| ciężarek | counterweight |
| ciężarna | pregnant |
| ciężarny | pregnant |
| Ciężarów podnoszenie | Weightlifting |
| ciężarówka | truck |
| Ciężka woda | Heavy water |
| ciężki | arduous |
| Ciężki karabin maszynowy | Heavy machine gun |
| ciężkie przestępstwo | felony |
| ciężko | hard |
| Ciężkowice | Ciężkowice |
| ciśnienie | pressure |
| Ciśnienie atmosferyczne | Atmospheric pressure |
| Ciśnienie dynamiczne | Dynamic pressure |
| Ciśnienie hydrostatyczne | Fluid pressure |
| ciśnienie krwi | blood pressure |
| ciśnienie pary | vapour pressure |
| Ciśnienie statyczne | Static pressure |
| Ciśnienie tętna | Pulse pressure |
| Ciśnienie tętnicze | Blood pressure |
| ciżba | squeeze |
| CJK | WTF |
| Ckliwica | Urginea maritima |
| ckm | MG |
| CKY | CKY |
| Clackmannanshire | Clackmannanshire |
| Claddagh ring | Claddagh ring |
| Claira | Claira |
| Claire Chennault | Claire Lee Chennault |
| Claire Danes | Claire Danes |
| Claire Forlani | Claire Forlani |
| Claire Littleton | Claire Littleton |
| Clairmarais | Clairmarais |
| Clamart | Clamart |
| ClamAV | Clam AntiVirus |
| CLAMP no Kiseki | Clamp no Kiseki |
| CLAMP School Detectives | Clamp School Detectives |
| ClamWin | ClamWin |
| Clan of Xymox | Clan of Xymox |
| ClanLib Game SDK | ClanLib |
| Clara Barton | Clara Barton |
| Clara Bow | Clara Bow |
| Clara Rockmore | Clara Rockmore |
| Clare | Clare |
| Clarence Darrow | Clarence Darrow |
| Clarence Seedorf | Clarence Seedorf |
| Clarence Zener | Clarence Zener |
| Clarisa Fernández | Clarisa Fernandez |
| Clark Gable | Clark Gable |
| Clarmont | Clarmont |
| Clarques | Clarques |
| Clas-Brede Bråthen | Clas Brede Bråthen |
| Class | Class |
| Classless Inter-Domain Routing | Classless Inter-Domain Routing |
| Claude Adrien Helvétius | Claude Adrien Helvétius |
| Claude Bernard | Claude Bernard |
| Claude Chappe | Claude Chappe |
| Claude Cohen-Tannoudji | Claude Cohen-Tannoudji |
| Claude de Villars | Claude Louis Hector de Villars |
| Claude Debussy | Claude Debussy |
| Claude E. Shannon | Claude Shannon |
| Claude Jade | Claude Jade |
| Claude Joseph Rouget de Lisle | Claude Joseph Rouget de Lisle |
| Claude Le Roy | Claude Le Roy |
| Claude Lelouch | Claude Lelouch |
| Claude Lorrain | Claude Lorrain |
| Claude Louis Berthollet | Claude Louis Berthollet |
| Claude Lévi-Strauss | Claude Lévi-Strauss |
| Claude Makélélé | Claude Makélélé |
| Claude Mellan | Claude Mellan |
| Claude Monet | Claude Monet |
| Claude Nicolas Ledoux | Claude Nicolas Ledoux |
| Claude Simon | Claude Simon |
| Claude Speed | Claude |
| Claude Vorilhon | Raël |
| Claudette Colbert | Claudette Colbert |
| Claudia Cardinale | Claudia Cardinale |
| Claudia Schiffer | Claudia Schiffer |
| Claudio Abbado | Claudio Abbado |
| Claudio Caniggia | Claudio Caniggia |
| Claudio Fava | Claudio Fava |
| Claudio Gentile | Claudio Gentile |
| Claudio López | Claudio López |
| Claudio Magris | Claudio Magris |
| Claudio Monteverdi | Claudio Monteverdi |
| Claudio Reyna | Claudio Reyna |
| Claudius Aelianus | Claudius Aelianus |
| Claus | Claus von Amsberg |
| Claus von Stauffenberg | Claus Schenk Graf von Stauffenberg |
| Claustrum | Monastery |
| Claviere | Claviere |
| Clay Bailey | Clay Bailey |
| Clay Regazzoni | Clay Regazzoni |
| Clayes-sous-Bois | Les Clayes-sous-Bois |
| Clayton Anderson | Clayton Anderson |
| Cleanroom | Cleanroom Software Engineering |
| ClearType | ClearType |
| Cleebronn | Cleebronn |
| Clemens Brentano | Clemens Brentano |
| Clemens Peter Freiherr von Pirquet | Clemens von Pirquet |
| Clement | Clement |
| Clement Arrindell | Clement Arrindell |
| Clement Dodd | Coxsone Dodd |
| Clement Richard Attlee | Clement Attlee |
| Clemente Domínguez y Gómez | Clemente Domínguez y Gómez |
| Clenleu | Clenleu |
| Cleon II | Cleon II |
| Clermont Foot | Clermont Foot |
| Clermont-Ferrand | Clermont-Ferrand |
