddalena Pass |
| Colle di Tenda | Col de Tende |
| Colle di Vars | Col de Vars |
| Colle palatino | Palatine Hill |
| Colle Vaticano | Vatican Hill |
| Colle Vento | Weathertop |
| Colleen Fitzpatrick | Vitamin C |
| Colleen McCullough | Colleen McCullough |
| collega | associate |
| collegamento | linkup |
| collegamento ferroviario | connection |
| Collegamento fisico | Hard link |
| collegamento radiofonico | audio transmission |
| Collegamento simbolico | Symbolic link |
| colleganza | colleagueship |
| collegare | connect |
| collegare a terra | earth |
| collegare con | tie up with |
| collegato | connected |
| college | college |
| College rock | College rock |
| collegiale | collegiate |
| collegio | college |
| Collegio cardinalizio | College of Cardinals |
| Collegio di Spagna | Collegio di Spagna |
| collegio elettorale | constituency |
| Collegio Europeo | College of Europe |
| collembolo | springtail |
| Collenberg | Collenberg |
| collera | furor |
| collerico | touchy |
| colletta | collection |
| collettivismo | collectivism |
