- The Polity of the Athenians and the LacedaemoniansAuthor: Xenophon, Henry Graham DakynsReleased on Project Gutenberg: January 1, 1998
- The Pomp of the Lavilettes, CompleteAuthor: Gilbert ParkerReleased on Project Gutenberg: November 16, 2004
- The Pomp of the Lavilettes, Volume 1Author: Gilbert ParkerReleased on Project Gutenberg: August 1, 2004
- The Pomp of the Lavilettes, Volume 2Author: Gilbert ParkerReleased on Project Gutenberg: August 1, 2004
- The Pomp of YesterdayAuthor: Joseph HockingReleased on Project Gutenberg: April 22, 2008
- The Pony Rider Boys in Montana; Or, The Mystery of the Old Custer TrailAuthor: Frank Gee PatchinReleased on Project Gutenberg: July 1, 2004
- The Pony Rider Boys in New Mexico; Or, The End of the Silver TrailAuthor: Frank Gee PatchinReleased on Project Gutenberg: January 1, 2004
- The Pony Rider Boys in Texas; Or, The Veiled Riddle of the PlainsAuthor: Frank Gee PatchinReleased on Project Gutenberg: December 10, 2006
- The Pony Rider Boys in the Grand Canyon; Or, The Mystery of Bright Angel GulchAuthor: Frank Gee PatchinReleased on Project Gutenberg: July 22, 2004
- The Pony Rider Boys in the Ozarks; Or, The Secret of Ruby MountainAuthor: Frank Gee PatchinReleased on Project Gutenberg: July 1, 2004
- The Pony Rider Boys in the Rockies; Or, The Secret of the Lost ClaimAuthor: Frank Gee PatchinReleased on Project Gutenberg: July 1, 2004
- The Pony Rider Boys with the Texas Rangers; Or, On the Trail of the Border BanditsAuthor: Frank Gee PatchinReleased on Project Gutenberg: July 22, 2004
- The Pool in the DesertAuthor: Sara Jeannette DuncanReleased on Project Gutenberg: January 1, 1998
- The Poor ClareAuthor: Elizabeth Cleghorn GaskellReleased on Project Gutenberg: March 1, 2001
- The Poor GentlemanAuthor: Hendrik ConscienceReleased on Project Gutenberg: October 2, 2004
- The Poor Little Rich GirlAuthor: Eleanor GatesReleased on Project Gutenberg: April 26, 2005
- The Poor PlutocratsAuthor: Mór Jókai, R. Nisbet (Robert Nisbet) BainReleased on Project Gutenberg: June 27, 2006
- The Poor Scholar: Traits And Stories Of The Irish Peasantry, The Works of: William Carleton, Volume ThreeAuthor: William Carleton, Flanery, M. L. [Illustrator]Released on Project Gutenberg: June 7, 2005
- The Poorhouse Waif and His Divine Teacher: A True StoryAuthor: Isabel C. (Isabel Coston) ByrumReleased on Project Gutenberg: December 1, 2004
- The Port of AdventureAuthor: C. N. (Charles Norris) Williamson, A. M. (Alice Muriel) WilliamsonReleased on Project Gutenberg: February 1, 2004
- The Port of Missing MenAuthor: Meredith NicholsonReleased on Project Gutenberg: November 1, 2004
- The Portent and Other StoriesAuthor: George MacDonaldReleased on Project Gutenberg: September 1, 2005
- The Portion of LaborAuthor: Mary Eleanor Wilkins FreemanReleased on Project Gutenberg: March 18, 2006
- The Portland Peerage RomanceAuthor: Charles J. (Charles John) ArchardReleased on Project Gutenberg: December 17, 2004
- The Portrait of a Lady — Volume 1Author: Henry JamesReleased on Project Gutenberg: September 1, 2001
- The Portrait of a Lady — Volume 2Author: Henry JamesReleased on Project Gutenberg: September 1, 2001
- The PortygeeAuthor: Joseph Crosby LincolnReleased on Project Gutenberg: May 30, 2006
- The Positive School of Criminology: Three Lectures Given at the University of Naples, Italy on April 22, 23 and 24, 1901Author: Enrico FerriReleased on Project Gutenberg: January 1, 2004
- The possessedAuthor: Fyodor Dostoyevsky, Constance GarnettReleased on Project Gutenberg: May 1, 2005
- The Post OfficeAuthor: Rabindranath Tagore, Mukherjee, Devabrata [Translator]Released on Project Gutenberg: September 1, 2004
- The postal service of the United States in connection with the local history of BuffaloAuthor: Nathan Kelsey Hall, Thomas BlossomReleased on Project Gutenberg: September 30, 2007
