| Martin Schweiger | Developer | |
| Martin Senges | Developer | |
| Martin Severn | Developer | |
| Martin Software Productions | Publisher | |
| Martin Starešinčić | Developer | |
| Martin Tale | Developer | |
| Martin Ulrich | Developer | |
| Martin Walker | Developer | |
| Martin Ward | Developer | |
| MartinBousquet | Developer | |
| MartinSchubert | Developer | |
| MartinTristan | Developer | |
| Marty Green | Developer | |
| Martyn | Developer | |
| Martyn Hartley | Developer | |
| Martynas | Developer | |
| Martí Guillot Torrodà | Developer | |
| Martín Salvador Sosa | Developer | |
| Marubeni | Developer | |
| Marudice | Developer | |
| Marumittu | Developer | |
| Marvel | Publisher | |
| Marvel Soft | Publisher | |
| Marvelous | DeveloperPublisher | |
| Marvelous AQL | DeveloperPublisher | |
| Marvelous Entertainment | DeveloperPublisher | |
| Marvelous Entertainment (JP) | Publisher | |
| Marvelous EntertainmentJP | Publisher | |
| Marvelous Europe | Publisher | |
| Marvelous First Studio | Developer | |
| Marvelous Inc. | DeveloperPublisher | |
| Marvelous Interactive | DeveloperPublisher | |
| Marvelous Interactive (Japan) | Publisher | |
| Marvin Glass and Associates | Developer | |
| Marx The Modder | Developer | |
| Marxtodon | Developer | |
| Mary | Developer | |
| Mary Arroz | Developer | |
| Mary K | Developer | |
| Mary McK | Developer | |
| Mary T. | Developer | |
| Mary-Margaret | Developer | |
| MaryMajesty | Developer | |
| MaryTeam | Developer | |
| Marzar | Developer | |
| MasTho0128 | Developer | |
| MasangSoft | Developer | |
| Masatoko Games | DeveloperPublisher | |
| Masaya | DeveloperPublisher | |
| Masaya (JP) | Publisher | |