- Marjorie Dean, College SophomoreAuthor: Chase, Josephine, -Released on Project Gutenberg: July 14, 2007
- Marjorie Dean, High School FreshmanAuthor: Chase, Josephine, -Released on Project Gutenberg: November 27, 2007
- Marjorie's Busy DaysAuthor: Carolyn WellsReleased on Project Gutenberg: November 18, 2007
- Marjorie's MaytimeAuthor: Carolyn WellsReleased on Project Gutenberg: February 15, 2005
- Marjorie's New FriendAuthor: Carolyn WellsReleased on Project Gutenberg: September 1, 2005
- Marjorie's Three GiftsAuthor: Louisa May AlcottReleased on Project Gutenberg: March 1, 2004
- Marjorie's VacationAuthor: Carolyn WellsReleased on Project Gutenberg: March 1, 2004
- Mark Hurdlestone; Or, The Two BrothersAuthor: Susanna MoodieReleased on Project Gutenberg: October 9, 2005
- Mark Rutherford's DeliveranceAuthor: William Hale WhiteReleased on Project Gutenberg: March 1, 2004
- Mark SeaworthAuthor: William Henry Giles KingstonReleased on Project Gutenberg: May 15, 2007
- Mark TwainAuthor: Archibald Henderson, Alvin Langdon CoburnReleased on Project Gutenberg: November 1, 2004
- Mark Twain's Burlesque AutobiographyAuthor: Mark TwainReleased on Project Gutenberg: September 16, 2004
- Mark Twain's Letters — Complete (1853-1910)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 19, 2004
- Mark Twain's Letters — Volume 1 (1853-1866)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 18, 2004
- Mark Twain's Letters — Volume 2 (1867-1875)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 18, 2004
- Mark Twain's Letters — Volume 3 (1876-1885)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 18, 2004
- Mark Twain's Letters — Volume 4 (1886-1900)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 19, 2004
- Mark Twain's Letters — Volume 5 (1901-1906)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 19, 2004
- Mark Twain's Letters — Volume 6 (1907-1910)Author: Mark Twain, Albert Bigelow PaineReleased on Project Gutenberg: September 19, 2004
- Mark Twain's SpeechesAuthor: Mark TwainReleased on Project Gutenberg: September 17, 2004
- Mark Twain: A Biography. CompleteAuthor: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Mark Twain: A Biography. Volume I, Part 1: 1835-1866Author: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Mark Twain: A Biography. Volume I, Part 2: 1866-1875Author: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Mark Twain: A Biography. Volume II, Part 1: 1886-1900Author: Albert Bigelow PaineReleased on Project Gutenberg: December 1, 2001
- Mark Twain: A Biography. Volume II, Part 2: 1886-1900Author: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Mark Twain: A Biography. Volume III, Part 1: 1900-1907Author: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Mark Twain: A Biography. Volume III, Part 2: 1907-1910Author: Albert Bigelow PaineReleased on Project Gutenberg: October 4, 2004
- Marm LisaAuthor: Kate Douglas Smith WigginReleased on Project Gutenberg: March 1, 2002
- Marmaduke Merry: A Tale of Naval Adventures in Bygone DaysAuthor: William Henry Giles KingstonReleased on Project Gutenberg: May 15, 2007
- Marmion: A Tale Of Flodden FieldAuthor: Walter Scott, Henry MorleyReleased on Project Gutenberg: May 1, 2003
- Marmion: A Tale of Flodden Field in Six CantosAuthor: Walter Scott, Thomas BayneReleased on Project Gutenberg: February 1, 2004
- Marquise Brinvillier: Celebrated CrimesAuthor: Alexandre DumasReleased on Project Gutenberg: September 22, 2004
- Marquise De Ganges: Celebrated CrimesAuthor: Alexandre DumasReleased on Project Gutenberg: September 22, 2004
- MarriageAuthor: Susan FerrierReleased on Project Gutenberg: June 1, 2004
- Marriage and LoveAuthor: Emma GoldmanReleased on Project Gutenberg: March 1, 2007
- Marriage à la modeAuthor: Ward, Humphry, Mrs., Fred PegramReleased on Project Gutenberg: January 16, 2007
- MarriedAuthor: August Strindberg, Seltzer, ThomasReleased on Project Gutenberg: April 1, 2005
- Married life;Author: May EdgintonReleased on Project Gutenberg: April 30, 2005
- Married Life; Its Shadows and SunshineAuthor: T. S. (Timothy Shay) ArthurReleased on Project Gutenberg: November 1, 2003
- Marse Henry: An Autobiography (Volume 1)Author: Henry WattersonReleased on Project Gutenberg: July 1, 2005
- Marse Henry: An Autobiography (Volume 2)Author: Henry WattersonReleased on Project Gutenberg: July 1, 2005
- Marse Henry: An Autobiography, CompleteAuthor: Henry WattersonReleased on Project Gutenberg: July 1, 2005
- Martha By-the-DayAuthor: Julie M. LippmannReleased on Project Gutenberg: February 1, 2005
- Martian V.F.W.Author: Vandenburg, G. L.Released on Project Gutenberg: July 20, 2007
- Martie, the UnconqueredAuthor: Kathleen Thompson NorrisReleased on Project Gutenberg: August 1, 2003
- Martin ChuzzlewitAuthor: Charles DickensReleased on Project Gutenberg: April 27, 2006
- Martin Conisby's VengeanceAuthor: Jeffery FarnolReleased on Project Gutenberg: February 1, 2006
- Martin EdenAuthor: Jack LondonReleased on Project Gutenberg: September 1, 1997
- Martin Guerre: Celebrated CrimesAuthor: Alexandre DumasReleased on Project Gutenberg: September 22, 2004
- Martin Hewitt, InvestigatorAuthor: Arthur MorrisonReleased on Project Gutenberg: February 1, 2004
- Martin Hyde, the Duke's MessengerAuthor: John MasefieldReleased on Project Gutenberg: April 1, 1998
- Martin Luther's Large Catechism, translated by Bente and DauAuthor: Martin Luther, F. (Friedrich) Bente, W. H. T. (William Herman Theodore) DauReleased on Project Gutenberg: April 1, 1999
- Martin Pippin in the Apple OrchardAuthor: Eleanor FarjeonReleased on Project Gutenberg: January 1, 2000
- Martin RattlerAuthor: R. M. (Robert Michael) BallantyneReleased on Project Gutenberg: August 25, 2004
- Martin RattlerAuthor: R. M. (Robert Michael) BallantyneReleased on Project Gutenberg: June 7, 2007
- Martyred ArmeniaAuthor: Fa'iz GhusaynReleased on Project Gutenberg: December 1, 2006
- MarujaAuthor: Bret HarteReleased on Project Gutenberg: May 1, 2000
- Marvels of Modern ScienceAuthor: Severing, Paul, Theodore WatersReleased on Project Gutenberg: July 1, 2004
- Mary AndersonAuthor: Farrar, J. MauriceReleased on Project Gutenberg: January 22, 2005
- Mary Anerley: A Yorkshire TaleAuthor: R. D. (Richard Doddridge) BlackmoreReleased on Project Gutenberg: June 6, 2006