| Cabbage Soft | Japan | — | 4 | 3 |
| Caipirinha Games | Germany | — | 2 | — |
| California Pacific Computer Company | United States | 1979 | — | 2 |
| Camelot Software Planning | Japan | April 4, 1994 | 27 | 1 |
| Camerica | Canada | 1988 | — | — |
| Camouflaj | United States | — | 1 | — |
| Campo Santo | — | September 18, 2013 | 1 | — |
| Canal+ | France | November 4, 1984 | 1 | 1 |
| Canal+ Multimedia | France | 1995 | — | 1 |
| Canalside Studios | United Kingdom | — | 2 | 2 |
| Canari Games | Canada | 2018 | 1 | — |
| Candy Soft | Japan | — | 4 | 2 |
| Candygun Games UG | Germany | 2009 | 1 | — |
| Canuck Play | Canada | — | 1 | — |
| Capcom | Japan | May 30, 1979 | 230 | 261 |
| Capcom Production Studio 4 | Japan | 1999 | 1 | — |
| Capcom Vancouver | Canada | 2005 | 4 | — |
| Capricia Productions | Israel | 2013 | 1 | — |
| Capstone Software | United States | 1984 | 4 | 1 |
| Captain Games | Canada | — | 1 | 1 |
| Capybara Games | Canada | 2003 | 2 | 1 |
| Caramel Box | Japan | — | 4 | 4 |
| Carbonated Games | United States | 2004 | 1 | — |
| Career Soft | Japan | June 1996 | 13 | — |
| CarloC | Italy | May 31, 2019 | 1 | — |
| Carry Lab | Japan | 1981 | 2 | — |
| Cartoon Network | United States | October 1992 | 2 | 2 |
| Cartoon Network Studios | United States | 1994 | — | 1 |
| CarX Technologies | Russia | 2016 | 4 | 4 |
| Cassel Games | South Korea | — | 1 | 1 |
| Casus Ludi | France | June 2014 | 1 | — |
| Cat Daddy Games | United States | 1996 | 10 | — |
| Catear | Japan | — | 2 | 2 |
| Cattle Call | Japan | March 20, 1998 | 5 | — |
| Cauldron | Slovakia | 1996 | 5 | — |
| Causa Creations | — | 2014 | 1 | 1 |
| CAVE | Japan | June 15, 1994 | 18 | 6 |
| Cave Monsters | United Kingdom | November 5, 2018 | 1 | 1 |
| Cavedog Entertainment | United States | 1996 | 4 | — |
| Cavia | Japan | March 2000 | 15 | — |
| Cavyhouse | Japan | — | 3 | — |
| CBE Software | Czech Republic | 2006 | 2 | — |
| CCCP Games | Russia | 2004 | 1 | — |
| CD Bros. | Japan | 1994 | — | 1 |
| CD Projekt | Poland | May 1994 | 1 | 5 |
| CD Projekt RED | Poland | February 2002 | 14 | 6 |
| Cdp.pl | Poland | 2012 | — | 4 |
| Cdv Software Entertainment | Germany | 1989 | 5 | 18 |
| CE-Asia | People's Republic of China | 1999 | — | 1 |
| CEA Saclay | France | — | 1 | — |
| Celeris | United States | 1987 | 2 | — |
| Cellius | Japan | 2007 | 1 | — |
| Cenega | Poland | — | — | 2 |
| Centauri Production | Czech Republic | 2000 | 1 | — |
| Century Games | Singapore | — | 1 | 1 |
| CFK | South Korea | — | 4 | 10 |
| CGA Studio Games | United Kingdom | November 2, 2021 | 1 | — |
| CGE Digital | Czech Republic | August 5, 2015 | 1 | 1 |
| CGMatic | Thailand | 2010 | 1 | — |
| Chair Entertainment | United States | 2005 | 3 | — |
| Changyou | People's Republic of China | 2007 | — | 1 |
| Chaos Group Games | Poland | 2016 | 1 | 1 |
| Chaosmonger Studio | Estonia | — | 2 | 1 |
| Chasing Rats Games | — | 2018 | 1 | — |
| Cheetah Mobile | — | 2009 | 7 | 7 |
| Chengdu Nekoday Network Technology Co., Ltd. | People's Republic of China | August 7, 2018 | 1 | 1 |
| ChessBase | Germany | 1985 | — | — |
| Chibig | Spain | 2017 | 4 | 4 |
| Chihuas Games | Mexico | — | 1 | 1 |
| ChiliDog Interactive | Russia | — | — | 25 |
| Chilla's Art | Japan | — | 16 | 16 |
| Chillingo | United Kingdom | 2002 | — | 3 |
| Chimera Entertainment | Germany | 2006 | 3 | — |
| Chiyomaru Studio | Japan | — | 2 | — |
| Choice of Games | United States | 2009 | 146 | 146 |
| Choice Provisions | United States | 2007 | 8 | 1 |
| Chorus Worldwide | Japan | — | — | 9 |
