- The United Empire Loyalists: A Chronicle of the Great Migration [1914 ed.]Author: W. Stewart (William Stewart) WallaceReleased on Project Gutenberg: April 1, 2004
- The United States Bill of Rights: The Ten Original Amendments to the Constitution of the United StatesAuthor: United StatesReleased on Project Gutenberg: December 1, 1972
- The United States ConstitutionAuthor: United StatesReleased on Project Gutenberg: December 1, 1975
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- The United States of America, Part 1: 1783-1830Author: Edwin Erle SparksReleased on Project Gutenberg: October 1, 2004
- The United States Since the Civil WarAuthor: Charles Ramsdell LingleyReleased on Project Gutenberg: February 1, 2006
- The Unity of Western CivilizationAuthor: Francis Sydney MarvinReleased on Project Gutenberg: February 12, 2005
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- The Unknown Masterpiece: 1845Author: Honoré de BalzacReleased on Project Gutenberg: October 17, 2007
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- The Unseen World, and Other EssaysAuthor: John FiskeReleased on Project Gutenberg: October 1, 1998
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- The UpanishadsAuthor: Swami ParamanandaReleased on Project Gutenberg: June 1, 2002
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- The Uphill ClimbAuthor: B. M. Bower, Charles M. (Charles Marion) RussellReleased on Project Gutenberg: December 25, 2004
- The Upper Berth; By the Waters of ParadiseAuthor: F. Marion (Francis Marion) CrawfordReleased on Project Gutenberg: August 5, 2007
- The Uprising of a Great People: The United States in 1861. to Which is Added a Word of Peace on the Difference Between England the United States.Author: Gasparin, Agénor, comte de, Mary L. (Mary Louise) BoothReleased on Project Gutenberg: January 1, 2004
- The Upton LettersAuthor: Arthur Christopher BensonReleased on Project Gutenberg: November 1, 2003
- The Use and Need of the Life of Carry A. NationAuthor: Carry Amelia NationReleased on Project Gutenberg: October 1, 1998
- The uses of astronomyAuthor: Edward EverettReleased on Project Gutenberg: July 6, 2005
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- The Vagabond and Other Poems from PunchAuthor: R. C. (Rudolf Chambers) LehmannReleased on Project Gutenberg: July 1, 2005
- The Vale of Cedars; Or, The MartyrAuthor: Grace AguilarReleased on Project Gutenberg: June 1, 2004
- The Valet's Tragedy, and Other StudiesAuthor: Andrew LangReleased on Project Gutenberg: February 1, 2000
- The Valiant RunawaysAuthor: Gertrude Franklin Horn AthertonReleased on Project Gutenberg: February 1, 2003
- The Valley of DecisionAuthor: Edith WhartonReleased on Project Gutenberg: August 1, 2003
- The Valley of FearAuthor: Arthur Conan DoyleReleased on Project Gutenberg: June 1, 2002
- The Valley of FearAuthor: Arthur Conan DoyleReleased on Project Gutenberg: February 1, 2003
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- The Variation of Animals and Plants under Domestication — Volume 1Author: Charles DarwinReleased on Project Gutenberg: October 1, 2001