| 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 | |
| Midway Games & GT Interactive | Publisher | |
| Midway Games LtdPAL | Publisher | |
| Midway Games West | DeveloperPublisher | |
| Midway GamesEU,NA | Publisher | |
| Midway GamesNA | Publisher | |
| Midway GamesNA, | Publisher | |
| Midway GamesNA,PAL | Publisher | |
| Midway GamesPAL | Publisher | |
| Midway Games] | Publisher | |
| Midway Home Entertainment | Publisher | |
| Midway Home EntertainmentNA | Publisher | |
| Midway L.A. | Developer | |
| Midway Studios | Developer | |
| Midway Studios Austin | Developer | |
| Midway Studios Newcastle | Developer | |
| Midway Studios San Diego | Developer | |
| Midway Studios – Los Angeles | Developer | |
| Midway Studios – Newcastle | Developer | |
| MidwayNA | Publisher | |
| Miegamicis | Developer | |
| Mientje | Developer | |
| Mig Entertainment | Publisher | |
| MigMigg | Developer | |
| Migdyn | Developer | |
| MiggyG | Developer | |
| Mighcty | Developer | |
| Might and Delight | Developer | |
| Mighty | Developer | |
| Mighty CheBo | Developer | |
| Mighty Craft | Developer | |
| Mighty Kingdom | Developer | |
| Mighty Morgan | Developer | |
| Mighty Owlbear | Developer | |
| Mighty Pebble Games | Developer | |
| Mighty Rabbit Studios | DeveloperPublisher | |
| Mighty Rocket Studio | Developer | |
| Mighty Studios | DeveloperPublisher | |
| MightyCraft | Developer | |
| MightyJor | Developer | |
| MightyKubo Games | Developer | |
| MightyPancake | Developer | |
| Mignonette_Silhouette | Developer | |
| Migo | Developer | |
| Miguel Angel Borreguero Quesada | Developer | |
| Miguel Angel Villas | Developer | |
| Miguel Antunes | Developer | |
| Miguel Blanco Viu | Developer | |
| Miguel Luz | Developer | |
| Miguel López | Developer | |
| Miguel Martinho | Developer | |