| Masaya Games | Developer | |
| MasayaJP | Publisher | |
| Maschinen-Mensch | Developer | |
| Mascot1063 | Developer | |
| Masen Sodki | Developer | |
| MashArcade | Developer | |
| MashUp Games | Developer | |
| Masha [they | Developer | |
| Mashikouli | Developer | |
| Mashuun | Developer | |
| Mason Lindroth | Developer | |
| Mason64 | Developer | |
| MasonButterwick | Developer | |
| MasonMasonoff | Developer | |
| Masonzk | Developer | |
| Masque Publishing | Publisher | |
| Mass Creation | DeveloperPublisher | |
| Mass Media | Developer | |
| Mass Media Games | Developer | |
| Mass Media Inc. | Developer | |
| Mass Media, Inc. | Developer | |
| Mass Tael | Developer | |
| MassHive Media | Developer | |
| Massi | Developer | |
| Massimo Albano Games | Developer | |
| Massive Damage, Inc. | Developer | |
| Massive Development | Developer | |
| Massive Entertainment | Developer | |
| Massive Galaxy Studios | Developer | |
| Massive Miniteam | Developer | |
| Massive Monster | Developer | |
| Master Chameleon Games | Developer | |
| Master Designer Software | Developer | |
| Master King® | Developer | |
| Master Krepta | Developer | |
| Master Pose | Developer | |
| Master U.O.M.U. | Developer | |
| Master.typeX | Developer | |
| MasterDevGames | Developer | |
| MasterMilkX | Developer | |
| MasterMoni | Developer | |
| MasterOX | Developer | |
| MasterOfSome | Developer | |
| MasterPaletteProductions | Developer | |
| Masterdd15 | Developer | |
| Masterlime | Developer | |
| MastermindV | Developer | |
| Masterpiece | DeveloperPublisher | |
| Masterplay Publishing | DeveloperPublisher | |
| Mastertronic | DeveloperPublisher | |
| Mastertronic Added Dimension | Publisher | |
| Mastertronic Group | DeveloperPublisher | |
| Mastertronic Group Ltd.EU | Publisher | |
| Mastertronic Plus | Publisher | |
| MastertronicAU | Publisher | |
| MastertronicEU | Publisher | |
| Masthead Studios | Developer | |
| Mastiff | DeveloperPublisher | |
| Mastiff (North America) | Publisher | |
| MastiffNA | Publisher | |
| Mastoast | Developer | |
| Mastro2k | Developer | |
| MastroBros | Developer | |
| Masudaya | DeveloperPublisher | |
| Masudaya Corporation | DeveloperPublisher | |
| Mat | Developer | |
| Mat Buckland | Developer | |
| MatHolzmann | Developer | |
| MatRN | Developer | |
| Mat_dev | Developer | |
| Matalla Interactive | Developer | |
| Matchaa Studio | Developer | |
| Matchbox | Publisher | |
| Mate Cocido | Developer | |
| Mate Cziner | Developer | |
| Mate Rogers | Developer | |
| Matek | Developer | |
| Mateo | Developer | |
| Mateoox600 | Developer | |
| Materwelons | Developer | |
| Mateus | Developer | |
| Mateus Ikezaki | Developer | |
| Mateus Pavan | Developer | |
| Mateus Prates Simões | Developer | |
| MateusBomfim | Developer | |
| MateusHyp | Developer | |
| MateusIndieDev | Developer | |
| MateusQuadros | Developer | |
| MateusRocha | Developer | |
| Mateusz Kołodziejczyk | Developer | |
| Mateusz Skutnik | Developer | |
| MateuszDlugosz | Developer | |
| Mateusz_Fisch | Developer | |
| Matex77 | Developer | |
| Math Dev | Developer | |
| Mathantastic Productions | Developer | |
| Mathbear | Developer | |
| Matheus Bigogno | Developer | |
| Matheus Mortatti | Developer | |
| Matheus Petrus | Developer | |