| Cliff J Ogden | Developer | |
| Cliff Johnson | DeveloperPublisher | |
| Cliff Lee CL | Developer | |
| Cliffhanger Productions | Developer | |
| CliffracerX | Developer | |
| Cliffside | Developer | |
| Climacus | Developer | |
| Climax | Developer | |
| Climax Brighton | Developer | |
| Climax Development | Developer | |
| Climax Entertainment | Developer | |
| Climax Graphics | Developer | |
| Climax Group | Developer | |
| Climax Solent | Developer | |
| Climax Studios | Developer | |
| Clinginglies | Developer | |
| Clip House | Developer | |
| ClipartDev | Developer | |
| Clipper | Developer | |
| Clipper Software | Developer | |
| Clive Brooker | Developer | |
| Clive Paul | Developer | |
| Clive Thompson | Developer | |
| Clive Townsend | Developer | |
| Clive Wilson | Developer | |
| Cloak and Dagger Games | Developer | |
| Cloaked Eye Software | Developer | |
| Cloaked Games | Developer | |
| CloakedBytes | Developer | |
| ClockStone | Developer | |
| Clockstone Studio | Developer | |
| Clockwize (Dean Hickingbottom) | Developer | |
| Clockwize (Gary Wood, Dean Hickingbottom) | Developer | |
| Clockwize (Keith A. Goodyer) | Developer | |
| Clockwize (Keith A. Goodyer, Dean Hickingbottom) | Developer | |
| Clockwize (Keith A. Goodyer, Dean Hickingbottom, David Bradley) | Developer | |
| Clockwize (Keith A. Goodyer, Dean Hickingbottom, David Bradley, David Whittaker) | Developer | |
| Clockwize (Keith A. Goodyer, Denis Hickie, Jaine Hickie) | Developer | |
| Clockwork Dragon Games | Developer | |
| Clockwork Games | Developer | |
| Clockwork Games Limited | Developer | |
| Clockwork Hippo | Developer | |
| Clockwork Pixels | Developer | |
| Clockwork Prince | Developer | |
| Clockwork Tortoise | Developer | |
| Clockwork bird | Developer | |
| CloneDeath | Developer | |
| Clorinthe | Developer | |
| Clotruad | Developer | |
| Cloud 9 Interactive | Developer | |