| Comecon | Rada Wzajemnej Pomocy Gospodarczej |
| Comedy Central | Comedy Central Polska |
| Comet | Comet |
| Comic Relief | Comic Relief |
| Comilla | Kumilla |
| Comino | Comino |
| Comitia | Concilium plebis |
| Comitium | Comitium |
| Comma-separated value | CSV |
| Commander in Chief | Pani Prezydent |
| Commander Keen | Commander Keen |
| Commando | Wzorzec polecenia |
| Commedia dell'arte | Commedia dell'arte |
| Commelinales | Komelinowce |
| Commerzbank Tower | Commerzbank Tower |
| Commerzbank-Arena | Commerzbank-Arena |
| Commodore | Commodore International |
| Commodore PET | Commodore PET |
| Commodus | Kommodus |
| Common Agricultural Policy | Wspólna polityka rolna Unii Europejskiej |
| Common Desktop Environment | Common Desktop Environment |
| Common Gateway Interface | CGI |
| Common law | Common law |
| Commugny | Commugny |
| Communist Party of India | Komunistyczna Partia Indii |
| Community | Społeczność internetowa |
| Community Shield | Tarcza Wspólnoty |
| Como | Como |
| Comorerna | Komory |
| comorisk | komoryjski |
| Comosjön | Jezioro Como |
| Comoé nationalpark | Park Narodowy Komoé |
| CompactFlash | CompactFlash |
| Compiègne | Compiègne |
| Complete Studio Recordings | The Complete Studio Recordings |
| Completorium | Kompleta |
| Complex programmable logic device | CPLD |
| Compomarino | Campomarino |
| Component Object Model | Component Object Model |
| Compsognathider | Kompsognaty |
| Compton | Compton |
| Comptonspridning | Zjawisko Comptona |
| Computerwelt | Computerwelt |
| Comrat | Komrat |
| Comte de Lautréamont | Comte de Lautréamont |
| Comté | Shire |
| Comédie-Française | Comédie-Française |
| Conakry | Konakry |
| Conan | Conan Barbarzyńca |
| Conan Barbaren | Conan Barbarzyńca |
| Conan förgöraren | Conan Niszczyciel |
| Conax | Conax |
| CONCACAF | CONCACAF |
| CONCACAF Gold Cup | Złoty Puchar CONCACAF |
| Concepción | Concepción |
| concertina | koncertyna |
| Concerto grosso | Concerto grosso |
| Conchita Martínez | Conchita Martínez |
| Conchning | Konsza |
| Conchobar | Conchobar |
| Conciergerie | Conciergerie |
| Concise | Concise |
| Concord | Concord |
| Concorde | Concorde |
| Concordia | Concordia |
| Concordiatemplet | Świątynia Zgody w Rzymie |
| Concurrent Versions System | CVS |
| Condoleezza Rice | Condoleezza Rice |
| Condor | Condor Airlines |
| Confederations Cup | Puchar Konfederacji w piłce nożnej |
| Confessions of a Dangerous Mind | Niebezpieczny umysł |
| Confignon | Confignon |
| Conflans-Sainte-Honorine | Conflans-Sainte-Honorine |
| Confédération Générale du Travail | Powszechna Konfederacja Pracy |
| Congo | Kongo |
| Congonhas | Congonhas |
| CONMEBOL | CONMEBOL |
| Conn Smythe Trophy | Conn Smythe Trophy |
| Connacht | Connacht |
| Connecticut | Connecticut |
| Connecticutfloden | Connecticut |
| Connecticuts flagga | Flaga stanowa Connecticut |
| Connor Trinneer | Connor Trinneer |
| Conns sjukdom | Zespół Conna |
| Connétable | Konetablowie Francji |
| Conquer | Conquer Online |
| Conquistador | Konkwista |
| Conrad | Konrad |
| Conrad Aiken | Conrad Aiken |
| Conrad Burns | Conrad Burns |
| Conrad Gesner | Konrad Gesner |
| consensus | konsensus |
| Constans | Konstans |
| Constantin | Konstantyn |
| Constantin Brancusi | Constantin Brâncuşi |
| Constantine | Constantine |
| Constantinus | Papież Konstantyn |
| Constantius I Chlorus | Konstancjusz I Chlorus |
| Constantius II | Konstancjusz II |
| Constantius III | Konstancjusz III |
| Constanţa | Konstanca |
| Constellationprogrammet | Program Constellation |
| Constitution Party | Partia Konstytucyjna |
| container | kontener |
| Content Scrambling System | Content Scramble System |
| Conters im Prättigau | Conters im Prättigau |
| Contessa Entellina | Contessa Entellina |
| Conthey | Conthey |
| Continental | Wesoła rozwódka |
| Contone | Contone |
| Contortatall | Sosna wydmowa |
| Contras | Contras |
| Control | Control |
| Controller Area Network | Controller Area Network |
| Converge | Converge |
| Conwy | Conwy |
| Cook County | Hrabstwo Cook |
| cookie | ciasteczko |
| Cookies | Ciasteczka |
| Cooksundet | Cieśnina Cooka |
| Cooktown | Cooktown |
| Cooköarna | Wyspy Cooka |
