- Matisse Picasso and Gertrude Stein: With Two Shorter StoriesAuthor: Gertrude SteinReleased on Project Gutenberg: April 11, 2005
- Matrimonial Openings: Sailor's Knots, Part 5.Author: W. W. (William Wymark) Jacobs, Will OwenReleased on Project Gutenberg: January 1, 2004
- Matthew ArnoldAuthor: George SaintsburyReleased on Project Gutenberg: July 13, 2005
- Matthew ArnoldAuthor: George William Erskine RussellReleased on Project Gutenberg: September 25, 2005
- Matthew Arnold's Sohrab and Rustum, and other poemsAuthor: Matthew Arnold, Justus Collins CastlemanReleased on Project Gutenberg: September 3, 2004
- MaupratAuthor: George Sand, Young, Stanley [Translator]Released on Project Gutenberg: March 26, 2006
- Maurice GuestAuthor: Henry Handel RichardsonReleased on Project Gutenberg: February 1, 2003
- Maurine and Other PoemsAuthor: Ella Wheeler WilcoxReleased on Project Gutenberg: January 1, 2003
- MavericksAuthor: William MacLeod Raine, Clarence RoweReleased on Project Gutenberg: December 29, 2004
- Maw's Vacation: The Story of a Human Being in the YellowstoneAuthor: Emerson HoughReleased on Project Gutenberg: January 2, 2008
- MaxAuthor: Katherine Cecil Thurston, Frank CraigReleased on Project Gutenberg: November 15, 2004
- Maxim GorkiAuthor: Hans Ostwald, Frances A. (Frances Alice) WelbyReleased on Project Gutenberg: July 10, 2007
- Maximilian in Mexico: A Woman's Reminiscences of the French Intervention 1862-1867Author: Sara Yorke StevensonReleased on Project Gutenberg: June 1, 2004
- Maxims and Opinions of Field-Marshal His Grace the Duke of Wellington, Selected From His Writings and Speeches During a Public Life of More Than Half a CenturyAuthor: Wellington, Arthur Wellesley, Duke of, Francis, George HenryReleased on Project Gutenberg: March 4, 2005
- Maxims for RevolutionistsAuthor: Bernard ShawReleased on Project Gutenberg: July 22, 2008
- May BrookeAuthor: Anna Hanson DorseyReleased on Project Gutenberg: October 18, 2005
- May Day with the MusesAuthor: Robert BloomfieldReleased on Project Gutenberg: October 1, 2005
- May-Day, and Other PiecesAuthor: Ralph Waldo EmersonReleased on Project Gutenberg: May 31, 2005
- Mayfair, Belgravia, and BayswaterAuthor: G. E. (Geraldine Edith) Mitton, Walter BesantReleased on Project Gutenberg: April 26, 2007
- Mazelli, and Other PoemsAuthor: Sands, George W.Released on Project Gutenberg: December 1, 1999
- McClure's Magazine December, 1895Author: Ida M. (Ida Minerva) TarbellReleased on Project Gutenberg: May 1, 2004
- McClure's Magazine, Vol. 31, No. 1, May 1908Author: VariousReleased on Project Gutenberg: February 2, 2006
- McClure's Magazine, Vol. 6, No. 2, January, 1896Author: VariousReleased on Project Gutenberg: October 5, 2004
- McClure's Magazine, Vol. 6, No. 3, February 1896Author: VariousReleased on Project Gutenberg: October 18, 2004
- McClure's Magazine, Vol. 6, No. 4, March, 1896Author: VariousReleased on Project Gutenberg: December 10, 2004
- McClure's Magazine, Vol. 6, No. 5, April, 1896Author: VariousReleased on Project Gutenberg: January 11, 2005
- McClure's Magazine, Vol. 6, No. 6, May, 1896Author: VariousReleased on Project Gutenberg: August 27, 2004
- McGuffey's Eclectic Primer, Revised EditionAuthor: William Holmes McGuffeyReleased on Project Gutenberg: June 29, 2005
- McGuffey's Eclectic Spelling BookAuthor: Alexander H. (Alexander Hamilton) McGuffeyReleased on Project Gutenberg: March 24, 2005
- McGuffey's Fifth Eclectic ReaderAuthor: William Holmes McGuffeyReleased on Project Gutenberg: February 14, 2005
