- The Moral EconomyAuthor: Ralph Barton PerryReleased on Project Gutenberg: July 24, 2007
- The Moral Picture BookAuthor: AnonymousReleased on Project Gutenberg: August 31, 2004
- The Morals of Marcus Ordeyne : a NovelAuthor: William John LockeReleased on Project Gutenberg: February 1, 2004
- The Moravians in Georgia, 1735-1740Author: Adelaide L. (Adelaide Lisetta) FriesReleased on Project Gutenberg: June 1, 1996
- The Moravians in LabradorAuthor: AnonymousReleased on Project Gutenberg: May 14, 2006
- The Morgesons: A NovelAuthor: Elizabeth StoddardReleased on Project Gutenberg: May 1, 2004
- The Mormon Menace: The Confessions of John Doyle Lee, DaniteAuthor: John Doyle Lee, Alfred Henry LewisReleased on Project Gutenberg: November 17, 2007
- The Mormon ProphetAuthor: L. (Lily) DougallReleased on Project Gutenberg: December 11, 2005
- The Morris Book, Part 1: A History of Morris Dancing, With a Description of Eleven Dances as Performed by the Morris-Men of EnglandAuthor: Cecil J. (Cecil James) Sharp, MacIlwaine, Herbert C.Released on Project Gutenberg: July 17, 2004
- The Most Ancient Lives of Saint Patrick: Including the Life by Jocelin, Hitherto Unpublished in America, and His Extant WritingsAuthor: O'Leary, James [Editor]Released on Project Gutenberg: June 1, 2006
- The Mother and Her ChildAuthor: William S. (William Samuel) Sadler, Lena K. (Lena Kellogg) SadlerReleased on Project Gutenberg: March 14, 2007
- The Mother's Recompense, Volume 1: A Sequel to Home InfluenceAuthor: Grace AguilarReleased on Project Gutenberg: May 1, 2004
- The Mother's Recompense, Volume 2: A Sequel to Home InfluenceAuthor: Grace AguilarReleased on Project Gutenberg: May 1, 2004
- The Mothers Of Honoré: From "Mackinac And Lake Stories", 1899Author: Mary Hartwell CatherwoodReleased on Project Gutenberg: October 30, 2007
- The Motor Boys on the Pacific; Or, the Young Derelict HuntersAuthor: Young, ClarenceReleased on Project Gutenberg: February 1, 2004
- The Motor Car Dumpy BookAuthor: T. W. H. (Thomas William Hodgson) Crosland, Monsell, J. R. [Illustrator]Released on Project Gutenberg: February 14, 2008
- The Motor GirlsAuthor: Penrose, MargaretReleased on Project Gutenberg: January 1, 2004
- The Motor Girls on a TourAuthor: Penrose, MargaretReleased on Project Gutenberg: August 1, 2001
- The Motor Girls on Cedar Lake; Or, the Hermit of Fern IslandAuthor: Penrose, MargaretReleased on Project Gutenberg: December 1, 2004
- The Motor Girls on Crystal Bay; or, The Secret of the Red OarAuthor: Penrose, MargaretReleased on Project Gutenberg: June 22, 2008
- The Motor Girls on Waters Blue; Or, the Strange Cruise of the TartarAuthor: Penrose, MargaretReleased on Project Gutenberg: January 1, 2005
- The Motor Girls Through New England; or, Held by the GypsiesAuthor: Penrose, MargaretReleased on Project Gutenberg: March 22, 2007
- The Motor MaidAuthor: C. N. (Charles Norris) Williamson, A. M. (Alice Muriel) WilliamsonReleased on Project Gutenberg: December 17, 2005
- The Motor Maids at Sunrise CampAuthor: Stokes, KatherineReleased on Project Gutenberg: November 28, 2007
- The Motor Maids in Fair JapanAuthor: Stokes, KatherineReleased on Project Gutenberg: September 13, 2004
- The MotormaniacsAuthor: Lloyd OsbourneReleased on Project Gutenberg: May 1, 2004
- The Mound BuildersAuthor: George BryceReleased on Project Gutenberg: March 15, 2006
- The Mountain Chant, A Navajo Ceremony: Fifth Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1883-84, Government Printing Office, Washington, 1887, pages 379-468Author: Washington MatthewsReleased on Project Gutenberg: March 17, 2007
- The Mountain Spring, and Other PoemsAuthor: Nancy Rebecca Campbell GlassReleased on Project Gutenberg: February 18, 2005
- The Mountain that was 'God': Being a Little Book About the Great Peak Which the Indians Named 'Tacoma' but Which is Officially Called 'Rainier'Author: John H. (John Harvey) WilliamsReleased on Project Gutenberg: July 12, 2007
