| CJ Internet | Publisher | |
| CJ Internet Corporation | Publisher | |
| CJ Legato | Developer | |
| CK Games | Developer | |
| CKDev | Developer | |
| CKN Game Dev | Developer | |
| CKStudios | Developer | |
| CKYDT | Developer | |
| CKana | Developer | |
| CKoenem1 | Developer | |
| CLCE & Planet | Developer | |
| CLOAD | Publisher | |
| CLOUDs GIGA-RENSYA | Developer | |
| CLOWN | Developer | |
| CLYDE | Developer | |
| CLeN | Developer | |
| CLiolios | Developer | |
| CM42 | Developer | |
| CM9 | Developer | |
| CMG | Developer | |
| CMGCenterGDI | Developer | |
| CNIAngel | Developer | |
| CO2-PRO | DeveloperPublisher | |
| CO5MONAUT | Developer | |
| CODEWARE | Developer | |
| COFFEE GHOST STUDIOS | Developer | |
| COMAD GmbH | Developer | |
| COMBOPUNK | Developer | |
| COMP22 | Developer | |
| COMPUTE! | DeveloperPublisher | |
| COMPUTE! Publications | DeveloperPublisher | |
| COMPUTE! Publications, Inc. | Publisher | |
| COOKIE MAN | Developer | |
| COR Entertainment | Developer | |
| CORE Design | Developer | |
| CORE Design (Ben Daglish) | Developer | |
| CORE Design (Stuart Gregg) | Developer | |
| CORE Games | Developer | |
| COSEN | Publisher | |
| COSMI | DeveloperPublisher | |
| COWCAT | Developer | |
| CP Software | Developer | |
| CP-Dimensions | Developer | |
| CP.BRAiN | Developer | |
| CPIO Multimédia | Developer | |
| CPMGameDev | Developer | |
| CPP Game Design & Development Club | Developer | |
| CPand | Developer | |
| CRACTICUSLY | Developer | |
| CRATR.games | Developer | |
| CREATIVE STUDIO COMANDO2 | Developer | |
| CREΛTΞXION OFFICIAL | Developer | |
| CRI | DeveloperPublisher | |
| CRINGY CRIMMER | Developer | |
| CRJ | Developer | |
| CRL | Publisher | |
| CRL Group | Publisher | |
| CRL Group PLC | DeveloperPublisher | |
| CRShepherd | Developer | |
| CRT Factory | DeveloperPublisher | |
| CS | DeveloperPublisher | |
| CS1 Team | Developer | |
| CSG Imagesoft | Publisher | |
| CSK | DeveloperPublisher | |
| CSK JP | Publisher | |
| CSK Research | Publisher | |
| CSK Research Institute | Publisher | |
| CSK Research Institute Corp. | DeveloperPublisher | |
| CSKJP | Publisher | |
| CSO Simtek | Developer | |
| CSO Studios | Developer | |
| CSR-Studios | Developer | |
| CSaratakij | Developer | |
| CStalker | Developer | |
| CT Games | Developer | |
| CTA Developments | Developer | |
| CTLB | Developer | |
| CTN-Originals | Developer | |
| CTNeptune | Developer | |
| CTXM | Developer | |
| CUE SoftSwap | Publisher | |
| CURIA PRODUCTION | Developer | |
| CW Studios | Developer | |
| CW-Games | DeveloperPublisher | |
| CWGames | Developer | |
| CWRU-EECS390 | Developer | |
| CWoolz | Developer | |
| CXLTFVKE | Developer | |
| CXTM | Developer | |
| CZeroTwo | Developer | |
| C_Ryder | Developer | |
| CaCh | Developer | |
| CaGames | Developer | |
| CaLaBaTStudios | Developer | |
| CaTBoNe Games | Developer | |
| Cab | Developer | |
| Cabezotta | Developer | |
| Cabidge | Developer | |
| Cable Software | Publisher | |
| Cabreira | Developer | |