| Cooköarnas flagga | Flaga Wysp Cooka |
| Cooköarnas fotbollslandslag | Reprezentacja Wysp Cooka w piłce nożnej |
| cool | fajny |
| Cool jazz | Cool jazz |
| Cool World | Zimny swiat |
| Coolio | Coolio |
| Cooper | Cooper |
| Coopers test | Test Coopera |
| Coos County | Hrabstwo Coos |
| Copa América | Copa América |
| Copa del Rey | Puchar Króla |
| Copa do Brasil | Copa do Brasil |
| Copa Libertadores de América | Copa Libertadores w piłce nożnej |
| Copa Sudamericana | Copa Sudamericana |
| Copacabana | Copacabana |
| copernicium | copernicium |
| Copernicus | Kopernik |
| Coppa Italia i fotboll | Puchar Włoch w piłce nożnej |
| Coppa Italia і fotboll | Puchar Włoch w piłce nożnej |
| Coppet | Coppet |
| Copycat brott | Copycat przestępstwo |
| Copyleft | Copyleft |
| copyright | prawo autorskie |
| Copán | Copán |
| Coquimbo Unido | Coquimbo Unido |
| Coracobrachialis | Mięsień kruczo-ramienny |
| Coral Buttsworth | Coral Buttsworth |
| Coraline | Koralina |
| Corazon Aquino | Corazon Aquino |
| CORBA | CORBA |
| Corbeil-Essonnes | Corbeil-Essonnes |
| Corbeyrier | Corbeyrier |
| Corbières | Corbières |
| Corcelles-le-Jorat | Corcelles-le-Jorat |
| Corcelles-près-Consice | Corcelles-près-Consice |
| Corcelles-près-Payerne | Corcelles-près-Payerne |
| Corcelles-sur-Chavornay | Corcelles-sur-Chavornay |
| Corcovado | Pomnik Chrystusa Zbawiciela w Rio de Janeiro |
| Cordelia | Kordelia |
| Cordelia Chase | Cordelia Chase |
| Cordelierklubben | Kordelierzy |
| Cordell Hull | Cordell Hull |
| cordierit | kordieryt |
| Cordis | CORDIS |
| Cordoba | Córdoba |
| Corel | Corel Corporation |
| Corel Photo-Paint | Corel PHOTO-PAINT |
| CorelDRAW | CorelDRAW |
| Coremedia | Coremedia |
| Coreper | Komitet Stałych Przedstawicieli |
| Coretta Scott King | Coretta Scott King |
| Corey Taylor | Corey Taylor |
| Coricancha | Coricancha |
| Corina Morariu | Corina Morariu |
| Corinne Rey-Bellet | Corinne Rey-Bellet |
| Corinthians Alagoano | Corinthians Alagoano Maceió |
| Coriolanus | Koriolan |
| Corioliseffekten | Efekt Coriolisa |
| Corippo | Corippo |
| Cork | Cork |
| Corleone | Corleone |
| Cormac | Cormac |
| Corminboeuf | Corminboeuf |
| Corneille Heymans | Corneille Heymans |
| Cornelia | Kornelia |
| Cornelia Funke | Cornelia Funke |
| Cornelis | Korneliusz |
| Corneliu Codreanu | Corneliu Zelea Codreanu |
| Cornelius | Korneliusz |
| Cornelius Fudge | Korneliusz Knot |
| Cornelius Jansen | Cornelius Jansen |
| Cornelius Knös | Korneliusz Kwaczak |
| Cornelius Nepos | Korneliusz Nepos |
| Cornelius Ryan | Cornelius Ryan |
| Cornell Capa | Cornell Capa |
| Cornell University | Uniwersytet Cornella |
| Cornish rex | Kot cornish rex |
| Cornwall | Kornwalia |
| Coro | Coro |
| Corot | Corot |
| Corpataux-Magnedens | Corpataux-Magnedens |
| Corporación Deportiva Everton de Viña del Mar | Everton Viña del Mar |
| Corporate finance | Finanse przedsiębiorstwa |
| Corps de ballet | Corps de ballet |
| Corpse Bride | Gnijąca panna młoda |
| Corpus Christi | Uroczystość Ciała i Krwi Pańskiej |
| Corpus juris civilis | Kodeks Justyniana |
| Correggio | Antonio Allegri da Correggio |
| Corregidor | Corregidor |
| Correvon | Correvon |
| Corriere della Sera | Corriere della Sera |
| Corrèze | Corrèze |
| Corsairfly | Corsairfly |
| Corse-du-Sud | Corse-du-Sud |
| Corserey | Corserey |
| Corsier | Corsier |
| Corsier-sur-Vevey | Corsier-sur-Vevey |
| Cortes Generales | Kortezy |
| Corticiasca | Corticiasca |
| Cortland County | Hrabstwo Cortland |
| Corto Maltese | Corto Maltese |
| Cortona | Cortona |
| Coruscant | Coruscant |
| Corvo | Kruk |
| Cory i Vita Huset | Cory w Białym Domu |
| Cosby | The Cosby Show |
| Cosenza | Prowincja Cosenza |
| Cosima Wagner | Cosima Wagner |
| Cosimo den store | Cosimo Medici |
| Cosimo den äldre | Cosimo Medici |
| cosinus | cosinus |
| Cosinussatsen | Twierdzenie cosinusów |
| Cossonay | Cossonay |
| Costa blanca | Costa Blanca |
| Costa Brava | Costa Brava |
| Costa del Azahar | Costa del Azahar |
| Costa del Sol | Costa del Sol |
| Costa Rica | Kostaryka |
| Costa Ricas flagga | Flaga Kostaryki |
| Costa Ricas fotbollslandslag | Reprezentacja Kostaryki w piłce nożnej |