- The Posthumous Works of Thomas De Quincey, Vol. 1Author: Thomas De Quincey, Alexander H. (Alexander Hay) JappReleased on Project Gutenberg: December 9, 2007
- The Posthumous Works of Thomas De Quincey, Vol. 2Author: Thomas De Quincey, Alexander H. (Alexander Hay) JappReleased on Project Gutenberg: June 30, 2008
- The Postmaster's DaughterAuthor: Louis TracyReleased on Project Gutenberg: November 1, 2003
- The Posy Ring: A Book of Verse for ChildrenAuthor: Kate Douglas Smith Wiggin, Nora Archibald SmithReleased on Project Gutenberg: October 8, 2007
- The Pot Boiler: A Comedy in Four ActsAuthor: Upton SinclairReleased on Project Gutenberg: June 1, 2004
- The Pot of Gold, and Other StoriesAuthor: Mary Eleanor Wilkins FreemanReleased on Project Gutenberg: August 7, 2005
- The Potato Child & OthersAuthor: Lucia Prudence Hall WoodburyReleased on Project Gutenberg: May 1, 2004
- The PothuntersAuthor: P. G. (Pelham Grenville) WodehouseReleased on Project Gutenberg: November 1, 2004
- The Potiphar PapersAuthor: George William CurtisReleased on Project Gutenberg: September 1, 2004
- The Powder MonkeyAuthor: George Manville Fenn, Dudley, Ambrose [Illustrator]Released on Project Gutenberg: May 8, 2007
- The Power and the GloryAuthor: Grace MacGowan Cooke, Arthur Ignatius KellerReleased on Project Gutenberg: November 1, 2003
- The Power of ConcentrationAuthor: William Walker AtkinsonReleased on Project Gutenberg: December 1, 1998
- The Power of Faith: Exemplified In The Life And Writings Of The Late Mrs. Isabella Graham.Author: Isabella GrahamReleased on Project Gutenberg: July 12, 2005
- The Power of Movement in PlantsAuthor: Charles Darwin, Darwin, Francis, SirReleased on Project Gutenberg: May 1, 2004
- The Power of Womanhood, or Mothers and Sons: A Book For Parents, And Those In Loco ParentisAuthor: Ellice HopkinsReleased on Project Gutenberg: June 13, 2005
- The Powers and MaxineAuthor: C. N. (Charles Norris) Williamson, A. M. (Alice Muriel) Williamson, Frank T. MerrillReleased on Project Gutenberg: December 1, 2003
- The Practical Distiller: An Introduction To Making Whiskey, Gin, Brandy, Spirits, &c. &c. of Better Quality, and in Larger Quantities, than Produced by the Present Mode of Distilling, from the Produce of the United StatesAuthor: McHarry, SamuelReleased on Project Gutenberg: April 29, 2007
- The Practical Values of Space Exploration: Report of the Committee on Science and Astronautics, U.S.: House of Representatives, Eighty-Sixth Congress, Second: SessionAuthor: United States. Congress. House. Committee on Science and Astronautics.Released on Project Gutenberg: November 24, 2006
- The Practice and Science of DrawingAuthor: Harold SpeedReleased on Project Gutenberg: December 6, 2004
- The Practice and Theory of BolshevismAuthor: Bertrand RussellReleased on Project Gutenberg: December 19, 2005
- The Practice of the Presence of GodAuthor: Lawrence, of the Resurrection, BrotherReleased on Project Gutenberg: May 1, 2004
- The Practice of the Presence of God the Best Rule of a Holy LifeAuthor: Lawrence, of the Resurrection, BrotherReleased on Project Gutenberg: October 26, 2004
- The PrairieAuthor: James Fenimore CooperReleased on Project Gutenberg: September 1, 2004
- The Prairie ChiefAuthor: R. M. (Robert Michael) BallantyneReleased on Project Gutenberg: June 6, 2007
- The Prairie Farmer, Vol. 56, No. 2, January 12, 1884: A Weekly Journal for the Farm, Orchard and FiresideAuthor: VariousReleased on Project Gutenberg: February 5, 2006
- The Prairie MotherAuthor: Arthur Stringer, Arthur E. BecherReleased on Project Gutenberg: July 8, 2008
- The Prairie Traveler: A Hand-book for Overland ExpeditionsAuthor: Randolph B. (Randolph Barnes) MarcyReleased on Project Gutenberg: October 17, 2007
- The Prairie WifeAuthor: Arthur Stringer, Harvey DunnReleased on Project Gutenberg: July 19, 2006
- The Praise of FollyAuthor: Desiderius Erasmus, John WilsonReleased on Project Gutenberg: November 1, 2005