| Butterscotch Shenanigans | United States | 2012 | 3 | 3 |
| Byking | Japan | — | 1 | — |
| ByteRealms | Spain | 2010 | — | 1 |
| Byterunners | Poland | — | 1 | — |
| Bytten Studio | United Kingdom | May 17, 2019 | 1 | — |
| 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 | — |