| MorkSmith | Developer | |
| Morning Star Multimedia | Developer | |
| Morning Toast | Developer | |
| MorningPersonGames | Developer | |
| Morningtou | Developer | |
| Moroi Springs | Developer | |
| MorphAll | Developer | |
| Morphbreed | Developer | |
| Morphcat Games | Developer | |
| Morpheme Game Studios | Developer | |
| MorpheusKitami | Developer | |
| Morphious86 | Developer | |
| Morris | Developer | |
| Mors | Developer | |
| MortMort | Developer | |
| Mort_on | Developer | |
| MortalGames | Developer | |
| Morteshka | Developer | |
| Morton Games | Developer | |
| Mortup | Developer | |
| Morwe | Developer | |
| Morwood Software | Publisher | |
| Mosaic Publishing | Publisher | |
| Mosaic Software | Publisher | |
| Moscoso Maximiliano | Developer | |
| Moses Sola-Oke | Developer | |
| Mosh | Developer | |
| Mosha Games | Developer | |
| Moshe Linke | Developer | |
| Moss | DeveloperPublisher | |
| Moss LTD | Developer | |
| Moss Salamander | Developer | |
| Moss. | Developer | |
| MossHappyPlace | Developer | |
| Mossmouth | DeveloperPublisher | |
| Most Wanted Entertainment | Developer | |
| MotGameStudio | Developer | |
| Mother Gaia Studio | Developer | |
| Mother Serpent | Developer | |
| Mothership Entertainment | Developer | |
| MotiDev | Developer | |
| Motion Twin | DeveloperPublisher | |
| MotionSorcery | Developer | |
| MotiveTime | Developer | |
| MotiveTime, Ltd. | Developer | |
| Motivetime | Developer | |
| Motivetime Ltd. | Developer | |
| Motoko | Developer | |
| Motor | Developer | |
| Motown Software | Publisher | |
| Motquu | Developer | |
| Mottzy | Developer | |
| Motvind Studios | Developer | |
| Mouch | Developer | |
| Mouldy Toof Studios | Developer | |
| Moult | Developer | |
| Mounir Tohami | Developer | |
| MounirDev | Developer | |
| Mountain King Studios | DeveloperPublisher | |
| Mountain Sheep | Developer | |
| Mountains | Developer | |
| MouradZzz | Developer | |
| Mouse Potato Games | Developer | |
| Mouse Systems Corporation | DeveloperPublisher | |
| Mouse123 | Developer | |
| Mousechief | DeveloperPublisher | |
| MoustacheBanana | Developer | |
| Moustafa ELwasif | Developer | |
| Moustave | Developer | |
| Moux | Developer | |
| Mouzone | Developer | |
| Move Interactive | DeveloperPublisher | |
| Movie Battles Team | DeveloperPublisher | |
| Movie Software | Developer | |
| Moving Dimensions | DeveloperPublisher | |
| Moving Pieces Interactive | Developer | |
| Moving Player | DeveloperPublisher | |
| Movisoft | Developer | |
| Mozart | Developer | |
| Mozy | Developer | |
| Mozz | Developer | |
| Mpak | Developer | |
| Mpen | Developer | |
| Mr Bread Games | Developer | |
| Mr Chip Software (Steve Parys, Andrew Morris, Tony Kelly) | Developer | |
| Mr Dino28 | Developer | |
| Mr Frog | Developer | |
| Mr Micro (John May, John White) | Developer | |
| Mr MozaicDev Inc | Developer | |
| Mr Powder | Developer | |
| Mr Rutabaga | Developer | |
| Mr catso mcfatso | Developer | |
| Mr. Arrecis | Developer | |
| Mr. Bagini | Developer | |
| Mr. Gann | Developer | |
| Mr. Heutheer | Developer | |
| Mr. JOPL | Developer | |
| Mr. Kitkat | Developer | |
| Mr. Metal Alex | Developer | |
| Mr. Micro | DeveloperPublisher | |