| 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 | |
| Matheus Tambosi | Developer | |
| Matheus Vicente | Developer | |
| MatheusCunegato | Developer | |
| MatheusMortatti | Developer | |
| MathewHD | Developer | |
| MathiO | Developer | |
| Mathias Feist | Developer | |
| Mathias Ody | Developer | |
| Mathieu GD | Developer | |
| Mathilda | Publisher | |
| Mathoslink | Developer | |
| Mathurin | Developer | |
| Matias Beckerle | Developer | |
| Matias Brunacci | Developer | |
| Matias Milewski | Developer | |
| MatiasDesu | Developer | |
| Matiasmcxd | Developer | |
| Matija Masek | Developer | |
| Matija Obrovac | Developer | |
| Matija Šikić | Developer | |
| Matilar | Developer | |
| MatildaSouthby | Developer | |
| Matin | Developer | |
| Matlahvi | Developer | |
| Matodan | Developer | |
| Matomatt | Developer | |
| Matote | Developer | |
| Matra Game Studio | Developer | |
| Matra Hachette | Developer | |
| Matris-Defectum | Developer | |
| Matrix | DeveloperPublisher | |
| Matrix Developments | Developer | |
| Matrix Games | DeveloperPublisher | |
| Matrix Software | Developer | |
| Mats | Developer | |
| Matsushita Electric Industrial | Developer | |
| Matsuuu | Developer | |
| Matt | Developer | |
| Matt Game Dad Dyet | Developer | |
| Matt Kupo Roszak | Developer | |
| Matt Beckett | Developer | |
| Matt Boyd-Surka | Developer | |
| Matt Boyer | Developer | |
| Matt Crees | Developer | |
| Matt Dabrowski | Developer | |
| Matt Daly | Developer | |
| Matt Donatelli | Developer | |
| Matt Dugan | Developer | |
| Matt Eland | Developer | |
| Matt Ellis | Developer | |
| Matt Fabius | Developer | |
| Matt Furniss | Developer | |
| Matt Glanville | Developer | |
| Matt Lieutier | Developer | |
| Matt Makes Games | DeveloperPublisher | |
| Matt McGill | Developer | |
| Matt Murch | Developer | |
| Matt O'Tousa | Developer | |
| Matt Patrick Walsh | Developer | |
| Matt Reeves | Developer | |
| Matt Rix | Developer | |
| Matt Thorson | Developer | |
| Matt Westcott[5] | Developer | |
| Matt Young | Developer | |
| Matt's Games | Developer | |
| Matt's Mouth | Developer | |
| MattBolere | Developer | |
| MattCarr | Developer | |
| MattDew | Developer | |
| MattFett | Developer | |
| MattFrith | Developer | |
| MattLeo | Developer | |
| MattMacob | Developer | |
| MattReardon | Developer | |
| MattWay | Developer | |
| MattWillis | Developer | |
| MattWoelk | Developer | |
| Mattabulous | Developer | |
| Mattchu Does Stuff | Developer | |
| Mattel | DeveloperPublisher | |
| Mattel Electronics | DeveloperPublisher | |
| Mattel Electronics Teletape Inc. | Developer | |
| Mattel Electronics Teletape Inc. APh Technological Consulting | Developer | |
| Mattel Games | Publisher | |
| Mattel Interactive | Publisher | |
| Mattel Media | DeveloperPublisher | |
| Matteo Moriani | Developer | |
| Matteo Vera | Developer | |
| Mattfox | Developer | |
| Matth33w | Developer | |
| Matthais Gerhardt | Developer | |
| Matthew | Developer | |
| Matthew Ager | Developer | |
| Matthew Alexander | Developer | |
| Matthew Cannon | Developer | |
| Matthew Codes | Developer | |
| Matthew Drakely | Developer | |
| Matthew Flewelling | Developer | |
| Matthew Gallant | Developer | |
| Matthew Garcia -2 | Developer | |