| C's Ware | — | — | video game industry |
| Cabbage Soft | — | — | video game industry |
| California Pacific Computer Company | Davis | 1979 | video game industry |
| Camouflaj | — | — | — |
| Canal+ Multimedia | — | 1995 | video game industry |
| Canalside Studios | Huddersfield | — | — |
| Canari Games | — | 2018 | video game industry |
| Candygun Games UG | Hamburg | 2009 | — |
| Capcom Production Studio 4 | — | 1999 | video game industry |
| Capricia Productions | Jerusalem | 2013 | video game industry |
| Capybara Games | Toronto | 2003 | video game industry |
| Carbonated Games | Redmond | 2004 | video game industry |
| Career Soft | Japan | June 1996 | video game industry |
| Cartoon Network Studios | Burbank | 1994 | television |
| Cascade Games | — | — | — |
| Cat Daddy Games | Bellevue | 1996 | video game industry |
| Catear | — | — | video game industry |
| Cauldron | Bratislava | 1996 | video game industry |
| Causa Creations | Vienna | 2014 | video game industry |
| CAVE | Meguro | June 15, 1994 | video game industry |
| Cavia | Meguro, Roppongi | March 2000 | video game industry |
| Cavyhouse | — | — | video game industry |
| CBE Software | Brno | 2006 | video game industry |
| CCCP Games | Moscow | 2004 | — |
| CD Bros. | — | 1994 | video game industry |
| CD Projekt | Warsaw | May 1994 | video game industry |
| CD Projekt RED | Warsaw, Łódź | February 2002 | video game industry |
| Cdp.pl | Warsaw | 2012 | video game industry |
| CEA Saclay | — | — | — |
| Celeris | Los Angeles | 1987 | video game industry |
| Cenega | Poland | — | — |
| Centauri Production | Prague | 2000 | video game industry |
| CGA Studio Games | Liverpool | November 2, 2021 | — |
| CGE Digital | Prague | August 5, 2015 | video game industry |
| Chair Entertainment | Salt Lake City | 2005 | video game industry |
| Chaos Group Games | — | 2016 | video game industry |
| Chasing Rats Games | Montreal | 2018 | — |
| Cheetah Mobile | Chaoyang District | 2009 | mobile app |
| Chengdu Nekoday Network Technology Co., Ltd. | Jinjiang District | August 7, 2018 | game industry |
| ChiliDog Interactive | — | — | video game industry |
| Chilla's Art | — | — | independent video game development |
| Chillingo | Macclesfield | 2002 | — |
| Chorus Worldwide | — | — | video game industry |
| Chromatic Games | Gainesville | December 14, 2009 | video game industry |
| Chronic Logic | Santa Cruz | 2001 | video game industry |
| Chubby Pixel | Milan | 2012 | video game development |
| Chucklefish | London | — | video game industry |
| Chunkybox Games | Brisbane | — | video game industry |
| Cinetévé | Paris | — | — |
| CinéGroupe | Montreal | 1974 | animation studio |
| Circle Studio | Derby | October 2003 | — |
| Circus | Hasuda | 2000 | video game industry |
| Circus Atos | Prague | — | video game industry |
| City Connection | — | April 2005 | — |
| Clap Hanz | Yokohama | April 2, 1998 | video game industry |
| Claranova | La Garenne-Colombes | — | activities of head offices |
| Clear River Games | — | 2020 | — |
| Cleversan Games | Łódź | — | video game industry |
| ClickBoom | — | 1994 | video game industry |
| Cliffhanger Productions | — | — | creative industries |
| Climax Entertainment | Shinjuku | 1990 | video game industry |
| Climax Studios | City of Portsmouth, Portsmouth | 1988 | — |
| Clochette | — | — | video game industry |
| Clockwork Games Limited | — | — | — |
| Clockwork Origins | — | — | video game industry |
| Clouded Leopard Entertainment | Tokyo | August 16, 2019 | video game industry |
