- Missionary Travels and Researches in South AfricaAuthor: David LivingstoneReleased on Project Gutenberg: February 11, 2006
- Missionary Work Among the Ojebway IndiansAuthor: Edward Francis WilsonReleased on Project Gutenberg: November 1, 2004
- MissyAuthor: Dana GatlinReleased on Project Gutenberg: October 1, 2002
- Mistress and Maid: A Household StoryAuthor: Dinah Maria Mulock CraikReleased on Project Gutenberg: September 15, 2004
- Mistress AnneAuthor: Temple Bailey, F. Vaux (Francis Vaux) WilsonReleased on Project Gutenberg: October 30, 2007
- Mistress MargeryAuthor: Emily Sarah HoltReleased on Project Gutenberg: October 25, 2007
- Mistress PenwickAuthor: Payne, DuttonReleased on Project Gutenberg: May 1, 2004
- Mistress WildingAuthor: Rafael SabatiniReleased on Project Gutenberg: September 1, 1998
- Mitch MillerAuthor: Edgar Lee Masters, John SloanReleased on Project Gutenberg: June 23, 2007
- Mizora: A Prophecy: A MSS. Found Among the Private Papers of the Princess Vera ZarovitchAuthor: Lane, Mary E. BradleyReleased on Project Gutenberg: March 4, 2008
- Mob Rule in New Orleans: Robert Charles and His Fight to Death, the Story of His Life, Burning Human Beings Alive, Other Lynching StatisticsAuthor: Ida B. Wells-BarnettReleased on Project Gutenberg: February 8, 2005
- Mobilizing Woman-PowerAuthor: Harriot Stanton BlatchReleased on Project Gutenberg: November 1, 2003
- Moby Dick; Or, The WhaleAuthor: Herman MelvilleReleased on Project Gutenberg: January 1, 2001
- Moby Dick; Or, The WhaleAuthor: Herman MelvilleReleased on Project Gutenberg: July 1, 2001
- Moby Hyphenation ListAuthor: Grady WardReleased on Project Gutenberg: May 1, 2002
- Moby Multiple Language Lists of Common WordsAuthor: Grady WardReleased on Project Gutenberg: May 1, 2002
- Moby Part of Speech ListAuthor: Grady WardReleased on Project Gutenberg: May 1, 2002
- Moby Pronunciation ListAuthor: Grady WardReleased on Project Gutenberg: May 1, 2002
- Moby Thesaurus ListAuthor: Grady WardReleased on Project Gutenberg: May 1, 2002
- Moby-Dick; or, The WhaleAuthor: Herman MelvilleReleased on Project Gutenberg: May 1, 1991
- Model Speeches for PractiseAuthor: Grenville KleiserReleased on Project Gutenberg: May 6, 2006
- Modern American Prose SelectionsAuthor: Byron J. (Byron Johnson) ReesReleased on Project Gutenberg: November 8, 2006
- Modern Atheism under its forms of Pantheism, Materialism, Secularism, Development, and Natural LawsAuthor: James BuchananReleased on Project Gutenberg: December 31, 2006
- Modern Broods; Or, Developments Unlooked ForAuthor: Charlotte M. (Charlotte Mary) YongeReleased on Project Gutenberg: December 1, 2004
- Modern Eloquence: Vol II, After-Dinner Speeches E-OAuthor: Thomas B. (Thomas Brackett) ReedReleased on Project Gutenberg: July 13, 2006
- Modern Eloquence: Vol III, After-Dinner Speeches P-ZAuthor: Thomas B. (Thomas Brackett) ReedReleased on Project Gutenberg: May 19, 2006
- Modern English Books of PowerAuthor: George Hamlin FitchReleased on Project Gutenberg: September 9, 2006
- Modern FictionAuthor: Charles Dudley WarnerReleased on Project Gutenberg: December 5, 2004
- Modern French Philosophy: a Study of the Development Since ComteAuthor: John Alexander GunnReleased on Project Gutenberg: March 1, 2004
- Modern Icelandic Plays: Eyvind of the Hills; The Hraun FarmAuthor: Jóhann Sigurjónsson, Henninge Margrethe Krohn SchancheReleased on Project Gutenberg: June 25, 2007
- Modern IndiaAuthor: William Eleroy CurtisReleased on Project Gutenberg: February 1, 2004
