- The Illustrious PrinceAuthor: E. Phillips (Edward Phillips) OppenheimReleased on Project Gutenberg: September 1, 1998
- The Imaginary InvalidAuthor: Molière, Wall, Charles Heron [Translator]Released on Project Gutenberg: October 1, 2005
- The Imaginary MarriageAuthor: Henry St. John CooperReleased on Project Gutenberg: February 18, 2005
- The Imitation of ChristAuthor: à Kempis Thomas, William BenhamReleased on Project Gutenberg: February 1, 1999
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- The Immortals: Masterpieces of Fiction, Crowned by the French Academy — CompleteAuthor: VariousReleased on Project Gutenberg: October 30, 2004
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- The Importance of Being Earnest: A Trivial Comedy for Serious PeopleAuthor: Oscar WildeReleased on Project Gutenberg: March 1, 1997
- The ImpossiblesAuthor: Randall Garrett, Laurence M. JaniferReleased on Project Gutenberg: August 16, 2007
- The Impostures of ScapinAuthor: Molière, Wall, Charles Heron [Translator]Released on Project Gutenberg: August 1, 2005
- The Improvement of Human Reason: Exhibited in the Life of Hai Ebn YokdhanAuthor: Ibn Tufayl, Muhammad ibn 'Abd al-MalikReleased on Project Gutenberg: October 8, 2005
- The Inca of Perusalem: An Almost Historical ComediettaAuthor: Bernard ShawReleased on Project Gutenberg: October 1, 2002
- The Incomparable 29th and the "River Clyde"Author: George DavidsonReleased on Project Gutenberg: May 5, 2008
- The Incomplete AmoristAuthor: E. (Edith) NesbitReleased on Project Gutenberg: November 1, 2005
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- The Indeterminate Sentence: What Shall Be Done with the Criminal Class?Author: Charles Dudley WarnerReleased on Project Gutenberg: December 5, 2004
- The Indian Fairy Book: From the Original LegendsAuthor: Cornelius Mathews, John McLenanReleased on Project Gutenberg: August 5, 2007
- The Indian Lily and Other StoriesAuthor: Hermann Sudermann, Ludwig LewisohnReleased on Project Gutenberg: February 1, 2006
- The Indian On The Trail: From "Mackinac And Lake Stories", 1899Author: Mary Hartwell CatherwoodReleased on Project Gutenberg: October 30, 2007
- The Indian's Hand: 1892Author: Lorimer StoddardReleased on Project Gutenberg: October 24, 2007
- The Indiscreet LetterAuthor: Eleanor Hallowell AbbottReleased on Project Gutenberg: April 29, 2005
- The Indiscretion of the Duchess: Being a Story Concerning Two Ladies, a Nobleman, and a NecklaceAuthor: Anthony HopeReleased on Project Gutenberg: October 31, 2004
- The Indolence of the FilipinoAuthor: José Rizal, Charles E. (Charles Edward) DerbyshireReleased on Project Gutenberg: November 1, 2004
- The Indulgence of Negu MahAuthor: Robert ArthurReleased on Project Gutenberg: December 3, 2007
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- The Infant's Delight: PoetryAuthor: AnonymousReleased on Project Gutenberg: February 1, 2004
- The Infernal MarriageAuthor: Disraeli, Benjamin, Earl of BeaconsfieldReleased on Project Gutenberg: December 3, 2006
- The InfernoAuthor: Henri Barbusse, Edward J. (Edward Joseph) O'BrienReleased on Project Gutenberg: May 1, 2004
- The Influence of India and Persia on the Poetry of GermanyAuthor: Arthur F. J. RemyReleased on Project Gutenberg: March 5, 2006
- The Influence of Old Norse Literature on English LiteratureAuthor: Conrad Hjalmar Nordby, Lewis Freeman Mott, William H. (William Henry) CarpenterReleased on Project Gutenberg: October 18, 2004
- The Influence of Sea Power Upon History, 1660-1783Author: A. T. (Alfred Thayer) MahanReleased on Project Gutenberg: September 26, 2004
- The Infra-MediansAuthor: Sewell Peaslee WrightReleased on Project Gutenberg: March 17, 2007
- The InheritorsAuthor: Joseph Conrad, Ford Madox FordReleased on Project Gutenberg: February 3, 2005
- The Inhumanity of SocialismAuthor: Edward F. (Edward Francis) AdamsReleased on Project Gutenberg: May 1, 2004
- The Ink-Stain (Tache d'encre) — CompleteAuthor: René BazinReleased on Project Gutenberg: October 30, 2004
- The Ink-Stain (Tache d'encre) — Volume 1Author: René BazinReleased on Project Gutenberg: April 1, 2003
- The Ink-Stain (Tache d'encre) — Volume 2Author: René BazinReleased on Project Gutenberg: April 1, 2003
- The Ink-Stain (Tache d'encre) — Volume 3Author: René BazinReleased on Project Gutenberg: April 1, 2003
- The Inmate Of The Dungeon: 1894Author: W. C. MorrowReleased on Project Gutenberg: October 24, 2007
- The Inn at the Red OakAuthor: Latta GriswoldReleased on Project Gutenberg: February 1, 2006
- The Inn of DreamsAuthor: Olive CustanceReleased on Project Gutenberg: September 23, 2007
- The Inner Life: Part 3 from The Works of John Greenleaf Whittier, Volume VIIAuthor: John Greenleaf WhittierReleased on Project Gutenberg: December 1, 2005
- The Inner ShrineAuthor: Basil KingReleased on Project Gutenberg: December 20, 2004
- The Inner Sisterhood: A Social Study in High ColorsAuthor: Douglass SherleyReleased on Project Gutenberg: February 26, 2005
- The innocence of Father BrownAuthor: G. K. (Gilbert Keith) ChestertonReleased on Project Gutenberg: July 9, 2008
- The Innocents AbroadAuthor: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 01Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 02Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 03Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 04Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 05Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents Abroad — Volume 06Author: Mark TwainReleased on Project Gutenberg: June 22, 2004
- The Innocents: A Story for LoversAuthor: Sinclair LewisReleased on Project Gutenberg: May 11, 2008
- The Inns and Taverns of "Pickwick": With Some Observations on Their Other AssociationsAuthor: B. W. (Bertram Waldrom) MatzReleased on Project Gutenberg: March 1, 2004
- The Insect FolkAuthor: Margaret Warner MorleyReleased on Project Gutenberg: July 8, 2006
- The Inside of the Cup — CompleteAuthor: Winston ChurchillReleased on Project Gutenberg: October 17, 2004
- The Inside of the Cup — Volume 01Author: Winston ChurchillReleased on Project Gutenberg: October 17, 2004
- The Inside of the Cup — Volume 02Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Inside of the Cup — Volume 03Author: Winston ChurchillReleased on Project Gutenberg: October 17, 2004
- The Inside of the Cup — Volume 04Author: Winston ChurchillReleased on Project Gutenberg: October 17, 2004