- Uarda : a Romance of Ancient Egypt — Volume 10Author: Georg Ebers, Clara BellReleased on Project Gutenberg: April 1, 2004
- Uller UprisingAuthor: H. Beam Piper, John F. Carr, John D. (John Drury) ClarkReleased on Project Gutenberg: October 5, 2006
- Ullr UprisingAuthor: H. Beam PiperReleased on Project Gutenberg: September 25, 2006
- Ulster's Stand For UnionAuthor: Ronald McNeillReleased on Project Gutenberg: December 11, 2004
- UlyssesAuthor: James JoyceReleased on Project Gutenberg: July 1, 2003
- Umboo, the ElephantAuthor: Howard Roger GarisReleased on Project Gutenberg: June 1, 2004
- Umbrellas and Their HistoryAuthor: William SangsterReleased on Project Gutenberg: October 1, 2004
- Una of the hill country: 1911Author: Charles Egbert CraddockReleased on Project Gutenberg: November 19, 2007
- Unbeaten Tracks in JapanAuthor: Isabella L. (Isabella Lucy) BirdReleased on Project Gutenberg: May 1, 2000
- Unborn TomorrowAuthor: Mack Reynolds, Kelly FreasReleased on Project Gutenberg: December 20, 2007
- Uncle Bernac: A Memory of the EmpireAuthor: Arthur Conan DoyleReleased on Project Gutenberg: January 1, 2004
- Uncle Josh's Punkin Centre StoriesAuthor: Cal StewartReleased on Project Gutenberg: July 1, 1997
- Uncle MaxAuthor: Rosa Nouchette CareyReleased on Project Gutenberg: June 17, 2005
- Uncle Noah's Christmas InspirationAuthor: Leona DalrympleReleased on Project Gutenberg: May 15, 2005
- Uncle Remus and Brer RabbitAuthor: Joel Chandler HarrisReleased on Project Gutenberg: August 9, 2007
- Uncle Remus, His Songs and His SayingsAuthor: Joel Chandler HarrisReleased on Project Gutenberg: August 1, 2000
- Uncle Robert's Geography (Uncle Robert's Visit, V.3)Author: Francis W. (Francis Wayland) Parker, Nellie Lathrop HelmReleased on Project Gutenberg: September 1, 2004
- Uncle Rutherford's Nieces: A Story for GirlsAuthor: Joanna H. (Joanna Hooe) MathewsReleased on Project Gutenberg: June 3, 2007
- Uncle Sam's Boys in the Philippines; or, Following the Flag against the MorosAuthor: H. Irving (Harrie Irving) HancockReleased on Project Gutenberg: November 11, 2007
- Uncle Sam's Boys with Pershing's Troops: Or, Dick Prescott at Grips with the BocheAuthor: H. Irving (Harrie Irving) HancockReleased on Project Gutenberg: July 3, 2004
- Uncle Silas: A Tale of Bartram-HaughAuthor: Joseph Sheridan Le FanuReleased on Project Gutenberg: January 31, 2005
- Uncle Titus and His Visit to the CountryAuthor: Johanna Spyri, Louise BrooksReleased on Project Gutenberg: January 17, 2005
- Uncle Tom's CabinAuthor: Harriet Beecher StoweReleased on Project Gutenberg: January 13, 2006
- Uncle Tom's Cabin, Young Folks' EditionAuthor: Harriet Beecher StoweReleased on Project Gutenberg: February 1, 2004
- Uncle Vanya: Scenes from Country Life in Four ActsAuthor: Anton Pavlovich ChekhovReleased on Project Gutenberg: May 1, 1999
- Uncle Wiggily and Old Mother Hubbard: Adventures of the Rabbit Gentleman with the Mother Goose CharactersAuthor: Howard Roger Garis, Bloomfield, Edward [Illustrator], Lang CampbellReleased on Project Gutenberg: October 27, 2007
- Uncle Wiggily in the WoodsAuthor: Howard Roger Garis, Louis WisaReleased on Project Gutenberg: February 20, 2006
- Uncle Wiggily's AdventuresAuthor: Howard Roger Garis, Louis WisaReleased on Project Gutenberg: March 7, 2005
- Uncle Wiggily's TravelsAuthor: Howard Roger Garis, Louis WisaReleased on Project Gutenberg: March 8, 2005
