Group
- Mesa Mundi Inc.18
- Metalhead Minis12
- Mid-Hudson Gaming Geeks3
- Mid-World Arts4
- Midwest Research II1
- Mind's Eye Society2
- Minion Games4
- Mirror Box Games11
- Misdirected Mark Productions1
- Miskatonic Alumni Association1
- Mogchelle4
- MomentumVolsk2
- Monkeyfun Studios2
- Monte Cook Games76
- Moon Design Publications13
- Mr. B. Games21
- Mr. B. Games/ L4 Studios3
- Mutha Oith Creations8
- Myrmidon Design Bureau7
- Mythical Eras of War, Games, LLC.37