| cider | cider |
| Ciderhusreglerna | The Cider House Rules |
| CIE | International Commission on Illumination |
| Ciego de Ávila | Ciego de Ávila Province |
| CIELAB | Lab color space |
| Cienfuegos | Cienfuegos Province |
| Cieszyn | Cieszyn |
| cigarett | cigarette |
| Cigarette Smoking Man | Cigarette Smoking Man |
| cigarettfimp | butt |
| cigarill | cheroot |
| cigarr | cigar |
| cigarrett | cigarette |
| Cigarrhaj | Cookie-cutter shark |
| Cigerxwîn | Cigerxwîn |
| cigg | smoke |
| Cigánd | Cigánd |
| CIH | CIH |
| Cijevna | Cijevna River |
| cikada | cicada |
| ciklid | cichlid |
| cikoria | chicory |
| cilie | cilium |
| Cimabue | Cimabue |
| Cimadera | Cimadera |
| Cimetière des Chiens | Cimetière des Chiens |
| Cincinnati Bengals | Cincinnati Bengals |
| Cincinnati Kid | The Cincinnati Kid |
| Cincinnati Mighty Ducks | Cincinnati Mighty Ducks |
| Cincinnati Reds | Cincinnati Reds |
| Cincinnatus | Cincinnatus |
| CINCPAC | United States Pacific Command |
| Cinderella Man | Cinderella Man |
| Cindy Crawford | Cindy Crawford |
| Cinerama | Cinerama |
| Cinna | Lucius Cornelius Cinna |
| cinnober | vermilion |
| cinnoberfärg | vermilion |
| Cinque ports | Cinque Ports |
| Cinsault | Cinsaut |
| Cintiakaktus | Cintia |
| CIO | Chief information officer |
| CipSoft GmbH | CipSoft GmbH |
| Circle Of Dead Children | Circle of Dead Children |
| Circuit Bugatti du Mans | Bugatti Circuit |
| Circuit de Catalunya | Circuit de Catalunya |
| Circuit de Charade | Charade Circuit |
| Circuit de Dijon-Prenois | Dijon-Prenois |
| Circuit de la Comunitat Valenciana Ricardo Tormo | Circuit de Valencia |
| Circuit de Nevers Magny-Cours | Circuit de Nevers Magny-Cours |
| Circuit de Reims-Gueux | Reims-Gueux |
| Circuit de Rouen-les-Essarts | Rouen-Les-Essarts |
| Circuit Mont-Tremblant | Circuit Mont-Tremblant |
| Circuit Park Zandvoort | Circuit Park Zandvoort |
| Circuit Paul Ricard | Circuit Paul Ricard |
| Circuit Zolder | Zolder |
| Circuito da Boavista | Circuito da Boavista |
| Circuito de Montjuich | Montjuïc circuit |
| Circuito de Pedralbes | Pedralbes Circuit |
| Circuito del Jarama | Circuito Permanente Del Jarama |
| Circuito do Estoril | Autódromo do Estoril |
| Circuito Permanente de Jerez | Circuito Permanente de Jerez |
| Circuito Santamonica | Misano World Circuit |
| Circus Maximus | Circus Maximus |
| Cire perdue | Lost-wax casting |
| cirka | about |
| cirkel | circle |
| cirkelargument | circular argument |
| cirkelbevis | circular argument |
| cirkelbåge | arc |
| cirkeldefinition | circular definition |
| Cirkelmodellen | Concentric ring model |
| Cirkelns kvadratur | Quadrature of the circle |
| Cirkelpassaren | Circinus |
| cirkelrund | circular |
| cirkelsektor | circular arc |
