Group
- Mesa Mundi23
- Metalhead Minis7
- Metalhead Minis 4
- Michael Southers1
- Midnight Campaign Games25
- Midwest Research II2
- Mike Becnel Games2
- Mind's Eye Society2
- Mindworm Games12
- Minion Games15
- Mirror Box Games16
- Misdirected Awesome Games7
- Misdirected Mark Productions and Encoded Designs1
- Miskatonic Alumni Association/Chaosium1
- Mithrilpunk Press7
- Modiphius Entertainment1
- Mogchelle Cosplay8
- Monolith17
- Monte Cook Games, LLC67
- Morning2