| Ciliater | Ciliophora |
| Cilice | Cilice |
| Cimabue | Cimabue |
| Cimadera | Cimadera |
| Cincinnati | Cincinnati |
| Cincinnati Bengals | Cincinnati Bengals |
| Cincinnati Reds | Cincinnati Reds |
| Cincinnatus | Lucius Quinctius Cincinnatus |
| Cinderella Man | Cinderella Man |
| Cindy Crawford | Cindy Crawford |
| Cinemascope | Cinemascope |
| Cinematograf | Cinématographe |
| Cinerama | Cinerama |
| Cinna | Lucius Cornelius Cinna |
| Cinsault | Cinsaut |
| Cipramil | Citalopram |
| Circuit Bugatti du Mans | Bugatti |
| Circuit de Catalunya | Circuit de Catalunya |
| Circuit de Charade | Clermont-Ferrand |
| Circuit de Dijon-Prenois | Dijon-Prenois |
| Circuit de Nevers Magny-Cours | Circuit Magny-Cours |
| Circuit de Rouen-les-Essarts | Rouen-Les-Essarts |
| Circuit Mont-Tremblant | Mont-Tremblant |
| Circuit Park Zandvoort | Circuit Park Zandvoort |
| Circuit Paul Ricard | Circuit Paul Ricard |
| Circuit Zolder | Circuit Zolder |
| Circuito da Boavista | Boa Vista |
| Circuito de Montjuich | Montjuïc |
| Circuito do Estoril | Autódromo do Estoril |
| Circuito Santamonica | Misano Circuit |
| Circular Quay | Circular Quay |
| Circus Maximus | Circus Maximus |
| Cire perdue | Cire perdue |
| cirka | ongeveer |
| cirkel | kring |
| cirkelargument | cirkelredenering |
| cirkelbevis | cirkelredenering |
| Cirkelevolvent | Evolvente |
| cirkelformad | rond |
| cirkelrund | rond |
| cirkelskiva | cirkel |
| cirkelsåg | cirkelzaag |
| cirkla | ronddraaien |
| cirkulations- | circulerend |
| Cirkulationsandning | Circulaire ademhaling |
| cirkulera | de ronde doen |
| cirkulär | rond |
| cirkumfix | circumfuse |
| Cirrocumulus | Cirrocumulus |
| Cirrostratus | Cirrostratus |
| cirrusmoln | cirrus |
| Cisalpina Gallien | Gallia Cisalpina |
| Cisalpinska republiken | Cisalpijnse Republiek |
| CISC | Complex Instruction Set Computer |
| Cisco Systems | Cisco Systems |
| Cispadanska republiken | Cispadaanse Republiek |
| Cisterciensorden | Cisterciënzers |
| citadell | fort |
