- Monster of Monsters: Series Two Mortem’s Level 1: #1 Abandoned And Alone
- Monster, Sci-Fi Erotica
- Monsters from Beyond Reality
- Monsters from Beyond Reality 1st Ed.
- Monsters in My Mind
- Monsters in the Attic: Aliens, Terrorists, and One Voluble Raccoon
- Monsters in the Garden
- Monsters in the Woods
- Monsters of Mars
- Monsters of Moyen
- Monsters of the Mind
- Monsters of the Ray
- Monsters, and More
- Monstrous Planet
- Moon
- Moon City
- Moon Crazy
- Moon Deeds: Star Children Saga
- Moon Dreams
- Moon Dust
- Moon Glow
- Moon Jump
- Moon Life
- Moon Men
- Moon Mirror
- Moon of Danger and two more stories
- Moon of Odysseus
- Moon Shot
- Moon Trip
- Moon's Odyssey
- Moondrive
- MoonDust
- Moondust Memories
- MoonFall
- Moonfall
- MoonFire
- Moonflaw
- Moonfur And Other Tales
- Moonkind
- Moonlight
- MoonLit Bay
- Moonlit Wings
- Moonrise
- MoonRise
- Moons of New Saturn
- Moons of Solisticia
- Moons of Solisticia
- Moons' Kiss
- Moonscape
- Moonscape Box Set
- Moonshaker
- Moonshot
- Moonstroke
- Moonstroke II, Alien Territory
- Moonwar
- Moore or Less
- Mootoa’S Moons
- Mop Jockeys and Fighter Pilots
- Mop-Head
- Moradores de la Luna
- Moral and Orbital Decay
- Moral Killing
- Morango, L'altra faccia dei Lunatici
- Mordecai as Recorded
- More Deceptive Visions
- More Fantastic Stories
- More from the Other Side of the Holy Bible
- More Human Than Human
- More Portals
- More Short Stories to Read on a Bus, a Car, a Train, a Plane (or a comfy chair anywhere)
- More than Human: The Mensa Contagion
- More Than Magick
- More Than Stardust
- More Than the Sum of His Parts
- More Than Words Volume 4
- More Than Words: Acts of Kindness
- More Than Words: Stories of Hope
- More Things I Could Get Out of My Mind
- More Things in Heaven
- More Zion's Fiction
- More, And Yet Still Even More Things I Could Get Out of My Mind
- Moreta: Dragonlady of Pern
- Morfirion
- Morgan's Misfits
- Morgengrauen: Ein postapokalyptischer Thriller
- Morgànt dei Nerogatti
- Morire a Italbar (Urania)
- Morning Child and Other Stories
- Morning Presentation
- Morning Star: A Collection of Science Fiction and Fantasy Stories
- Morning Tattoo, Silver Assassin Book Four
- Morning, the Third Day
- Morningside Fall
- MorningStar
- Morph Planet
- Morpheus
- Morphosis
- Mors Prodetores: The Chimera Adjustment: Book Three (Imperium Cicernus 3)
- Mortal Brother
- Mortal Passage
- Mortal Remains
- Mortal Stream of the Undead Sky
- Mortality Revisited
- Mortalità
- Mortals Pray
- Mortanian Rhapsody: Mission 12
- Morte dell'Agglomerato
- Morte di Capitan Futuro
- Morte di un unicorno
- Morte sull'altare
- Mortuis Luna
- Mosaic
- Moscow But Dreaming
- Moscow Gold
- Moses- Book 3
- Moskal
- Most interesting stories of all nations
- Most of Now
- Mostly Harmless
- Motel World of the Dragon
- Mother
- Mother Dreams
- Mother in the Box Factory & Other Insanities
- Mother of Demons
- Mother of Eden
- Mother of Hope
- Mother of Invention
- Mother of Machines: Carbon Sunset
- Mother of Mars
- Mother of Plenty
- Mother of Stars
- Motherbot
- Mothers & Other Monsters
- Mothers Last Child
- Mothership Zeta, Issue 2
- Mount Condour