- The MountainsAuthor: Stewart Edward WhiteReleased on Project Gutenberg: March 1, 1996
- The Mountains of CaliforniaAuthor: John MuirReleased on Project Gutenberg: November 1, 2003
- The MountebankAuthor: William John LockeReleased on Project Gutenberg: July 1, 2005
- The Movements and Habits of Climbing PlantsAuthor: Charles DarwinReleased on Project Gutenberg: January 1, 2001
- The Moving FingerAuthor: Mary GauntReleased on Project Gutenberg: May 5, 2007
- The moving picture boys at PanamaAuthor: Appleton, VictorReleased on Project Gutenberg: January 1, 2004
- The moving picture boys on the coastAuthor: Appleton, VictorReleased on Project Gutenberg: December 2, 2007
- The moving picture boys on the war frontAuthor: Appleton, VictorReleased on Project Gutenberg: February 10, 2006
- The Moving Picture Girls at Oak Farm: or, Queer Happenings While Taking Rural PlaysAuthor: Hope, Laura LeeReleased on Project Gutenberg: November 29, 2006
- The Moving Picture Girls at Rocky Ranch: Or, Great Days Among the CowboysAuthor: Hope, Laura LeeReleased on Project Gutenberg: January 12, 2007
- The Moving Picture Girls at Sea: or, A Pictured Shipwreck That Became RealAuthor: Hope, Laura LeeReleased on Project Gutenberg: June 27, 2006
- The Moving Picture Girls in War Plays: Or, The Sham Battles at Oak FarmAuthor: Hope, Laura LeeReleased on Project Gutenberg: January 12, 2007
- The Moving Picture Girls Snowbound: Or, The Proof on the FilmAuthor: Hope, Laura LeeReleased on Project Gutenberg: January 12, 2007
- The Moving Picture Girls Under the Palms: Or Lost in the Wilds of FloridaAuthor: Hope, Laura LeeReleased on Project Gutenberg: November 20, 2005
- The Moving Picture Girls; Or, First Appearances in Photo DramasAuthor: Hope, Laura LeeReleased on Project Gutenberg: September 4, 2006
- The MuckerAuthor: Edgar Rice BurroughsReleased on Project Gutenberg: September 1, 1995
- The mule-boneAuthor: Langston Hughes, Zora Neale HurstonReleased on Project Gutenberg: October 2, 2006
- The Mule: A Treatise on the Breeding, Training, and Uses to Which He May Be PutAuthor: Riley, HarveyReleased on Project Gutenberg: January 1, 2004
- The mummy and Miss Nitocris : a phantasy of the fourth dimensionAuthor: George Chetwynd GriffithReleased on Project Gutenberg: September 10, 2006
- The Mummy's FootAuthor: Théophile Gautier, Lafcadio HearnReleased on Project Gutenberg: September 18, 2007
- The Muse of the DepartmentAuthor: Honoré de Balzac, Waring, James [Translator]Released on Project Gutenberg: October 1, 1999
- The Music Master; Novelized from the PlayAuthor: Charles KleinReleased on Project Gutenberg: November 24, 2007
- The Mutineers: A Tale of Old Days at Sea and of Adventures in the Far East as Benjamin Lathrop Set It Down Some Sixty Years AgoAuthor: Charles Boardman HawesReleased on Project Gutenberg: January 1, 2006
- The Mutiny of the ElsinoreAuthor: Jack LondonReleased on Project Gutenberg: December 1, 2000
- The Mysteries of All Nations: Rise and Progress of Superstition, Laws Against and Trials of Witches, Ancient and Modern Delusions Together with Strange Customs, Fables, and TalesAuthor: Grant, James (Archaeologist)Released on Project Gutenberg: November 23, 2006
- The Mysteries of Free Masonry: Containing All the Degrees of the Order Conferred in a Master's LodgeAuthor: William MorganReleased on Project Gutenberg: April 9, 2006
- The Mysteries of Montreal: Being Recollections of a Female PhysicianAuthor: Ch. (Charlotte) FührerReleased on Project Gutenberg: July 1, 2005
- The Mysteries of UdolphoAuthor: Ann Ward RadcliffeReleased on Project Gutenberg: June 1, 2002
- The Mysterious Affair at StylesAuthor: Agatha ChristieReleased on Project Gutenberg: March 1, 1997
- The Mysterious IslandAuthor: Jules Verne, Agnes Kinloch KingstonReleased on Project Gutenberg: April 1, 1998