- Uncle William: The Man Who Was Shif'lessAuthor: Jennette LeeReleased on Project Gutenberg: April 13, 2006
- Unconscious ComediansAuthor: Honoré de Balzac, Katharine Prescott WormeleyReleased on Project Gutenberg: March 1, 1998
- Unconscious MemoryAuthor: Samuel ButlerReleased on Project Gutenberg: October 1, 2004
- Under Drake's Flag: A Tale of the Spanish MainAuthor: G. A. (George Alfred) Henty, Gordon BrowneReleased on Project Gutenberg: September 8, 2006
- Under FireAuthor: Charles KingReleased on Project Gutenberg: December 14, 2006
- Under Fire: The Story of a SquadAuthor: Henri Barbusse, W. Fitzwater WrayReleased on Project Gutenberg: August 1, 2003
- Under Handicap: A NovelAuthor: Jackson GregoryReleased on Project Gutenberg: March 14, 2006
- Under King ConstantineAuthor: Katrina TraskReleased on Project Gutenberg: December 1, 2003
- Under Sealed OrdersAuthor: H. A. (Hiram Alfred) CodyReleased on Project Gutenberg: September 17, 2005
- Under the AndesAuthor: Rex StoutReleased on Project Gutenberg: June 1, 1996
- Under the Chilian Flag: A Tale of War between Chili and PeruAuthor: Harry Collingwood, W. (William) RaineyReleased on Project Gutenberg: April 13, 2007
- Under the Country SkyAuthor: Grace S. (Grace Smith) Richmond, Rogers, Frances [Illustrator]Released on Project Gutenberg: March 1, 2007
- Under the DeodarsAuthor: Rudyard KiplingReleased on Project Gutenberg: September 1, 2001
- Under the dragon flagAuthor: Allan, JamesReleased on Project Gutenberg: August 1, 2005
- Under the Great BearAuthor: Kirk Munroe, Howard GilesReleased on Project Gutenberg: September 11, 2006
- Under the Greenwood Tree; Or, The Mellstock Quire: A Rural Painting of the Dutch SchoolAuthor: Thomas HardyReleased on Project Gutenberg: June 1, 2001
- Under the LilacsAuthor: Louisa May AlcottReleased on Project Gutenberg: February 1, 2003
- Under the Meteor Flag: Log of a Midshipman during the French Revolutionary WarAuthor: Harry CollingwoodReleased on Project Gutenberg: April 13, 2007
- Under the Ocean to the South Pole; Or, the Strange Cruise of the Submarine WonderAuthor: Rockwood, RoyReleased on Project Gutenberg: November 7, 2006
- Under the Prophet in Utah; the National Menace of a Political PriestcraftAuthor: Frank J. Cannon, Harvey Jerrold O'HigginsReleased on Project Gutenberg: December 1, 2004
- Under the Rebel's ReignAuthor: Charles Neufeld, Charles Mills SheldonReleased on Project Gutenberg: December 12, 2007
- Under the red robeAuthor: Stanley John WeymanReleased on Project Gutenberg: September 1, 1999
- Under the RedwoodsAuthor: Bret HarteReleased on Project Gutenberg: May 18, 2006
- Under the RoseAuthor: Frederic Stewart IshamReleased on Project Gutenberg: December 2, 2007
- Under the SkylightsAuthor: Henry Blake FullerReleased on Project Gutenberg: May 1, 2005
- Under the StormAuthor: Charlotte M. (Charlotte Mary) YongeReleased on Project Gutenberg: July 1, 2004
- Under the TreeAuthor: Elizabeth Madox RobertsReleased on Project Gutenberg: March 26, 2007
- Under the Trees and ElsewhereAuthor: Hamilton Wright MabieReleased on Project Gutenberg: October 27, 2006
- Under the Waves: Diving in Deep WatersAuthor: R. M. (Robert Michael) Ballantyne, Pearson [Illustrator]Released on Project Gutenberg: November 15, 2007
- Under the Window: Pictures & Rhymes for ChildrenAuthor: Kate GreenawayReleased on Project Gutenberg: October 5, 2007
- Under Two FlagsAuthor: OuidaReleased on Project Gutenberg: April 6, 2006