| Clervaux | Clervaux |
| Cleveland | Cleveland |
| Cleveland Bay | Cleveland Bay |
| Cleveland Browns | Cleveland Browns |
| Cleveland Cavaliers | Cleveland Cavaliers |
| Cleveland Indians | Cleveland Indians |
| Clichy-sous-Bois | Clichy-sous-Bois |
| Cliff Burton | Cliff Burton |
| Cliff Richard | Cliff Richard |
| Clifford Geertz | Clifford Geertz |
| Clifford Husbands | Clifford Husbands |
| Clifford Olson | Clifford Olson |
| Clifford Shull | Clifford Shull |
| Clifton Suspension Bridge | Clifton Suspension Bridge |
| Clingen | Clingen |
| Clint Eastwood | Clint Eastwood |
| Clinton | Clinton |
| Clinton Joseph Davisson | Clinton Davisson |
| Clinton Woods | Clinton Woods |
| Clio | Clio |
| Clipperton | Clipperton Island |
| CLIST | CLIST |
| Clitoris | Clitoris |
| Clive Barker | Clive Barker |
| Clive Burr | Clive Burr |
| Clive Granger | Clive Granger |
| Clive Owen | Clive Owen |
| Clive Sinclair | Clive Sinclair |
| Clive Staples Lewis | C. S. Lewis |
| Cloaca Maxima | Cloaca Maxima |
| Clodoaldo | Clodoaldo |
| Cloisonné | Cloisonné |
| Clonmacnoise | Clonmacnoise |
| Clonmel | Clonmel |
| Clonorchis sinensis | Clonorchis sinensis |
| Cloppenburg | Cloppenburg |
| Clos Lucé | Clos Lucé |
| Cloud Strife | Cloud Strife |
| Cloudsat | CloudSat |
| Clover | Clover |
| Clovis | Clovis |
| Clovis Dardentor | Clovis Dardentor |
| Club Atlético Boca Juniors | Club Atlético Boca Juniors |
| Club Atlético Lanús | Club Atlético Lanús |
| Club Atlético River Plate | Club Atlético River Plate |
| Club Atlético Rosario Central | Rosario Central |
| Club Atlético Talleres | Club Atlético Talleres de Remedios de Escalada |
| Club Deportivo Universidad Católica | Club Deportivo Universidad Católica |
| Club Jenna | ClubJenna |
| Club Jorge Wilstermann | Club Jorge Wilstermann |
| Club León | Club León |
| Club Nacional de Football | Club Nacional de Football |
| Clugin | Clugin |
| Cluny | Cluny |
| Clusaz | La Clusaz |
| Cluses | Cluses |
| Clusone | Clusone |
| Cluster | Cluster mission |
| Clutha | Clutha River |
| CLX | Component Library for Cross Platform |
| Clyde | River Clyde |
| Clyde Tombaugh | Clyde Tombaugh |
| Clydesdale | Clydesdale |
| Clásica de San Sebastián | Clásica de San Sebastián |
| Cláudio Hummes | Cláudio Hummes |
| Cláudio Taffarel | Cláudio Taffarel |
| Clémence Poésy | Clémence Poésy |
| Clément Janequin | Clément Janequin |
| Clément Marot | Clément Marot |
| Cléty | Cléty |
| CMAS | Confédération Mondiale des Activités Subaquatiques |
| cmentarny | cemetery |
| cmentarz | cemetery |
| Cmentarz Bernardyński na Zarzeczu | Bernardine Cemetery |
| Cmentarz Centralny w Wiedniu | Zentralfriedhof |
| Cmentarz dla zwierząt | Pet cemetery |
| Cmentarz La Chacarita | La Chacarita Cemetery |
| Cmentarz Montmartre | Montmartre Cemetery |
| Cmentarz Montparnasse | Montparnasse Cemetery |
| Cmentarz na Rossie | Rasos Cemetery |
| Cmentarz Nowodziewiczy | Novodevichy Cemetery |
| Cmentarz Orląt | Cemetery of the Defenders of Lwów |
| Cmentarz Passy | Passy Cemetery |
| Cmentarz Piskariowski w Sankt Petersburgu | Piskaryovskoye Memorial Cemetery |
| Cmentarz Powązkowski | Powązki Cemetery |
| Cmentarz Père-Lachaise | Père Lachaise Cemetery |
| Cmentarz Rakowicki | Rakowicki Cemetery |
| Cmentarz Wagańkowski | Vagankovo Cemetery |
| Cmentarz Łyczakowski we Lwowie | Lychakivskiy Cemetery |
| Cmentarz żydowski w Berlinie-Weißensee | Weißensee Cemetery |
| Cmentarz żydowski w Warszawie | Okopowa Street Jewish Cemetery |
| cmentarzysko | cemetery |
| CML | Chemical Markup Language |
| CMM | Capability Maturity Model |
| CMMS | Computerized Maintenance Management System |
| cmokier | sycophant |
| CMOS | CMOS |
| CMS | Compact Muon Solenoid |
| CMYK | CMYK color model |
| CN Tower | CN Tower |
| Cna | Tsna |
| CNC | CNC |
| CNG | Compressed natural gas |
| CNN | CNN |
| cnota | chastity |
