| Copper–chlorine cycle | Copperbelt Province | Copperhill, Tennessee |
| Coppertone Loquat | Coppock, Iowa | Coprinaceae |
| Coprinus | Coprinus amphibius | Coprinus aquatilis |
| Coprinus arenarius | Coprinus candidatus | Coprinus collinus |
| Coprinus comatus | Coprinus flavus | Coprinus microsporus |
| Coprinus nemoralis | Coprinus pallidissimus | Coprinus silvaticus |
| Coprinus stellatus | Coprinus velox | Coproduction (society) |
| Coprophilia | Coprotus niveus | Coptic TV |
| Coptis | Coptis chinensis | Coptoideae |
| Coptology | Copts | Copula (linguistics) |
| Copula linguae | Copyleft | Copyright |
| Copyright abolition | Copyright infringement | Copywriter |
| Copywriting | Coquelles | Coquette (film) |
| Coquille, Oregon | Cor triatriatum | Coracias |
| Coracias abyssinicus | Coracias benghalensis | Coracias caudatus |
| Coracias cyanogaster | Coracias garrulus | Coracias naevia |
| Coracias naevius | Coracias spatulatus | Coracias temminckii |
| Coracii | Coraciidae | Coraciiformes |
| Coracioidea | Coracobrachialis muscle | Coragyps atratus |
| Coraima Torres | Coral | Coral 66 |
| Coral cut | Coral Gables, Florida | Coral reef |
| Coral reef fish | Coralan | Coraline (film) |
| Corallium rubrum | Corals | Coralville, Iowa |
| Corana | Corazón valiente | Corazon Aquino |
| CORBA | Corbehem | Corbel |
| Corbin Bleu | Corbin, Kentucky | Corbula |
| Corchorus | Corchorus olitorius | Corcoran, Minnesota |
| Cord blood | Cordeauxia | Cordeauxia edulis |
| Corded Ware culture | Cordele, Georgia | Cordell Hull |
| Cordem. | Cordia | Cordia africana |
| Cordia americana | Cordia bahamensis | Cordia glabrata |
| Cordia iberica | Cordia inermis | Cordia myxa |
| Cordia silvestris | Cordia sinensis | Cordia subcordata |
| Cordioideae | Cordite | Cordova, Alaska |
| Cordova, Illinois | Cordova, Nebraska | Cordova, South Carolina |
| Cordyceps | Cordycipitaceae | Cordyline |
| Cordyline australis | Cordyline banksii | Cordyline fruticosa |
| Cordyline petiolaris | Cordyline rubra | Core competency |
| Core Design | Core eudicots | Core i7 |
| Core i7 proccessor | Core product | Coregonidae |
| Coregoninae | Coregonus | Coregonus alpenae |
| Coregonus alpinus | Coregonus arenicolus | Coregonus artedi |
| Coregonus austriacus | Coregonus autumnalis | Coregonus baicalensis |
| Coregonus bavaricus | Coregonus candidus | Coregonus chadary |
| Coregonus clupeaformis | Coregonus clupeoides | Coregonus confusus |
| Coregonus danneri | Coregonus duplex | Coregonus fera |
| Coregonus hiemalis | Coregonus hoyi | Coregonus huntsmani |
| Coregonus johannae | Coregonus laurettae | Coregonus lavaretus |
| Coregonus maraena | Coregonus maxillaris | Coregonus megalops |
| Coregonus muksun | Coregonus nasus | Coregonus nelsonii |
| Coregonus nigripinnis | Coregonus nobilis | Coregonus oxyrinchus |
| Coregonus reighardi | Coregonus sardinella | Coregonus subautumnalis |
| Coregonus ussuriensis | Coregonus wartmanni | Coregonus widegreni |
| Coregonus zuerichensis | Coregulation | Corel |
| Corel Painter | Corel Photo-Paint | Corel VideoStudio |
| CorelDraw | CorelDRAW | Coreopsideae |
| Coreopsidinae | Coreopsis | Coreopsis abyssinica |
| Coreopsis angustifolia | Coreopsis arizonica | Coreopsis aurea |
| Coreopsis brasiliensis | Coreopsis californica | Coreopsis coronata |
| Coreopsis gigantea | Coreopsis grandiflora | Coreopsis insularis |
| Coreopsis integra | Coreopsis integrifolia | Coreopsis intermedia |
| Coreopsis lanceolata | Coreopsis maritima | Coreopsis mutica |
| Coreopsis nodosa | Coreopsis peruviana | Coreopsis pulchra |
| Coreopsis rosea | Coretta Scott King | Corey Brewer |
| Corey Bringas | Corey May | Corey Maynard |
| Corfu, New York | Cori cycle | Corian |
| Coriandreae | Coriandrum | Coriandrum digitatum |
| Coriandrum latifolium | Coriandrum maritimum | Coriandrum melphitense |
| Coriandrum sativum | Coriandrum setifolium | Coriandrum tordylium |
| Corideae | Corin Nemec | Corinna, Maine |
| Corinne, Utah | Corinth (village), New York | Corinth, Arkansas |
| Corinth, Kentucky | Corinth, Maine | Corinth, Mississippi |
| Corinth, New York | Corinth, Texas | Corinth, Vermont |
| Corinthian order | Coriolis effect | Coris |
| Coris (fish) | Coris (plant) | Coris atlantica |
| Coris aurilineata | Coris aygula | Coris batuensis |
| Coris caudimacula | Coris cuvieri | Coris dorsomacula |
| Coris flavovittata | Coris gaimard | Coris julis |
| Coris monspeliensis | Coris picta | Coris pictoides |
| Coris roseoviridis | Coris variegata | Coris venusta |
| Cork (material) | Cork borer | Cork City F.C. |
| Corleone | Cormont | Cormoran Strike |
| Corn allergy | Corn Belt | Corn da Camp |
| Corn da Tinizong | Corn oil | Corn starch |
| Corn stover | Corn syrup | Corn tortilla |
| Corn, Oklahoma | Cornaceae | Cornale |
| Cornales | Cornanae | Corne de Sorebois |
| Cornea | Cornea plana | Cornea plana 1 |
| Cornea plana 2 | Corneal abrasion | Corneal epithelium |
| Corneal limbus | Corneal ulcer | Corned beef |
| Corneille Heymans | Cornelia de Lange Syndrome | Cornelia Funke |
| Cornelia, Georgia | Cornelis Kalkman | Corneliu Papură |
| Corneliu Robe | Cornelius the Centurion | Cornelius Van Alen Van Dyck |
| Cornelius Vanderbilt | Cornelius, North Carolina | Cornelius, Oregon |
| Cornell Glen | Cornell Township, Michigan | Cornell University |
| Cornell, Illinois | Cornell, Wisconsin | Corner kick |
| Cornerstone | Cornersville, Tennessee | Cornettes de Bise |
| Corniche | Cornidae | Corning (city), New York |
| Corning, Arkansas | Corning, Iowa | Corning, Kansas |
| Corning, Missouri | Corning, Ohio | Corning, Wisconsin |