- Modern Italian Poets; Essays and VersionsAuthor: William Dean HowellsReleased on Project Gutenberg: May 1, 2005
- Modern MythologyAuthor: Andrew LangReleased on Project Gutenberg: January 3, 2005
- Modern PaintingAuthor: George MooreReleased on Project Gutenberg: May 1, 2005
- Modern PersiaAuthor: Mooshie G. DanielReleased on Project Gutenberg: May 17, 2007
- Modern Prose And Poetry; For Secondary Schools: Edited With Notes, Study Helps, And Reading ListsAuthor: Margaret AshmunReleased on Project Gutenberg: November 26, 2005
- Modern Religious Cults and MovementsAuthor: Gaius Glenn AtkinsReleased on Project Gutenberg: August 15, 2006
- Modern Saints and SeersAuthor: Jean Finot, Marrett, Evan [Translator]Released on Project Gutenberg: April 22, 2008
- Modern Skepticism: A Journey Through the Land of Doubt and Back Again: A Life StoryAuthor: Joseph BarkerReleased on Project Gutenberg: June 24, 2006
- Modern Spanish LyricsAuthor: E. C. (Elijah Clarence) Hills, S. Griswold (Sylvanus Griswold) MorleyReleased on Project Gutenberg: June 14, 2005
- Modeste MignonAuthor: Honoré de Balzac, Katharine Prescott WormeleyReleased on Project Gutenberg: October 1, 1998
- Mogens, and Other StoriesAuthor: J. P. (Jens Peter) Jacobsen, Grabow, Anna [Translator]Released on Project Gutenberg: October 1, 2004
- Mohammed Ali and His HouseAuthor: L. (Luise) Mühlbach, Coleman, Chapman, Mrs.Released on Project Gutenberg: July 1, 2002
- Mohammed, The Prophet of IslamAuthor: Hayes, Herbert E. E. (Herbert Edward Elton)Released on Project Gutenberg: November 16, 2004
- Mohammedanism: Lectures on Its Origin, Its Religious and Political Growth, and Its Present StateAuthor: C. (Christiaan) Snouck HurgronjeReleased on Project Gutenberg: November 1, 2003
- Mohun; Or, the Last Days of Lee and His Paladins.: Final Memoirs of a Staff Officer Serving in Virginia. from the Mss. of Colonel Surry, of Eagle's Nest.Author: John Esten CookeReleased on Project Gutenberg: July 1, 2005
- Molly BawnAuthor: DuchessReleased on Project Gutenberg: August 1, 2007
- Molly Brown's Orchard HomeAuthor: Nell Speed, Charles L. (Charles Lewis) WrennReleased on Project Gutenberg: February 19, 2007
- Molly Brown's Senior DaysAuthor: Nell Speed, Charles L. (Charles Lewis) WrennReleased on Project Gutenberg: March 23, 2008
- Molly Make-BelieveAuthor: Eleanor Hallowell Abbott, Walter TittleReleased on Project Gutenberg: June 23, 2006
- Molly McDonald: A Tale of the Old FrontierAuthor: Randall Parrish, E. L. (Ernest Leonard) BlumenscheinReleased on Project Gutenberg: February 18, 2006
- Moments of Vision and Miscellaneous VersesAuthor: Thomas HardyReleased on Project Gutenberg: June 1, 2002
- Mona; Or, The Secret of a Royal MirrorAuthor: Sheldon, Georgie, Mrs.Released on Project Gutenberg: December 23, 2004
- Monarch, the Big Bear of TallacAuthor: Ernest Thompson SetonReleased on Project Gutenberg: February 1, 2004
- Money IslandAuthor: Andrew Jackson HowellReleased on Project Gutenberg: December 30, 2005
- Moni the Goat-BoyAuthor: Johanna Spyri, Charles Copeland, Helen B. DoleReleased on Project Gutenberg: November 1, 2005
- Monism as Connecting Religion and Science: A Man of ScienceAuthor: Ernst HaeckelReleased on Project Gutenberg: October 1, 2005
- Monitress MerleAuthor: Angela BrazilReleased on Project Gutenberg: April 1, 2005
- Monkey Jack and Other StoriesAuthor: Palmer CoxReleased on Project Gutenberg: April 1, 2004
- Monopolies and the PeopleAuthor: Charles Whiting BakerReleased on Project Gutenberg: June 14, 2007