| Chromatic Games | United States | December 14, 2009 | 4 | 4 |
| Chronic Logic | United States | 2001 | 1 | 1 |
| Chubby Pixel | Italy | 2012 | 2 | — |
| Chucklefish | — | — | 1 | 5 |
| Chunkybox Games | Australia | — | 1 | — |
| Chunsoft | Japan | 1984 | 25 | 5 |
| CI Games S.A. | Poland | 2002 | 10 | 15 |
| Cinemassacre Productions | United States | 2004 | — | 3 |
| Cinematronics | United States | 1975 | — | 1 |
| Cinemaware | United States | 1986 | 3 | 3 |
| Cinemaware, Inc. | United States | — | — | 1 |
| Cinemax | Czech Republic | 1997 | 4 | 3 |
| Cinetévé | France | — | — | 1 |
| Cing | Japan | April 22, 1999 | 1 | — |
| CinéGroupe | — | 1974 | 1 | — |
| CIRCLE Entertainment | Hong Kong | May 2006 | — | 6 |
| Circus | Japan | 2000 | 5 | 2 |
| Circus Atos | Czech Republic | — | 1 | — |
| Citadel Studios | United States | 2013 | 1 | 1 |
| City Connection | Japan | April 2005 | 20 | 22 |
| Clap Hanz | Japan | April 2, 1998 | 9 | 1 |
| Claranova | France | — | — | 1 |
| Claytechworks | Japan | July 4, 2018 | 1 | — |
| Clear River Games | Sweden | 2020 | — | 4 |
| Cleversan Games | Poland | — | 3 | — |
| ClickBoom | Canada | 1994 | — | 1 |
| Clickteam | — | 1993 | 1 | 2 |
| Cliffhanger Productions | Canada | — | 1 | — |
| Climax Entertainment | Japan | 1990 | 2 | — |
| Clochette | Japan | — | 1 | 1 |
| ClockStone | Austria | 2006 | 7 | — |
| Clockup | Japan | 2002 | 4 | 4 |
| Clockwork Origins | Germany | — | 2 | 2 |
| Clouded Leopard Entertainment | — | August 16, 2019 | — | 4 |
| Cloudgine | United Kingdom | — | 1 | — |
| Clover Bite | Israel | 2014 | 1 | — |
| Clover Studio | Japan | July 2004 | 1 | — |
| CM Games | Estonia | 2010 | 1 | 1 |
| Coatsink | United Kingdom | 2009 | 3 | 7 |
| Cobra Mobile | United Kingdom | April 7, 2005 | 2 | 2 |
| Cobrasoft | France | 1985 | — | 1 |
| Cococucumber | Canada | 2014 | 3 | 3 |
| Cocodrilo Dog | Australia | — | 1 | — |
| Coconut Island Games | People's Republic of China | 2009 | — | 1 |
| Coconuts Japan | Japan | November 1985 | 1 | 1 |
| Code Mystics | Canada | 2009 | 2 | — |
| CodeCombat | United States | April 2013 | 1 | — |
| Codemasters | United Kingdom | 1986 | 31 | 59 |
| Coffee Addict Studio | Brazil | January 10, 2014 | 1 | — |
| Coffee Stain Studios | Sweden | 2010 | — | 2 |
| COGNOSPHERE | Singapore | 2021 | — | 5 |
| Cognosphere | People's Republic of China | February 13, 2012 | 9 | 7 |
| Cohort Studios | United Kingdom | March 2006 | 2 | — |
| Cokem International | — | 2000 | — | 1 |
| Coktel Vision | France | 1984 | 9 | 5 |
| ColePowered Games | United Kingdom | 2011 | 1 | — |
| Color Dreams | United States | 1988 | — | 1 |
| Colorful Palette | Japan | June 2018 | 1 | — |
| Colossus Game Studio | Brazil | 2015 | 7 | 7 |
| Colour Colliders | Austria | — | 1 | — |
| COMADSOFT | Poland | February 10, 2014 | 1 | 1 |
| Combat Waffle Studios | — | — | 1 | — |
| CommaVid | — | 1981 | 1 | 1 |
| Commodore International | United States | October 10, 1958 | — | 1 |
| Compedia | — | 1988 | 1 | — |
| Compulsion Games | Canada | 2009 | 1 | — |
| Computer Emuzone Games Studio | Spain | 2003 | 1 | — |
| Con Artist Games | Australia | — | 1 | — |
| Concept by Utrecht School of the Arts | Netherlands | — | 1 | — |
| Conradical Games | Switzerland | — | 3 | 1 |
| Conspiracy Entertainment | United States | 1997 | — | 2 |
| Contrail | — | October 16, 1997 | — | — |
| Cooking & Publishing | Spain | — | 2 | 3 |
| Cooking Mama Limited | Japan | — | 8 | — |
| Core Design | United Kingdom | 1988 | 12 | — |
| Corecell Technology Co. Ltd. | Thailand | 2002 | 1 | — |
