- The Man Who Knew Too MuchAuthor: G. K. (Gilbert Keith) ChestertonReleased on Project Gutenberg: April 1, 1999
- The Man Who Laughs: A Romance of English HistoryAuthor: Victor HugoReleased on Project Gutenberg: June 1, 2004
- The Man Who Lost HimselfAuthor: H. De Vere (Henry De Vere) StacpooleReleased on Project Gutenberg: December 23, 2007
- The Man Who Rocked the EarthAuthor: Arthur Cheney Train, Robert Williams WoodReleased on Project Gutenberg: September 4, 2006
- The Man Who Stole A Meeting-House: 1878, From "Coupon Bonds"Author: J. T. (John Townsend) TrowbridgeReleased on Project Gutenberg: October 24, 2007
- The Man Who Was AfraidAuthor: Maksim Gorky, Herman BernsteinReleased on Project Gutenberg: July 1, 2001
- The Man Who Was Thursday: A NightmareAuthor: G. K. (Gilbert Keith) ChestertonReleased on Project Gutenberg: April 1, 1999
- The Man Who Would Be KingAuthor: Rudyard KiplingReleased on Project Gutenberg: May 1, 2005
- The Man Whom the Trees LovedAuthor: Algernon BlackwoodReleased on Project Gutenberg: February 1, 2004
- The man with the broken earAuthor: Edmond About, Henry HoltReleased on Project Gutenberg: March 2, 2007
- The Man with the ClubfootAuthor: Valentine WilliamsReleased on Project Gutenberg: March 9, 2005
- The Man with Two Left Feet, and Other StoriesAuthor: P. G. (Pelham Grenville) WodehouseReleased on Project Gutenberg: February 1, 2005
- The Man Without a CountryAuthor: Edward Everett HaleReleased on Project Gutenberg: August 8, 2005
- The Man Without a Country, and Other TalesAuthor: Edward Everett HaleReleased on Project Gutenberg: May 20, 2005
- The Man-Eaters of Tsavo, and Other East African AdventuresAuthor: J. H. (John Henry) Patterson, Frederick Courteney SelousReleased on Project Gutenberg: March 1, 2003
- The Man-Made World; Or, Our Androcentric CultureAuthor: Charlotte Perkins GilmanReleased on Project Gutenberg: January 1, 2002
- The Man-Wolf and Other TalesAuthor: Erckmann-ChatrianReleased on Project Gutenberg: May 2, 2005
- The Manor House of Lacolle: A description and historical sketch of the Manoir of the Seigniory: of de Beaujeu of LacolleAuthor: W. D. (William Douw) LighthallReleased on Project Gutenberg: January 31, 2005
- The MansionAuthor: Henry Van DykeReleased on Project Gutenberg: October 1, 1996
- The Mansion of Mystery: Being a Certain Case of Importance, Taken from the Note-book of Adam Adams, Investigator and DetectiveAuthor: Steele, Chester K.Released on Project Gutenberg: July 4, 2005
- The MantoothAuthor: Leadem, ChristopherReleased on Project Gutenberg: December 26, 2005
- The Manual of Heraldry; Fifth Edition: Being a Concise Description of the Several Terms Used, and Containing a Dictionary of Every Designation in the ScienceAuthor: AnonymousReleased on Project Gutenberg: July 12, 2005
- The Manxman : a novelAuthor: Caine, Hall, SirReleased on Project Gutenberg: May 23, 2008
- The Manóbos of Mindanáo: Memoirs of the National Academy of Sciences, Volume XXIII, First MemoirAuthor: Garvan, John M.Released on Project Gutenberg: June 16, 2006
- The Marble Faun; Or, The Romance of Monte Beni - Volume 1Author: Nathaniel HawthorneReleased on Project Gutenberg: February 26, 2006
- The Marble Faun; Or, The Romance of Monte Beni - Volume 2Author: Nathaniel HawthorneReleased on Project Gutenberg: February 26, 2006
- The March of Portola and the Discovery of the Bay of San FranciscoAuthor: Zoeth Skinner Eldredge, Molera, E. J. (Eusebius Joseph)Released on Project Gutenberg: January 1, 2004
- The March of the White GuardAuthor: Gilbert ParkerReleased on Project Gutenberg: November 17, 2004
- The Mariner of St. Malo : A chronicle of the voyages of Jacques CartierAuthor: Stephen Leacock, H. H. (Hugh Hornby) Langton, George McKinnon WrongReleased on Project Gutenberg: May 1, 2003
