| cnoty kardynalne | cardinal virtues |
| co | that |
| co ci chodzi po głowie | what's on your mind |
| co do joty | to a T |
| co dwie głowy, to nie jedna | two heads are better than one |
| co jest kurwa_ | what the fuck |
| co ma piernik do wiatraka | what does that have to do with the price of tea in China |
| co nagle, to po diable | haste makes waste |
| co najmniej | at least |
| co oznacza XX_ | what does XX mean |
| co Pan robi_ | what are you doing |
| co Pani robi_ | what are you doing |
| co robisz_ | what are you doing |
| Co się wydarzyło w Madison County | The Bridges of Madison County |
| co słychać_ | how are you |
| co to jest_ | what is that |
| co tydzień | weekly |
| co z siebie dajesz, to do ciebie wraca | what goes around comes around |
| co! | what |
| Coahuila | Coahuila |
| Coatlicue | Coatlicue |
| COBE | Cosmic Background Explorer |
| COBOL | COBOL |
| Cobreloa Calama | Cobreloa |
| Cobresal El Salvador | Club Deportes Cobresal |
| Coburg | Coburg |
| Coca-Cola | Coca-Cola |
| Coca-Cola Light | Diet Coke |
| Cochabamba | Cochabamba Department |
| Coche | Coche |
| Cocherel | Cocherel |
| Cochrane Collaboration | Cochrane Library |
| Cock sparrer | Cock Sparrer |
| Cockburn Town | Cockburn Town |
| Cocker spaniel angielski | English Cocker Spaniel |
| Cockney | Cockney |
| Cocktail | Cocktail |
| Coco | Coco River |
| Coco Chanel | Coco Chanel |
| COCOM | CoCom |
| COCOMO | COCOMO |
| CODAD | Combined diesel and diesel |
| CODAG | Combined diesel and gas |
| CODATA | Committee on Data for Science and Technology |
| Code Igniter | CodeIgniter |
| Code of Points | ISU Judging System |
| Code Red | Code Red |
| Codex Alimentarius | Codex Alimentarius |
| Codex Maximilianeus Bavaricus Civilis | Codex Maximilianeus bavaricus civilis |
| Codex Regius | Codex Regius |
| CODLAG | Combined diesel-electric and gas |
| Codlea | Codlea |
| CODOG | Combined diesel or gas |
| Codogno | Codogno |
| codziennie | daily |
| codzienny | everyday |
| Coefficient Of Performance | Coefficient of performance |
| Coemptio | Manus marriage |
| Coenraad Jacob Temminck | Coenraad Jacob Temminck |
| cofać | withdraw |
| Coffinit | Coffinite |
| Cofidis | Cofidis |
| cofnąć | rescind |
| COGAG | Combined gas and gas |
| Cogito ergo sum | Cogito ergo sum |
| Cognac | Cognac |
| COGOG | Combined gas or gas |
| Cohen | Kohen |
| Coihue | Nothofagus dombeyi |
| Coimbatore | Coimbatore |
| Coimbra | Coimbra |
| Coinsins | Coinsins |
| Cojedes | Cojedes |
| cokolik | baseboard |
| cokolwiek | anything |
| cokół | base |
| Col du Mont-Cenis | Mont Cenis |
| Cola | Cola |
| Cola di Rienzi | Cola di Rienzo |
| Colargol | Barnaby |
| Colbert | Colbert |
| Colca | Colca Canyon |
| Colchester | Colchester |
| Cold Day in the Sun | Cold Day in the Sun |
| Cold fear | Cold fear |
| CoLD SToRAGE | Tim Wright |
| Cold wave | Coldwave |
| ColdFusion | ColdFusion |
| Colditz | Colditz |
| Coldplay | Coldplay |
| Coldrerio | Coldrerio |
| Cole Porter | Cole Porter |
| Cole Turner | Cole Turner |
| ColecoVision | ColecoVision |
| Coleman Hawkins | Coleman Hawkins |
| Colemanit | Colemanite |
| Colembert | Colembert |
| coleslaw | coleslaw |
| colesław | coleslaw |
| Colico | Colico |
| Colima | Colima |
| Colin Farrell | Colin Farrell |
| Colin Firth | Colin Firth |
| Colin Maclaurin | Colin Maclaurin |
| Colin McRae | Colin McRae |
| Colin McRae Rally | Colin McRae Rally |
| Colin Powell | Colin Powell |
| College | College |
| College football | College football |
| College rock | College rock |
| Collenberg | Collenberg |
| Collet-de-Dèze | Le Collet-de-Dèze |
| Colleville-Montgomery | Colleville-Montgomery |
| Collex-Bossy | Collex-Bossy |
| Colline-Beaumont | Colline-Beaumont |
| Collins | Collins |
| Collioure | Collioure |
| Collombey-Muraz | Collombey-Muraz |
| Collonge-Bellerive | Collonge-Bellerive |
| Collège de France | Collège de France |
| Collégien | Collégien |
| Colm Meaney | Colm Meaney |
| Colmar | Colmar |
