| Microsoft ACES Studio | Developer | |
| Microsoft Corporation | DeveloperPublisher | |
| Microsoft Foundry | Developer | |
| Microsoft Game Studios | DeveloperPublisher | |
| Microsoft Games | Publisher | |
| Microsoft Games Studios | Publisher | |
| Microsoft Research | Developer | |
| Microsoft Research Cambridge | Developer | |
| Microsoft Studios | Publisher | |
| Microsphere | Publisher | |
| Microtac Software | Developer | |
| Microvalue | DeveloperPublisher | |
| Microvision | Developer | |
| Microwave Games | Developer | |
| Microïds | DeveloperPublisher | |
| MicroïdsEU | Publisher | |
| Mid Carolina Media | DeveloperPublisher | |
| MidBoss | DeveloperPublisher | |
| MidNite Entertainment Group | Developer | |
| MidNite Software | Developer | |
| Midas | DeveloperPublisher | |
| Midas Interactive | DeveloperPublisher | |
| Midas Interactive Entertaimnent | DeveloperPublisher | |
| Midas Interactive Entertainment | DeveloperPublisher | |
| Midas Interactive EntertainmentEU | Publisher | |
| Midas Interactive EntertainmentPAL | Publisher | |
| Midas InteractivePAL | Publisher | |
| MidasEU | Publisher | |
| Midcode | Developer | |
| Midcoin | Publisher | |
| Middle Mouse | Developer | |
| Midgar Studio | DeveloperPublisher | |
| Midian Design | Developer | |
| Midil | Developer | |
| Midipixel | Developer | |
| Midnight City | Publisher | |
| Midnight Games | Developer | |
| Midnight Hub | DeveloperPublisher | |
| Midnight Productions | Developer | |
| Midnight Software | Developer | |
| Midnight Spire Games | Developer | |
| Midnight Status | DeveloperPublisher | |
| Midnight Synergy | Developer | |
| Midoski | Developer | |
| Midrax | Developer | |
| Midway | DeveloperPublisher | |
| Midway (NA) | Publisher | |
| Midway Austin | Developer | |
| Midway Chicago | Developer | |
| Midway Games | DeveloperPublisher | |