| Computer Applications Unlimited | DeveloperPublisher | |
| Computer Artworks | Developer | |
| Computer Artworks Ltd. | Developer | |
| Computer Easy | Publisher | |
| Computer Engineering Services | Developer | |
| Computer Magic, Ltd. | Developer | |
| Computer Recreations | Publisher | |
| Computer Specialties | Publisher | |
| Computer Vs World | Developer | |
| Computer and Video Games | Publisher | |
| Computer's Dream | Developer | |
| ComputerCow | Developer | |
| ComputerEasy | Publisher | |
| ComputerJames | Developer | |
| Computerology | Developer | |
| Computersmiths | Publisher | |
| Computing Specialties | Publisher | |
| Comrade_Crawdad | Developer | |
| Comsoft | Publisher | |
| Comtec | Developer | |
| Conan Software | DeveloperPublisher | |
| Concept Animations (Neil Dodwell, Dave Dew) | Developer | |
| Concept Software (John Heap, Paul Clancey) | Developer | |
| Conceptgame | Developer | |
| Conception Software | Developer | |
| ConcernedApe | DeveloperPublisher | |
| Concrete Games | Developer | |
| Concrete Games Research Lab | Developer | |
| Condor | Developer | |
| Condor Software | Developer | |
| Condor, Inc. | Developer | |
| Coneja Mutante | Developer | |
| Confounding Factor | Developer | |
| Confused Pelican | DeveloperPublisher | |
| Congenial Telegram | Developer | |
| Conjured | Developer | |
| Conk | Developer | |
| Connect Line | DeveloperPublisher | |
| Connecta | Developer | |
| Connected Content Group | Developer | |
| ConnnK | Developer | |
| Connor Aguilar | Developer | |
| Connor Sherlock | Developer | |
| Connor Thomas Cleary | Developer | |
| Connor Wolf | Developer | |
| ConnorORT | Developer | |
| Connorfett | Developer | |
| Conor Hehr | Developer | |
| Conor Mccann | Developer | |
| Conor Mulligan | Developer | |