Books in Science Fiction (sorted alphabetically)
- Mightiest Man Patrick Fahy
- Millennium Everett B. Cole
- Mind Digger Winston K. Marks
- Mind Master Arthur J. Burks
- Ministry of Disturbance H. Beam Piper
- Minor Detail Jack Sharkey
- Misplaced Battleship Harry Harrison
- Missing Link Frank Herbert
- Mississippi Saucer Frank Belknap Long
- Miss Ludington's Sister Edward Bellamy
- Mixture of Genius Arnold Castle
- Mizora: A Prophecy Mary E. Bradley Lane
- Modus Vivendi John Berryman
- Moment of Truth Basil Wells
- Monkey On His Back Charles V. De Vet
- Monster S. M. Tenneshaw
- Monster Men Edgar Rice Burroughs
- Monster Men Edgar Rice Burroughs
- Moon Destroyers Monroe K. Ruch
- Moon is Green Fritz Leiber
- Moon Metal Garrett Putman Serviss
- Moon Pool Abraham Merritt
- Moons of Mars Dean Evans
- Moon-Voyage Jules Verne
- Morale: A Story of the War of 1941-43 Murray Leinster