| custodia protettiva | custodia preventiva |
| custodire | atender |
| custodire gelosamente | venerar |
| Custom | Motocicleta custom |
| Customer relationship management | CRM |
| customizzare | personalizar |
| customizzazione | personalización |
| CUT | CUT |
| cutaneo | epidérmico |
| Cutia que nisipo | Troaca du cisiposo |
| cuticola | epidermis |
| Cutie Honey | Cutie Honey |
| cutrettola | aguzanieves |
| Cuts from the Crypt | Cuts from the Crypt |
| Cuttoli Corticchiato | Cuttoli-Corticchiato |
| Cuttura | Citera |
| Cutty Sark | Cutty Sark |
| Cuvette | Cuvette |
| Cuvieronius | Cuvieronius |
| Cuxhaven | Distrito de Cuxhaven |
| Cuzance | Cuzance |
| Cuzdrioara | Cuzdrioara |
| CV | CV |
| CX | Cx |
| Cyanobacteria | Cyanobacteria |
| Cyanocitta | Cyanocitta |
| cyanocitta cristata | urraca de América |
| Cyanocitta stelleri | Cyanocitta stelleri |
| Cyanoliseus patagonus | Cyanoliseus patagonus |
| Cyanopsitta spixii | Cyanopsitta spixii |
| Cyberbullismo | Ciber-acoso |
| Cybercafe | Cibercafé |
| Cybercultura | Cibercultura |
| Cyberpunk | Cyberpunk |
| Cybersesso | Cibersexo |
| cyberspazio | ciberespacio |
| cyborg | ciborg |
| Cycadaceae | Cycas |
| Cycadales | Cycas |
| Cycadophyta | Cycadophyta |
| Cycas | Cycas |
| Cycas revoluta | Cycas revoluta |
| Cyclamen | Cyclamen |
| Cyclamen persicum | Cyclamen persicum |
| Cyclamen purpurascens | Cyclamen purpurascens |
| Cyclamen repandum | Cyclamen repandum |
| cyclette | bicicleta estática |
| Cyclic redundancy check | Control de redundancia cíclica |
| Cyclopaedia | Cyclopaedia |
| Cyclura cornuta stejnegeri | Cyclura cornuta stejnegeri |
| Cydonia oblonga | Cydonia oblonga |
| Cygnus | Cygnus |
| Cygnus atratus | Cygnus atratus |
| Cygnus cygnus | Cygnus cygnus |
| Cygnus olor | Cygnus olor |
| Cygwin | Cygwin |
| Cylindropuntia | Cylindropuntia |
| Cyloni | Cylon |
| Cymbopogon | Cymbopogon |
| Cynara cardunculus | Cynara cardunculus |
| Cynara scolymus | Cynara scolymus |
| Cyndi Lauper | Cyndi Lauper |
| Cynegils del Wessex | Cynegils de Wessex |
| Cynodon dactylon | Cynodon dactylon |
| Cynodontia | Cynodontia |
| Cynogale bennettii | Cynogale Bennettii |
| Cynoglossum | Cynoglossum |
| Cynognathus | Cynognathus |
| Cynomys | Perrito de la pradera |
| Cynthia Rothrock | Cynthia Rothrock |
| Cyperaceae | Cyperaceae |
| Cyperus | Cyperus |
| Cyperus alternifolius | Cyperus alternifolius |
| Cyperus esculentus | Cyperus esculentus |
| Cyperus papyrus | Cyperus papyrus |
| Cyphomandra betacea | Cyphomandra betacea |
| Cypress Hill | Cypress Hill |
| Cypria | Cipria |
| Cyprinidae | Cyprinidae |
| Cypriniformes | Cypriniformes |
| Cyprinodontidae | Cyprinodontidae |
| Cyprinodontiformes | Atheriniformes |
| Cyprinus | Cyprinidae |
| Cyprinus carpio | Cyprinus carpio |
| Cypripedium acaule | Cypripedium acaule |
| Cypripedium calceolus | Cypripedium calceolus |
| Cyril Northcote Parkinson | Cyril Northcote Parkinson |
| Cystophora cristata | Eira barbara |
| Cytisus scoparius | Retama sphaerocarpa |
| CZ | Catanzaro |
| Czech Airlines | Czech Airlines |
| Czeslaw Milosz | Czesław Miłosz |
| Czesław Niemen | Czesław Niemen |
| Częstochowa | Częstochowa |
| Càlig | Cálig |
| Cànoves i Samalús | Cánoves |
| Càrcer | Cárcer |
| Cáceres | Cáceres |
| Cádice | Cádiz |
| Cádiz Club de Fútbol | Cádiz Club de Fútbol |
| Cándido López | Cándido López |
| Cáo Cāo | Cao Cao |
| Cássio de Souza Soãres | Lincoln |
| Câmara de Lobos | Câmara de Lobos |
| Câmpia Turzii | Câmpia Turzii |
| Câţcău | Câţcău |
| Cão da Serra da Estrela | Cão da Serra da Estrela |
| Cão da Serra de Aires | Cão da Serra de Aires |
| Cão de Fila de São Miguel | Cão de Fila de São Miguel |
| Cædmon | Caedmon |
| Cédric Pioline | Cédric Pioline |
| Cédric Roussel | Cédric Roussel |
| Célestin Freinet | Celestin Freinet |
| Céligny | Céligny |
| Céline Dion | Céline Dion |
| Céret | Distrito de Céret |
| César Franck | César Franck |
| César Rodríguez Álvarez | César Rodríguez |
| César Vallejo | César Vallejo |
| Cìano | Cian |
