- Pretty Tales for the NurseryAuthor: Thompson, Isabel, John GilbertReleased on Project Gutenberg: May 14, 2008
- Preventable DiseasesAuthor: Woods HutchinsonReleased on Project Gutenberg: June 29, 2007
- Price/Cost Indexes from 1875 to 1989; Estimated to 2010Author: Michael HartReleased on Project Gutenberg: November 1, 1993
- Pride and PrejudiceAuthor: Jane AustenReleased on Project Gutenberg: June 1, 1998
- Priestley in America, 1794-1804Author: Edgar Fahs SmithReleased on Project Gutenberg: March 6, 2007
- Primavera: Poems by Four AuthorsAuthor: Stephen Phillips, Laurence Binyon, Arthur Shearly Cripps, Manmohan GhoseReleased on Project Gutenberg: September 4, 2006
- Prime Ministers and Some Others: A Book of ReminiscencesAuthor: George William Erskine RussellReleased on Project Gutenberg: August 12, 2005
- Primitive Christian Worship: Or, The Evidence of Holy Scripture and the Church, Against the Invocation of Saints and Angels, and the Blessed Virgin MaryAuthor: James Endell TylerReleased on Project Gutenberg: November 17, 2004
- Primitive Love and Love-StoriesAuthor: Henry T. FinckReleased on Project Gutenberg: April 1, 2004
- Primitive Psycho-Therapy and QuackeryAuthor: Robert Means LawrenceReleased on Project Gutenberg: November 2, 2007
- Prince Eugene and His TimesAuthor: L. (Luise) MühlbachReleased on Project Gutenberg: May 1, 2003
- Prince FortunatusAuthor: William BlackReleased on Project Gutenberg: July 6, 2005
- Prince HagenAuthor: Upton SinclairReleased on Project Gutenberg: July 1, 2002
- Prince Henry the Navigator, the Hero of Portugal and of Modern Discovery, 1394-1460 A.D.: With an Account of Geographical Progress Throughout the Middle Ages As the Preparation for His Work.Author: C. Raymond (Charles Raymond) BeazleyReleased on Project Gutenberg: July 4, 2006
- Prince Jan, St. BernardAuthor: Forrestine C. (Forrestine Cooper) HookerReleased on Project Gutenberg: February 3, 2005
- Prince or Chauffeur? A Story of NewportAuthor: Lawrence Perry, McFall, J. V. [Illustrator]Released on Project Gutenberg: August 25, 2007
- Prince Otto, a RomanceAuthor: Robert Louis StevensonReleased on Project Gutenberg: December 1, 1995
- Prince PrigioAuthor: Andrew Lang, Gordon BrowneReleased on Project Gutenberg: March 19, 2007
- Prince Prigio: From "His Own Fairy Book"Author: Andrew LangReleased on Project Gutenberg: June 25, 2007
- Prince Ricardo of Pantouflia: Being the Adventures of Prince Prigio's SonAuthor: Andrew Lang, Gordon BrowneReleased on Project Gutenberg: July 4, 2007
- Prince ZaleskiAuthor: M. P. (Matthew Phipps) ShielReleased on Project Gutenberg: January 1, 2004
- Prince Zilah — CompleteAuthor: Jules ClaretieReleased on Project Gutenberg: October 30, 2004
- Prince Zilah — Volume 1Author: Jules ClaretieReleased on Project Gutenberg: April 1, 2003
- Prince Zilah — Volume 2Author: Jules ClaretieReleased on Project Gutenberg: April 1, 2003
- Prince Zilah — Volume 3Author: Jules ClaretieReleased on Project Gutenberg: April 1, 2003
- PrincessAuthor: M. G. (Mary Greenway) McClellandReleased on Project Gutenberg: January 18, 2006
- Princess MaritzaAuthor: Percy James BrebnerReleased on Project Gutenberg: August 1, 2004
- Princess Polly At PlayAuthor: Brooks, AmyReleased on Project Gutenberg: May 13, 2008
- Princess Polly's Gay WinterAuthor: Brooks, AmyReleased on Project Gutenberg: September 1, 2004
- Princess Polly's PlaymatesAuthor: Brooks, AmyReleased on Project Gutenberg: April 1, 2004
- Princess ZaraAuthor: Beeckman, Ross, Knight, Bert [Illustrator]Released on Project Gutenberg: January 26, 2008