| Coreplay | Germany | — | 1 | — |
| Cornfox & Bros. | Finland | — | 2 | 1 |
| COSEN Co., Ltd. | Japan | 2014 | — | 9 |
| Cosmi Corporation | United States | — | — | 9 |
| Cosmic Boop | United Kingdom | August 12, 2019 | 1 | — |
| Cosmonaut Studios | United Kingdom | 2015 | 1 | — |
| Cotton Game | People's Republic of China | 2013 | 5 | 4 |
| Covenant.dev | Poland | 2020 | 1 | 1 |
| COVER Corporation | Japan | June 13, 2016 | 1 | 2 |
| COWCAT Games | France | — | 1 | 1 |
| Cozy Bee Games | Canada | 2021 | 3 | 2 |
| Cpc-power.com | France | — | — | 1 |
| Cracked Heads Games | Russia | — | 1 | — |
| Cradle Games | Canada | April 2, 2015 | 2 | — |
| Crafting Legends | Germany | — | 1 | 1 |
| CRAFTWORK | — | — | — | 1 |
| Cranberry Production | Germany | 1997 | 3 | — |
| Craneballs | Czech Republic | 2008 | 1 | — |
| Crave Entertainment | United States | 1997 | 1 | 20 |
| Crawfish Interactive | United Kingdom | 1997 | 2 | — |
| Crazy Labs | Israel | 2011 | 2 | 2 |
| Crazy Monkey Studios | Belgium | 2010 | 4 | 4 |
| CrazyBunch | Germany | September 2014 | 3 | — |
| Crazysoft | Cyprus | — | 2 | 2 |
| Crea-Tech | Japan | 1988 | 4 | — |
| Creashock studios | Ukraine | — | 1 | 1 |
| Creat Studios | Russia | 1990 | 3 | 1 |
| Creative Assembly | United Kingdom | August 18, 1987 | 25 | — |
| Creative Assembly Sofia | — | 2001 | 1 | — |
| Creative Capers Entertainment | United States | 1989 | 1 | — |
| Creative Games & Computer Graphics Corporation | Taiwan | — | 1 | — |
| CreativeForge Games | Poland | 2011 | 3 | 5 |
| Creatures | Japan | November 8, 1995 | 11 | 3 |
| Crema | Spain | 2012 | 1 | — |
| Creoteam | Ukraine | 2005 | 1 | 1 |
| Crescent Moon Games | United States | 2009 | — | 9 |
| CreSpirit | Taiwan | — | 1 | 1 |
| CRI Middleware | Japan | August 2001 | 2 | — |
| Criterion Games | United Kingdom | 1993 | 18 | — |
| Critical Games | Australia | — | 1 | 1 |
| CRL Group | United Kingdom | 1982 | 3 | 4 |
| CROOZ | Japan | May 24, 2001 | 1 | — |
| Crossnet | Japan | September 1999 | — | 1 |
| Crosstalk Inc. | Japan | October 1979 | 1 | — |
| Croteam | Croatia | 1993 | 29 | 14 |
| Croteam Publishing | Croatia | — | — | 2 |
| Croteam VR | Croatia | — | 3 | — |
| Crowd | Japan | — | 5 | 5 |
| CRT GAMES | South Korea | October 16, 2020 | 2 | — |
| Crunching Koalas | Poland | 2012 | — | 2 |
| Crunchyroll | United States | May 14, 2006 | — | 1 |
| Crunchyroll, LLC | United States | — | — | 2 |
| Cryo Interactive | France | 1992 | 11 | 4 |
| Cryptic Studios | United States | June 2000 | 2 | — |
| Crypton Future Media | Japan | July 1995 | 6 | 3 |
| Crystal Dynamics | United States | 1992 | 18 | 1 |
| Crytek UK | United Kingdom | 1999 | 6 | — |
| Crytivo Games | United States | — | — | 8 |
| CSP Mobile GmbH | Germany | 1999 | 4 | 4 |
| CTW Inc. | Japan | August 14, 2013 | — | 4 |
| CUFFS | Japan | 2005 | 2 | 4 |
| Culture Brain | Japan | 1980 | 7 | 4 |
| Culture Publishers | Japan | — | — | 1 |
| Curve Games | United Kingdom | December 14, 2005 | 1 | 22 |
| Cyan Worlds | United States | 1987 | 10 | 6 |
| Cyanide | France | 2000 | 21 | — |
| CyberConnect2 | Japan | February 16, 1996 | 31 | 3 |
| CyberFront | Japan | 1998 | — | 3 |
| Cyberlore Studios | United States | 1992 | 3 | — |
| CyberPlanet Interactive | Thailand | 2000 | 1 | — |
| CyberStep Holdings | Japan | April 2000 | 2 | 5 |
| CyberWorks | Japan | — | 1 | 1 |
| Cyborn | Belgium | 1998 | 1 | 1 |
| Cyclone Zero | Japan | July 2007 | 4 | — |
| Cygames | Japan | 2011 | 8 | 7 |
| Cypronia | Slovakia | 1996 | 8 | — |
| Czech Games Edition | Czech Republic | July 12, 2007 | — | 1 |