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- M.E.K. Games - Card games
- M.S. Kinney - Role-playing games
- Maelstrom Hobby - Role-playing games
- Magnificent Egos - Miniatures and Role-playing accessories
- Majestic Twelve Games - Board and card games
- Majora - Toys and board games
- Maldón - Board games
- Malhavoc Press - Role-playing accessories
- Manticore Productions - Role-playing games
- Manzakk Publishing - Adventure Gaming Magazine
- Margaret Weis Productions, Ltd - Role-playing games
- Marischal Adventures - Role-playing games
- Marquee Press - Role-playing games
- Martian Game Modules - Role-playing accessories
- Masquerade Games - Board games and card games
- Matrix Games - Wargames
- Matthews-Simmons Marketing/GamesQuarterly Catalog - Casino supplies
- Mayfair Games - Board and role-playing games
- McArthur Games - Board games and wargames
- McFarlane Toys - Miniatures
- McLoughlin Brothers - Board games
- McNeill Designs for Brighter Minds - Social/Stimulating games
- McNutty Games - Card games
- Mega Miniatures - Miniatures
- Megaton Games - Role-playing games, board games and computer games
- Mego Corporation - Board and card games in addition to action-figure type toys, now defunct
- Melbourne House - Wargames
- Memento Mori Theatricks - Role-playing games
- Meramic Enterprises - Wargames and miniatures
- Merillian - Board games
- Mesomorph Games - Board games
- Metagaming Concepts - Board and role-playing games
- Metaversal Studios - Board and card games
- Metropolis - Role-playing games
- Microgame Design Group - Wargames
- Milton Bradley Company - Board games
- Minden Games - Board games
- Miniature GameWorks - Miniatures and accessories
- MiniaturePlanet - Printed / downloadable texture sheets for miniatures
- Miniature World Maker - Miniatures accessories
- Minifigs - Miniatures
- Mind Storm Labs - Role-playing games
- Miscellaneous Miniatures - Miniatures
- Misguided Games - Role-playing games
- Misfit Studios - Role-playing games
- MJS Creations Game Design & Manufacturing Services - For-hire board and card game manufacturing
- Mobius Games - Role-playing games
- Moments in History - Board games and wargames
- Monkey God Enterprises - Role-playing accessories
- Monday Knight Productions
- Mongoose Publishing - Role-playing games and accessories, miniatures games
- MonkeyGod Enterprises - Role-playing accessories
- Monte Cook - Role-playing accessories
- Moon Design Publications - Role-playing games
- Morbidgames - Role-playing games and fiction
- Mudpuppy Games - Miniatures games
- Multi-Man Publishing - Wargames
- Multisim Publishing - Role-playing games
- Musket Miniatures LLC - Miniatures
- MYNDzei Games - Card games
- Mynstrel's Song Productions - Role-playing games
- Myriador Ltd - Role-playing games
- Myrmidon Press - Role-playing and board games
- Mystic Eye Games - Role-playing accessories
- Mystic Moldwyrks - Role-playing accessories
- Mystic Station Designs - Role-playing accessories
- Mythic Dreams Studios - Role-playing accessories
- MythIntentions, LLC - Collector card games
- Mythrole Games - Board games and role-playing accessories
Read more about this topic: List Of Game Manufacturers