| Colmberg | Colmberg |
| Colo Colo Santiago | Colo-Colo |
| Coloboma | Coloboma |
| Cologny | Cologny |
| Colombes | Colombes |
| Colombey-les-Deux-Eglises | Colombey-les-Deux-Églises |
| Colombiers-sur-Seulles | Colombiers-sur-Seulles |
| Colomesus | Colomesus |
| Colomiers | Colomiers |
| Colon | Colonel |
| Colonia | Colonia Department |
| Colonia del Sacramento | Colonia del Sacramento |
| Colonia Dignidad | Colonia Dignidad |
| Colonia Güell | Church of Colònia Güell |
| Colonia Juan Lacaze | Deportivo Colonia |
| Colonia Tovar | Colonia Tovar |
| Colonial Cup | International Hockey League |
| Colony | Colony |
| Colony Collapse Disorder | Colony Collapse Disorder |
| Color field painting | Color Field |
| Color Graphics Adapter | Color Graphics Adapter |
| Color Line Arena | Color Line Arena |
| Colorado | Colorado River |
| Colorado Avalanche | Colorado Avalanche |
| Colorado Rapids | Colorado Rapids |
| Colorado Rockies | Colorado Rockies |
| Colossus | Colossus computer |
| Coluche | Coluche |
| Columbia | Columbia |
| Columbia Broadcasting System | CBS |
| Columbia Center | Columbia Center |
| Columbia Records | Columbia Records |
| Columbus | Columbus |
| Columbus Blue Jackets | Columbus Blue Jackets |
| Columbus Crew | Columbus Crew |
| Colville Young | Colville Young |
| Colón Santa Fe | Colón de Santa Fe |
| COM | Com |
| Comair | Comair |
| Comandante Ferraz | Comandante Ferraz Brazilian Antarctic Base |
| Comano | Comano |
| Comarca | Comarca |
| ComArch | ComArch |
| Comayagua | Comayagua |
| comber | saddle |
| Comberanche-et-Épeluche | Comberanche-et-Épeluche |
| Combi Coupé | Combi coupé |
| Combino Plus | Combino Supra |
| Combremont-le-Grand | Combremont-le-Grand |
| Combremont-le-Petit | Combremont-le-Petit |
| Combs-la-Ville | Combs-la-Ville |
| Come as You Are | Come as You Are |
| Come with Us | Come with Us |
| Comedian Harmonists | Comedian Harmonists |
| Comedy Central Polska | Comedy Central |
| Comet | Comet tank |
| Comines | Comines |
| Comino | Comino |
| Cominotto | Cominotto |
| Comitium | Comitium |
| Comma Johanneum | Comma Johanneum |
| Commander Keen | Commander Keen series |
| Commedia dell'arte | Commedia dell'arte |
| Commercial papers | Treasury note |
| Commercy | Commercy |
| Commerzbank Tower | Commerzbank Tower |
| Commerzbank-Arena | Commerzbank-Arena |
| Committed Information Rate | Committed Information Rate |
| Commodore CBM-II | Commodore CBM-II |
| Commodore International | Commodore International |
| Commodore PET | Commodore PET |
| Common Desktop Environment | Common Desktop Environment |
| Common Development and Distribution License | Common Development and Distribution License |
| Common Hardware Reference Platform | Common Hardware Reference Platform |
| Common Intermediate Language | Common Intermediate Language |
| Common Language Runtime | Common Language Runtime |
| Common Public License | Common Public License |
| Common Scrambling Algorithm | Common Scrambling Algorithm |
| Common UNIX Printing System | Common Unix Printing System |
| Commons | Wikimedia Commons |
| Commonwealth Bank Tennis Classic | Wismilak International |
| Commonwealth realm | Commonwealth realm |
| Commugny | Commugny |
| Como | Como |
| Comodoro Rivadavia | Comodoro Rivadavia |
| CompactFlash | CompactFlash |
| Compitalia | Compitalia |
| Compiègne | Compiègne |
| Complete Studio Recordings | The Complete Studio Recordings |
| Component Object Model | Component Object Model |
| Comprachicos | Comprachicos |
| Comptonia | Comptonia |
| Computer Aided Engineering | Computer-aided engineering |
| Computer Algebra System | Computer algebra system |
| Computer Entertainment Rating Organization | Computer Entertainment Rating Organization |
| Computer History Museum | Computer History Museum |
| Computerwelt | Computer World |
| Comte de Lautréamont | Comte de Lautréamont |
| Comunicaciones Buenos Aires | Club Comunicaciones |
| Comunicaciones Gwatemala | Comunicaciones |