| Cloudgine | Edinburgh | — | — |
| Cloudscan | — | — | — |
| CM Games | Tallinn | 2010 | video game industry |
| Coatsink | — | 2009 | — |
| Cobra Mobile | Dundee | April 7, 2005 | — |
| Cococucumber | Toronto | 2014 | video game industry |
| Coconut Island Games | Putuo District | 2009 | video game industry |
| Code Mystics | Vancouver | 2009 | video game industry |
| Codo Technologies | — | — | — |
| COGNOSPHERE | Jurong East | 2021 | video game industry |
| Cohort Studios | Cardiff | March 2006 | — |
| Coin Crew Games | — | 2018 | video game industry |
| Cokem International | Shakopee | 2000 | Distribution |
| Coktel Vision | Meudon | 1984 | video game industry |
| ColePowered Games | Bristol | 2011 | — |
| Color Dreams | — | 1988 | video game industry |
| Colossus Game Studio | — | 2015 | video game industry |
| Commodore International | West Chester | October 10, 1958 | video game industry |
| Concept by Utrecht School of the Arts | Utrecht | — | video game industry |
| Contrail | Tokyo | October 16, 1997 | video game industry |
| Cooking & Publishing | Málaga | — | video game industry |
| Core Design | Derby | 1988 | — |
| Corecell Technology Co. Ltd. | — | 2002 | video game industry |
| Cosmic Boop | Sheffield | August 12, 2019 | — |
| Cosmonaut Studios | Liverpool | 2015 | — |
| Cosmos Computer | — | — | video game industry |
| Cosmos Designs | — | — | video game industry |
| Covenant.dev | Warsaw | 2020 | video game industry |
| COVER Corporation | Tachō | June 13, 2016 | entertainment industry |
| Covert Operations Ltd | London | 2000 | — |
| Cozy Bee Games | — | 2021 | video game industry |
| CP Verlag | — | — | video game industry |
| Cracked Heads Games | Yakutsk | — | video game industry |
| Crafting Legends | Berlin | — | — |
| Crawfish Interactive | Croydon | 1997 | video game industry |
| Crazy Labs | Tel Aviv | 2011 | video game industry |
| Crazy Monkey Studios | Kontich | 2010 | video game industry |
| CrazyBunch | Hamburg | September 2014 | video game industry |
| Crea-Tech | Kōtō | 1988 | video game industry |
| Creative Assembly | Horsham | August 18, 1987 | — |
| Creative Games & Computer Graphics Corporation | — | — | video game industry |
| Creative Reality | Portsmouth | 1989 | — |
| CRI Middleware | Tokyo | August 2001 | video game industry |
| Criterion Games | Guildford | 1993 | — |
| Critical Games | — | — | video game industry |
| Croteam | Zagreb | 1993 | video game industry |
| Croteam VR | — | — | — |
| Crowd | — | — | — |
| CRT GAMES | — | October 16, 2020 | video game industry |
| Crunchyroll, LLC | Coppell | — | — |
| Cryo Interactive | Paris | 1992 | video game industry |
| Cryptic Studios | Los Gatos | June 2000 | video game industry |
| Crypton Future Media | Sapporo | July 1995 | video game industry |
| Crystal Computing | Manchester | 1982 | — |
| Crystal Dynamics | Redwood City | 1992 | video game industry |
| Crystal Game Works | — | — | video game industry |
| Crystal Squid | — | 2003 | — |
| Crytek UK | Nottingham | 1999 | — |
| Cult Games | — | — | — |
| Culture Brain | Tokyo | 1980 | video game industry |
| Cyan Worlds | Wilmington, Mead | 1987 | video game industry |
| CyberFront | Chūō | 1998 | video game industry |
| CyberPlanet Interactive | Thailand | 2000 | video game industry |
| Cyberstyle | — | — | — |
| CyberWorks | Ono | — | — |
| Cygames | Tokyo | 2011 | video game industry |
| Cypronia | Slovakia, Michalovce | 1996 | video game industry |
| Çınar'sArt | — | — | video game industry |