| cuáquero | Quäker |
| cuévano | Korb |
| cuídate | mach's gut |
| cuña | Bremskeil |
| cuñada | Schwägerin |
| cuñado | Schwager |
| cuño | Siegel |
| CV | CV |
| CVS | Concurrent Versions System |
| CW | Continuous wave |
| Cx | CX |
| cyanobacteria | Blaualgen |
| Cyanochen cyanopterus | Blauflügelgans |
| Cyanocitta cristata | Blauhäher |
| Cyanocitta stelleri | Diademhäher |
| Cyanopica cyanus | Blauelster |
| Cyanopsitta spixii | Spix-Ara |
| Cyathea | Cyathea |
| Cyatheales | Baumfarne |
| Cyberpunk | Cyberpunk |
| Cyborg | Cyborg |
| Cycadaceae | Cycas |
| Cycadatae | Palmfarne |
| Cycadophyta | Palmfarne |
| Cycas | Palmfarne |
| Cycas revoluta | Japanischer Palmfarn |
| Cyclamen | Alpenveilchen |
| Cyclamen persicum | Zimmer-Alpenveilchen |
| Cyclamen purpurascens | Europäisches Alpenveilchen |
| Cyclamen repandum | Geschweiftblättriges Alpenveilchen |
| Cyclanthaceae | Scheibenblumengewächse |
| Cyclanthera pedata | Caigua |
| Cycliophora | Cycliophora |
| Cyclopaedia | Cyclopaedia |
| Cyclopes didactylus | Zwergameisenbär |
| Cyclorana | Cyclorana |
| Cydia pomonella | Apfelwickler |
| Cydonia Mensae | Cydonia Mensae |
| Cydonia oblonga | Quitte |
| Cygnus | Schwan |
| Cygnus atratus | Trauerschwan |
| Cygnus bewickii | Zwergschwan |
| Cygnus buccinator | Trompeterschwan |
| Cygnus columbianus | Zwergschwan |
| Cygnus cygnus | Singschwan |
| Cygnus melancoryphus | Schwarzhalsschwan |
| Cygnus olor | Höckerschwan |
| Cygwin | Cygwin |
| Cylon | Kylon |
| Cymbalaria | Zimbelkräuter |
| Cymbalaria muralis | Zimbelkraut |
| Cymbopogon | Zitronengras |
| Cymbopogon citratus | Zitronengras |
| Cymodoceaceae | Cymodoceaceae |
| Cynara | Cynara |
| Cynara cardunculus | Disteln |
| Cynara scolymus | Artischocke |
| Cyndi Lauper | Cyndi Lauper |
| Cynegils de Wessex | Cynegils |
| Cynipidae | Gallwespen |
| Cynipoidea | Gallwespen |
| Cynogale Bennettii | Otterzivette |
| Cynoglossum | Hundszunge |
| Cynognathus | Cynognathus |
| Cynops | Ostasiatische Wassermolche |
| Cynthia Rothrock | Cynthia Rothrock |
| Cyperaceae | Sauergrasgewächse |
| Cyperus | Zypergräser |
| Cyperus alternifolius | Zypergras |
| Cyperus esculentus | Erdmandel |
| Cyperus papyrus | Echter Papyrus |
| Cyphomandra betacea | Tamarillo |
| Cypress Hill | Cypress Hill |
| Cyprien Ntaryamira | Cyprien Ntaryamira |
| Cyprinidae | Karpfenfische |
| Cypriniformes | Karpfenartige |
| Cyprinodontidae | Eierlegende Zahnkarpfen |
| Cyprinus carpio | Karpfen |
| Cypripedium | Cypripedium |
