Group
- Manufactured Myth & Legerdemain6
- Marc Gunn15
- Marcotte Music, LLC8
- Marcus (Sabbat) Glowczak7
- Margaret Catter Dev TV1
- Margaret Catter TV1
- Margaret Weis1
- Margaret Weis Productions75
- Margaret Weis Productions, Ltd.109
- Mariucci J. Designs, LLC10
- Mark Sellmeyer3
- Mark Suter and Steve Isaacs1
- Marnicures1
- Mary Broussard1
- Mary Crowell1
- Masquerade Games, LLC2
- Mass Effect: Adventum1
- Massif Games1
- Mastermind Models and Miniatures11
- Masters of GM-Fu1