- The Mark of CainAuthor: Andrew LangReleased on Project Gutenberg: June 12, 2007
- The Mark of the BeastAuthor: Watson, SydneyReleased on Project Gutenberg: July 13, 2006
- The Market-PlaceAuthor: Harold FredericReleased on Project Gutenberg: July 9, 2008
- The MaroonerAuthor: Stearns, Charles A., Leo SummersReleased on Project Gutenberg: March 9, 2008
- The Marquis of LossieAuthor: George MacDonaldReleased on Project Gutenberg: December 1, 2004
- The Marriage ContractAuthor: Honoré de Balzac, Katharine Prescott WormeleyReleased on Project Gutenberg: March 12, 2005
- The Marriage of William AsheAuthor: Ward, Humphry, Mrs., Albert SternerReleased on Project Gutenberg: November 22, 2004
- The MarriagesAuthor: Henry JamesReleased on Project Gutenberg: December 1, 2000
- The Marrow of TraditionAuthor: Charles W. (Charles Waddell) ChesnuttReleased on Project Gutenberg: February 1, 2004
- The Martial Adventures of Henry and MeAuthor: William Allen WhiteReleased on Project Gutenberg: May 1, 2004
- The Martin Luther King, Jr. Day, 1995, Memorial IssueAuthor: VariousReleased on Project Gutenberg: June 29, 2008
- The martyr of the catacombsAuthor: James De MilleReleased on Project Gutenberg: February 23, 2008
- The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and KeplerAuthor: David BrewsterReleased on Project Gutenberg: July 7, 2008
- The Marvelous Exploits of Paul Bunyan: As Told in the Camps of the White Pine Lumbermen for Generations During Which Time the Loggers Have Pioneered the Way Through the North Woods From Maine to California. Collected from Various Sources and Embellished for PublicationAuthor: William B. LaugheadReleased on Project Gutenberg: May 1, 2004
- The Marvelous Land of OzAuthor: L. Frank (Lyman Frank) Baum, John R. (John Rea) NeillReleased on Project Gutenberg: February 1, 1993
- The Marx He KnewAuthor: John SpargoReleased on Project Gutenberg: March 4, 2007
- The Mascot of Sweet Briar GulchAuthor: Henry Wallace Phillips, F. Graham (Frank Graham) CootesReleased on Project Gutenberg: June 16, 2008
- The Mask: A Story of Love and AdventureAuthor: Arthur Hornblow, Paul StahrReleased on Project Gutenberg: December 18, 2006
- The Mason-BeesAuthor: Jean-Henri Fabre, Alexander Teixeira de MattosReleased on Project Gutenberg: October 1, 2001
- The Masque of the Red DeathAuthor: Edgar Allan PoeReleased on Project Gutenberg: June 6, 2010
- The MasqueraderAuthor: Katherine Cecil ThurstonReleased on Project Gutenberg: April 1, 2004
- The Masques of OttawaAuthor: Augustus BridleReleased on Project Gutenberg: April 2, 2007
- The Master BuilderAuthor: Henrik Ibsen, William Archer, Edmund GosseReleased on Project Gutenberg: May 1, 2003
- The Master Detective: Being Some Further Investigations of Christopher QuarlesAuthor: Percy James BrebnerReleased on Project Gutenberg: January 1, 2006
- The Master Key: An Electrical Fairy Tale Founded Upon the Mysteries of ElectricityAuthor: L. Frank (Lyman Frank) BaumReleased on Project Gutenberg: February 1, 1996
- The Master MysteryAuthor: Arthur B. (Arthur Benjamin) Reeve, Grey, John W.Released on Project Gutenberg: July 1, 2005
- The Master of Appleby: A Novel Tale Concerning Itself in Part with the Great Struggle in the Two Carolinas; but Chiefly with the Adventures Therein of Two Gentlemen Who Loved One and the Same LadyAuthor: Francis Lynde, Thure de ThulstrupReleased on Project Gutenberg: February 6, 2006
- The Master of Ballantrae: A Winter's TaleAuthor: Robert Louis StevensonReleased on Project Gutenberg: March 1, 1997
- The Master of Mrs. Chilvers: An Improbable ComedyAuthor: Jerome K. (Jerome Klapka) JeromeReleased on Project Gutenberg: May 1, 2000
- The Master of Silence: A RomanceAuthor: Irving BachellerReleased on Project Gutenberg: February 1, 2005
- The Master of the ShellAuthor: Talbot Baines ReedReleased on Project Gutenberg: April 12, 2007