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- Macroscope by Piers Anthony
- Mad Empress of Callisto by Lin Carter
- Majipoor series by Robert Silverberg
- namely, Lord Valentine's Castle, Valentine Pontifex, Majipoor Chronicles; there are more but of debated quality
- Make Room! Make Room! by Harry Harrison
- The Malacia Tapestry by Brian W. Aldiss
- Man Plus by Frederik Pohl
- Man in a Cage by Brian Stableford
- The Man in the High Castle by Philip K. Dick
- The Man Who Fell to Earth by Walter Tevis
- The Man Who Folded Himself by David Gerrold
- The Martian Chronicles by Ray Bradbury
- Maske: Thaery by Jack Vance
- The Master by T. H. White
- Masters of Time by A. E. van Vogt
- A Maze of Death by Philip K. Dick
- Meendum Jeano by Sujatha Rangarajan
- A Meeting at Corvallis by S. M. Stirling
- Mellonta Taunta by Edgar Allan Poe
- The Memory of Earth by Orson Scott Card
- also The Call of Earth, The Ships of Earth, Earthfall, Earthborn
- The Merchant and the Alchemist's Gate by Ted Chiang
- The Midnight Dancers by Gerard F. Conway
- Midshipman's Hope by David Feintuch
- see the Seafort Saga for its sequels
- The Midwich Cuckoos by John Wyndham
- A Million Open Doors by John Barnes
- Mind of My Mind by Octavia Butler
- The Mind Riders by Brian Stableford
- The Mind Cage by A. E. van Vogt
- Mind Wizards of Callisto by Lin Carter
- Mirabile by Janet Kagan
- Mission Earth by L. Ron Hubbard
- Mission of Gravity by Hal Clement
- Mists of Dawn by Chad Oliver
- The Moat Around Murcheson's Eye by Larry Niven and Jerry Pournelle. This was the United Kingdom title, elsewhere it's known as The Gripping Hand
- The Modular Man by Roger MacBride Allen, Essay by Isaac Asimov
- Mona Lisa Overdrive by William Gibson
- Moon Base One by Hugh Walters
- The Moon Is a Harsh Mistress by Robert A. Heinlein
- More Than Human by Theodore Sturgeon
- The Morgaine Stories by C. J. Cherryh
- namely, Gate of Ivrel, Well of Shiuan, Fires of Azeroth, and Exile's Gate
- Mostly Harmless by Douglas Adams
- The Mote in God's Eye by Larry Niven and Jerry Pournelle
- Mountains Oceans and Giants by Alfred Döblin
- Mr. Justice by Doris Piserchia
- The Mummy! - A Tale of the Twenty-Second Century by J. Webb
- Mythago Wood series by Robert Holdstock
- namely, Mythago Wood, Lavondyss, The Bone Forest, The Hollowing, Merlin's Wood, and Gate of Ivory, Gate of Horn
Read more about this topic: List Of Science Fiction Novels