Group
- Mongoose Publishing/WildFire12
- Monkey Business Institute6
- Monkey House Games2
- Monkeyfun Studios9
- Monocle Society58
- Monolith17
- Monroe County Public Library1
- Monster Adventure Terrain48
- Monster Game Night18
- Monte Cook2
- Monte Cook Games129
- Monte Cook Games, LLC576
- Montgomery Bell Academy1
- Montinelle Press1
- Moon Design Publications37
- Moon Rock Games2
- Moonisland Factory3
- Moonlit Moor Games2
- Moonrat Conspiracy10
- Moonrat Media1