- Mortal Banshee
- Mortal Coils
- Mortal Enemy
- Mortal Engines
- Mortal Engines - Der Grüne Sturm
- Mortal Engines - Die verlorene Stadt
- Mortal Engines - Krieg der Städte
- Mortal Passage
- Mortal Remains
- Mortal Stream of the Undead Sky
- Mortanian Rhapsody: Mission 12
- Morte
- Morte dell'Agglomerato
- Morte di Capitan Futuro
- Mortuis Luna
- Mort™
- Moscow Gold
- Moses Garrett
- Mostly Harmless
- Mostly Human
- Mot slocknande solar
- Mother Grimm
- Mother of Darkness
- Mother of Kings
- Mother of Stars
- Mother Savant
- Mother Warm
- Motherbot
- Motherlines
- Motherload
- Mothers Last Child
- Motor City Alien Mail Order Brides Collection
- Mountain of Black Glass
- Mountain of Death: An Agent of The Emperor Science Fiction Short Story
- Mourner
- Mouse and Dragon
- Mouse of Mu 3
- Movers, Inc.
- Moving Targets
- Moxon's Master
- Moxon's Master - and other Tales of Murder Most Foul
- Moxyland
- Możemy cię zbudować
- Mr Armageddon
- Mr Tok
- Mr. Adam
- Mr. and Mrs. Saturday Night
- Mr. Ben's Rail Road
- Mr. Britling Sees It Through — Publix Press
- Mr. Chipfellow’s Jackpot
- Mr. Darwin's Dragon
- Mr. Dead Eyes
- Mr. Gunn and Dr. Bohemia
- Mr. Murder
- Mr. Neboc
- Mr. Pakool's Spice
- Mr. Spaceman
- Mr. Spaceship
- Mr. Stranger's Sealed Packet
- Mr. Triple-B
- Mrs Caliban (Faber Editions)
- Mrs. Claus: Not the Fairy Tale They Say
- Mrówańcza
- Ms Patriot: No Holds Barred
- Ms. Anna the Promise Keeper
- Mt. Moulamein
- MTT
- Mud and Brass
- Muero por dentro
- Muezzinland: the author’s edition
- Mule Creek Landslide: A Thunder Mountain Story
- Multigalactic Macedonian
- Multiplarity
- Multiples
- MultiReal
- Multispecies Cities
- Multiversal Truth: Mission 8
- Multiverse: Exploring the Worlds of Poul Anderson
- Multiverso Pulp: ópera espacial
- Multiversum - Die Rückkehr
- Mumbai Manhunt
- Mundane Moon Maze
- Mundo Anillo
- Mundos
- Mundos distantes
- Mundos en expansión
- Mundos en la Eternidad
- Mundos y demonios
- Munnen med tusen tungor
- Murder at Holyrood Palace
- Murder Game
- Murder in the Void
- Murder Madness
- Murder on Marawa prime
- Murder Madness
- Murder on Marawa prime
- Murder on the Ice Floe in Nashville
- Murder on the Titania and Other Steam-Powered Adventures
- Murder on the Zenith Express
- Murder Park
- Murderville
- Muriel
- Murmullos de Inteligencia
- Museion
- Muses of Roma
- Muses of Terra
- Muses of the Republic
- Music of the Spheres
- Musical Trouble
- Musings and Meditations
- Musk on Mars
- Musketeer Space
- Must Love Breeches (A Time Travel Romance)
- Must Love Chainmail (A Time Travel Romance)
- Must Love Kilts (A Time Travel Romance)
- Must Love More Kilts (A Time Travel Romance)
- Mutant
- Mutant 59
- Mutant Blue Eden
- Mutant Chronicles
- Mutant Legacy
- Mutant Star
- Mutated
- Mutation Z Series: Books 1-3
- Mutation Z Series: Books 1-6
- Mutation Z Series: Books 4-6
- Mutation Z: Closing the Borders
- Mutation Z: Desperate Measures
- Mutation Z: Dragon in the Bunker
- Mutation Z: Drones Overhead
- Mutation Z: Protecting Our Own
- Mutation Z: The Ebola Zombies
- Muted and She
- Mutineer's Moon
- Mutiny on the Moonbeam
- Mutiny: Episode 1
- Muturi Deception
- My
- My Alien King
- My Alien Warrior: A Sci-Fi Alien Warrior Paranormal Romance