| 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 | |