- McGuffey's First Eclectic Reader, Revised EditionAuthor: William Holmes McGuffeyReleased on Project Gutenberg: June 29, 2005
- McGuffey's Fourth Eclectic ReaderAuthor: William Holmes McGuffeyReleased on Project Gutenberg: February 2, 2005
- McGuffey's Second Eclectic ReaderAuthor: William Holmes McGuffeyReleased on Project Gutenberg: June 29, 2005
- McGuffey's Sixth Eclectic ReaderAuthor: William Holmes McGuffeyReleased on Project Gutenberg: September 26, 2005
- McGuffey's Third Eclectic ReaderAuthor: William Holmes McGuffeyReleased on Project Gutenberg: January 23, 2005
- McKinlay's Journal of Exploration in the Interior of AustraliaAuthor: John McKinlayReleased on Project Gutenberg: August 22, 2004
- McTeague: A Story of San FranciscoAuthor: Frank NorrisReleased on Project Gutenberg: March 12, 2006
- Meadow Grass: Tales of New England LifeAuthor: Alice BrownReleased on Project Gutenberg: November 1, 2005
- MeaslesAuthor: William Colby RuckerReleased on Project Gutenberg: November 29, 2006
- Measure for a LonerAuthor: Jim HarmonReleased on Project Gutenberg: September 14, 2007
- Measure for MeasureAuthor: William ShakespeareReleased on Project Gutenberg: December 1, 1997
- Measure for MeasureAuthor: William ShakespeareReleased on Project Gutenberg: November 1, 1998
- Measure for MeasureAuthor: William ShakespeareReleased on Project Gutenberg: June 1, 1999
- Measure for MeasureAuthor: William ShakespeareReleased on Project Gutenberg: July 1, 2000
- Measure for Measure: The Works of William Shakespeare [Cambridge Edition] [9 vols.]Author: William Shakespeare, William George Clark, Glover, John, librarian of Trinity College, Cambridge [Editor]Released on Project Gutenberg: December 12, 2007
- Mechanical Drawing Self-Taught: Comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing; together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, enginAuthor: Rose, JoshuaReleased on Project Gutenberg: November 4, 2007
- Mediaeval Lore from Bartholomew AnglicusAuthor: Bartholomaeus, Anglicus, active 13th century, William Morris, Robert Steele, Trevisa, John, -Released on Project Gutenberg: September 1, 2004
- Mediaeval SocialismAuthor: Bede JarrettReleased on Project Gutenberg: October 4, 2006
- Medical Essays, 1842-1882Author: Oliver Wendell HolmesReleased on Project Gutenberg: September 29, 2004
- Medieval EuropeAuthor: H. W. Carless (Henry William Carless) DavisReleased on Project Gutenberg: August 1, 2004
- Medieval PeopleAuthor: Eileen PowerReleased on Project Gutenberg: August 9, 2004
- MeditationsAuthor: Emperor of Rome Marcus AureliusReleased on Project Gutenberg: June 1, 2001
- Mediæval Wales: Chiefly in the Twelfth and Thirteenth Centuries: Six Popular LecturesAuthor: A. G. (Andrew George) LittleReleased on Project Gutenberg: March 29, 2008
- Medoline Selwyn's WorkAuthor: Colter, J. J., Mrs.Released on Project Gutenberg: March 26, 2006
- Meeting of the BoardAuthor: Alan Edward NourseReleased on Project Gutenberg: October 3, 2007
- Melbourne HouseAuthor: Susan WarnerReleased on Project Gutenberg: June 26, 2006
- Melbourne House, Volume 1Author: Susan WarnerReleased on Project Gutenberg: July 20, 2004
- Melbourne House, Volume 2Author: Susan WarnerReleased on Project Gutenberg: July 20, 2004
- Melchior's Dream and Other TalesAuthor: Juliana Horatia EwingReleased on Project Gutenberg: August 17, 2005
- Melmoth ReconciledAuthor: Honoré de Balzac, Ellen MarriageReleased on Project Gutenberg: April 3, 2005