Series
- Madam of Espionage
- Magic: The Gathering
- Marshal Law
- Marvel classic novels
- Marvel novels
- Marvel Original Novel
- Mass Effect
- Matt Helm
- Max Payne
- Memoirs of Lady Trent
- Mick Oberon
- Mike Hammer
- Millarworld
- Modesty Blaise
- Monsters of Verity
- Monsterverse
- Mouse Guard
- Murdoch Mysteries