| Cadenza Interactive |
| Camelot Software Planning |
| Candygun Games |
| Capcom |
| Capybara Games |
| Carbonated Games |
| Career Software |
| Cat Daddy Games |
| Catnip Games |
| Cavia |
| CCP games |
| CCR |
| CD Projekt RED |
| cdv Software Entertainment USA |
| Cenega |
| Cerasus Media |
| Certain Affinity |
| Chair Entertainment Group |
| ChangYou.com |
| Chaos Concept |
| Chris Sawyer |
| Chunsoft |
| Cinemaware |
| Cing Inc. |
| CiRCLE |
| Circus Freak Studios |
| City Interactive |
| Clap Hanz |
| Clever's Games |
| Climax |
| Clover Studio |
| Codemasters |
| Coldwood Interactive |
| Comcept Inc. |
| Compulsion Games |
| Computer Artworks |
| Confounding Factor |
| Conspiracy Entertainment |
| Cooking Mama Ltd. |
| CoolNet |
| COREPLAY |
| Coresoft Games |
| Cornered Rat Software |
| Cowboy Rodeo |
| Coyote Console |
| Crafts & Meister |
| Crave Entertainment |
| Crazy Monkey Studios |
| Creat Studio |
| Creative Assembly |
| Creatures Inc |
| Criterion Games |
| Croteam |
| CrunchTime Games Inc. |
| Cryptic Studios |
| Crypton Future Media |
| Crystal Dynamics |
| Crytek |
| CS1 Team |
| CSO Simtek |
