| Mahou Shoujo ☆ Magical Moestar | Developer | |
| MahouJP | Publisher | |
| Mai | Developer | |
| Maibbit | Developer | |
| MaikoEntertainment | Developer | |
| Mail.ru | Developer | |
| Main Tank Software | Developer | |
| MainMacree | Developer | |
| Mainc | Developer | |
| Maingron | Developer | |
| Mainichi Communications | DeveloperPublisher | |
| Mainichi Communications Inc | Developer | |
| Maitai Entertainment | Developer | |
| Maithonis | Developer | |
| MajamiLTU | Developer | |
| Majao Games | Developer | |
| MajdAbdulqadir | Developer | |
| Majesco | Publisher | |
| Majesco Entertainment | DeveloperPublisher | |
| Majesco Entertainment (North America) | Publisher | |
| Majesco EntertainmentAU,NA | Publisher | |
| Majesco EntertainmentNA | Publisher | |
| Majesco NA | Publisher | |
| Majesco Sales | DeveloperPublisher | |
| Majestic Studios | Developer | |
| Majestic Twelve | Developer | |
| MajesticLamb | Developer | |
| Majid Games | Developer | |
| Majikeyric | Developer | |
| Majlo | Developer | |
| Major Developments | Developer | |
| Major Developments (Chris Andrews, Paul Gregory, Stephen Northcott) | Developer | |
| Major Developments (Ian Andrew, Chris Andrew, Stephen Northcott) | Developer | |
| Majorariatto | Developer | |
| Mak_Makers | Developer | |
| Mak_Sensei | Developer | |
| Makashinga | Developer | |
| Make | Developer | |
| Make Play Code | Developer | |
| Make Soft | DeveloperPublisher | |
| Make Software | DeveloperPublisher | |
| Makena Technologies | Developer | |
| Maker Hacks | Developer | |
| Maker School | Developer | |
| Makh-Shevet | DeveloperPublisher | |
| MakhamDev | Developer | |
| Makhor | Developer | |
| Maki | Developer | |
| Makin'Games | Developer | |
| MakinGames | Developer | |