- Principal CairnsAuthor: John CairnsReleased on Project Gutenberg: February 1, 2004
- Principle and Practice: The Orphan FamilyAuthor: Harriet MartineauReleased on Project Gutenberg: October 20, 2007
- Principles of FreedomAuthor: Terence J. (Terence Joseph) MacSwineyReleased on Project Gutenberg: August 7, 2004
- Principles of Home Decoration, With Practical ExamplesAuthor: Candace WheelerReleased on Project Gutenberg: December 8, 2004
- Principles of TeachingAuthor: Adam S. (Adam Samuel) BennionReleased on Project Gutenberg: December 14, 2005
- PrintcrimeAuthor: Cory DoctorowReleased on Project Gutenberg: April 24, 2006
- Printers' Marks: A Chapter in the History of TypographyAuthor: W. (William) RobertsReleased on Project Gutenberg: June 1, 2008
- Printing and the Renaissance: A paper read before the Fortnightly Club of Rochester, New YorkAuthor: John Rothwell SlaterReleased on Project Gutenberg: July 11, 2008
- Priscilla's SpiesAuthor: George A. BirminghamReleased on Project Gutenberg: January 23, 2008
- Prisoner for BlasphemyAuthor: G. W. (George William) FooteReleased on Project Gutenberg: December 1, 2004
- Prisoners of Chance: The Story of What Befell Geoffrey Benteen, Borderman, through His Love for a Lady of FranceAuthor: Randall Parrish, Margaret West Kinney, Troy KinneyReleased on Project Gutenberg: February 25, 2006
- Prisoners of Hope: A Tale of Colonial VirginiaAuthor: Mary JohnstonReleased on Project Gutenberg: June 21, 2007
- Prisoners: Fast Bound In Misery And IronAuthor: Mary CholmondeleyReleased on Project Gutenberg: July 16, 2006
- Private PeatAuthor: Harold Reginald PeatReleased on Project Gutenberg: September 12, 2005
- Privateering and Piracy in the Colonial Period: Illustrative DocumentsAuthor: J. Franklin (John Franklin) JamesonReleased on Project Gutenberg: March 20, 2008
- Prize Money: Sailor's Knots, Part 10.Author: W. W. (William Wymark) Jacobs, Will OwenReleased on Project Gutenberg: January 1, 2004
- Probabilities : An aid to FaithAuthor: Martin Farquhar TupperReleased on Project Gutenberg: October 13, 2005
- Probable SonsAuthor: Amy Le FeuvreReleased on Project Gutenberg: January 1, 2004
- PRoblemAuthor: Alan Edward NourseReleased on Project Gutenberg: January 15, 2008
- Problems in American DemocracyAuthor: Thames WilliamsonReleased on Project Gutenberg: September 1, 2004
- Problems of Conduct: An Introductory Survey of EthicsAuthor: Durant DrakeReleased on Project Gutenberg: May 1, 2004
- Problems of Expansion: As Considered in Papers and AddressesAuthor: Whitelaw ReidReleased on Project Gutenberg: July 15, 2008
- Problems of Immanence: studies critical and constructiveAuthor: Joseph WarschauerReleased on Project Gutenberg: May 16, 2007
- Problems of Poverty: An Inquiry into the Industrial Condition of the PoorAuthor: J. A. (John Atkinson) HobsonReleased on Project Gutenberg: January 1, 2004
- Professor Royce's Libel: A Public Appeal for Redress to the Corporation and Overseers of Harvard UniversityAuthor: Francis Ellingwood AbbotReleased on Project Gutenberg: November 12, 2006
- Profiles from China: Sketches in Free Verse of People and Things Seen in the InteriorAuthor: Eunice TietjensReleased on Project Gutenberg: August 5, 2004
- Progressive Morality: An Essay in EthicsAuthor: Thomas FowlerReleased on Project Gutenberg: April 1, 2004
- Project Gutenberg Complete Works of Winston ChurchillAuthor: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- Project MastodonAuthor: Clifford D. SimakReleased on Project Gutenberg: August 2, 2007