| Mario Germoliato | Developer | |
| Mario Jiménez | Developer | |
| Mario445 | Developer | |
| Mario8664 | Developer | |
| MarioKid | Developer | |
| MarioNieto | Developer | |
| MarioRamirez | Developer | |
| Mariochi | Developer | |
| Marioette | Developer | |
| Marionette | DeveloperPublisher | |
| Mariothedog | Developer | |
| Marius Mühleck | Developer | |
| Marius Winter | Developer | |
| Marjaq Micros | Developer | |
| Mark | Developer | |
| Mark A Jones | Developer | |
| Mark A. Jones | Developer | |
| Mark Alexander | Developer | |
| Mark Allen | Developer | |
| Mark Armbachtsheer | Developer | |
| Mark Baldock | Developer | |
| Mark Ball | Developer | |
| Mark Butler | Developer | |
| Mark Cale | Developer | |
| Mark Christie | Developer | |
| Mark Cooksey | Developer | |
| Mark Cross | Developer | |
| Mark Currie | Developer | |
| Mark Cushen | Developer | |
| Mark Descallar | Developer | |
| Mark Eason | Developer | |
| Mark Eyles | Developer | |
| Mark Ffrench | Developer | |
| Mark Fisher | Developer | |
| Mark Goodall | Developer | |
| Mark Haigh-Hutchinson | Developer | |
| Mark Harding | Developer | |
| Mark Harrap | Developer | |
| Mark Healey | Developer | |
| Mark Incley | Developer | |
| Mark Innes | Developer | |
| Mark Jacobs | Developer | |
| Mark Kelly | Developer | |
| Mark Kennedy | Developer | |
| Mark Li | Developer | |
| Mark Lucas | Developer | |
| Mark Mackey | Developer | |
| Mark Mandriota | Developer | |
| Mark Manyen | Developer | |
| Mark Potente | Developer | |
| Mark R Jones | Developer | |
| Mark R. Jones | Developer | |
| Mark Radocy | Developer | |
| Mark Rey | Developer | |
| Mark Ribeiro | Developer | |
| Mark Rivers | Developer | |
| Mark Rivers Lyndon Sharp | Developer | |
| Mark Robitaille | Developer | |
| Mark Rogers | Developer | |
| Mark Tait | Developer | |
| Mark Turmell | Developer | |
| Mark Uniacke | Developer | |
| Mark Viola | Developer | |
| Mark Wallace | Developer | |
| MarkAnime | DeveloperPublisher | |
| MarkGrass | Developer | |
| MarkT.moon | Developer | |
| MarkW250 | Developer | |
| MarkWatneyClubBand | Developer | |
| Mark_Goldsack | Developer | |
| Markadet | Developer | |
| Markal (Magical cat Lv20) | Developer | |
| Markanime Studios | Developer | |
| Marker | DeveloperPublisher | |
| Markerpullus | Developer | |
| Marko Pavlovic | Developer | |
| Markus Franz | Developer | |
| Markus Lindgren | Developer | |
| Markus Mensinger | Developer | |
| Markus Unger | Developer | |
| Markus Wuehl | Developer | |
| MarkusDev | Developer | |
| Marlin Media | Developer | |
| Marlon Voices Things | Developer | |
| Marlowe Dobbe | Developer | |
| Marmalade Game Studio | DeveloperPublisher | |
| Marmoreal Dev | Developer | |
| Marn S. | Developer | |
| Marolias | Developer | |
| Maroon Seal | Developer | |
| Maroufleurs | Developer | |
| Marple | Developer | |
| Marplebot | Developer | |
| Marquis Kurt | Developer | |
| Marquitos | Developer | |
| Marron121 | Developer | |
| Mars | Developer | |
| Mars Ashton | Developer | |
| Mars B. | Developer | |
| MarsLit Games | DeveloperPublisher | |
| MarsUnderground | Developer | |
| Marshal Ruffy | Developer | |
| Marshall Cannon | Developer | |
| MarshallWorks | Developer | |
| Marshlight Software | Developer | |
| Marshmallow9 | Developer | |
| Marshy | Developer | |
| Marslit Games | DeveloperPublisher | |
| Marson | Developer | |
| Marsu | Developer | |
| Martech | DeveloperPublisher | |
| Martech Games | DeveloperPublisher | |
| Martech Software | DeveloperPublisher | |
| Martelo | Developer | |
| Marten Jonsson | Developer | |
| Martenfur | Developer | |
| Martha | Developer | |
| Martha S.E.E | Developer | |
| Martholemy | Developer | |
| MartholemyLabs | Developer | |
| Marti Wong | Developer | |
| Martial Hesse-Dreville | Developer | |
| Martian's Parlor Entertainment | Developer | |
| MartianGames | Developer | |
| Martim Freitas | Developer | |
| MartimDev | Developer | |
| Martin | Developer | |
| Martin Džejky Jakubik | Developer | |
| Martin Ao | Developer | |
| Martin Asteasuain | Developer | |
| Martin Beierling | Developer | |
| Martin Bussy-Pâris | Developer | |
| Martin Calujek | Developer | |
| Martin Cohen | Developer | |
| Martin Delemotte | Developer | |
| Martin Donald | Developer | |
| Martin Galway | Developer | |
| Martin Harris | Developer | |
| Martin Haye | DeveloperPublisher | |
| Martin Holland | Developer | |
| Martin Hooley | Developer | |
| Martin Isla | Developer | |
| Martin Jacob | Developer | |
| Martin Magni | Developer | |
| Martin Magnusson | Publisher | |
| Martin Marietta | Publisher | |
| Martin McDonald | Developer | |
| Martin Nerurkar | Developer | |
| Martin Piper | Developer | |
| Martin Salomon | Developer | |