| Mercury Games | DeveloperPublisher | |
| Mercury Steam Entertainment | Developer | |
| MercuryBD | Developer | |
| MercurySteam | DeveloperPublisher | |
| Mere Mortals | Developer | |
| Merge Games | DeveloperPublisher | |
| Mericita | Developer | |
| Meridian4 | DeveloperPublisher | |
| Merit Software | DeveloperPublisher | |
| Merit Studio | Developer | |
| Merit Studios | DeveloperPublisher | |
| Merj Media | Publisher | |
| Merlandese | Developer | |
| Merle | Developer | |
| Merlijn Van Holder | Developer | |
| MerlinTheWizard | Developer | |
| Mermaid Studios | Developer | |
| Mernok | Developer | |
| Merow | Developer | |
| Merpui | Developer | |
| Merry Hospelhorn | Developer | |
| Merscom | DeveloperPublisher | |
| MeruJane | Developer | |
| Merve | Developer | |
| Merve Rida | Developer | |
| Mervin James | Developer | |
| Mervyn J Estcourt | Developer | |
| Mervyn J. Estcourt | Developer | |
| Mesa Logic | Developer | |
| Mesange Arts | Developer | |
| Mesitas | Developer | |
| Mesmerize Games | Developer | |
| MessBuilds | Developer | |
| MessagedGames | Developer | |
| Messhof | DeveloperPublisher | |
| Messij | Developer | |
| Meta Publishing | Publisher | |
| MetagameMike | Developer | |
| Metagaming B.V. | Developer | |
| MetalCat | Developer | |
| MetalChouchen | Developer | |
| MetalGameDev | Developer | |
| MetalZebra | Developer | |
| Metaleptic | Developer | |
| Metalfusion | Developer | |
| Metalhead Software | DeveloperPublisher | |
| Metalmastery | Developer | |
| Metalstorm | Developer | |
| Metamorf Studios | Developer | |
| Metamorpho_SG | Developer | |
| Metanet Software | DeveloperPublisher | |
| Metaparadox | Developer | |
| MetaphoricalSheep | Developer | |
| MetaphysicsStudios | Developer | |
| Metarevelations | Developer | |
| Metater | Developer | |
| Metellus | Developer | |
| MeteorArts | Developer | |
| Meteotrix | Developer | |
| Methodic Solutions | DeveloperPublisher | |
| Metrax | Developer | |
| MetricZero | Developer | |
| Metricsystem | Developer | |
| Metro | DeveloperPublisher | |
| Metro 3D | DeveloperPublisher | |
| Metro 3DEU | Publisher | |
| Metro Corporation | DeveloperPublisher | |
| Metro Graphics | Developer | |
| Metro3D | DeveloperPublisher | |
| Metro3D Europe | Publisher | |
| Metro3D NA | Publisher | |
| Metro3D, Inc. | Publisher | |
| Metro3DEU | Publisher | |
| Metro3DEU,NA | Publisher | |
| MetroJP | Publisher | |
| Metroixer | Developer | |
| Metronomik | Developer | |
| Metropolis Software | Developer | |
| Metropolis Software House | DeveloperPublisher | |
| Metylene | Developer | |
| Mev Dinc | Developer | |
| MevLyshkin | Developer | |
| MevnieEnn | Developer | |
| Meyer | Developer | |
| Meyush | Developer | |
| Mez Breeze | Developer | |
| Mezix | Developer | |
| Mezorno | Developer | |
| Mezzelo | Developer | |
| Mgaia Studio | Developer | |
| Mgame USA Inc. | Publisher | |
| MhamadTahir44 | Developer | |
| MhrGames | Developer | |
| Mi-Clos Studio | Developer | |
| Mi1k | Developer | |
| MiCROViSiON | Developer | |
| MiCROViSion | Developer | |
| MiCROViSion Inc. | Developer | |
| MiFuWorks | Developer | |
| MiSou Games | Developer | |