- They Call Me Carpenter: A Tale of the Second ComingAuthor: Upton SinclairReleased on Project Gutenberg: May 1, 2004
- Things Mother Used to Make: A Collection of Old Time Recipes, Some Nearly One Hundred Years Old and Never Published BeforeAuthor: Gurney, Lydia MariaReleased on Project Gutenberg: July 1, 2005
- Things To MakeAuthor: Archibald WilliamsReleased on Project Gutenberg: January 11, 2005
- Think Before You Speak; Or, The Three WishesAuthor: Dorset, Catherine Ann Turner, Jeanne-Marie Leprince de BeaumontReleased on Project Gutenberg: June 4, 2008
- Third class in Indian railwaysAuthor: Mahatma GandhiReleased on Project Gutenberg: January 31, 2008
- Thirteen Chapters of American History: represented by the Edward Moran series of Thirteen Historical Marine PaintingsAuthor: Theodore SutroReleased on Project Gutenberg: April 4, 2008
- Thirteen months in the Rebel ArmyAuthor: Stevenson, William G.Released on Project Gutenberg: April 17, 2005
- Thirty Indian legendsAuthor: Margaret BemisterReleased on Project Gutenberg: April 2, 2008
- Thirty Years a Slave: From Bondage to Freedom: The Institution of Slavery as Seen on the Plantation and in the Home of the Planter: Autobiography of Louis HughesAuthor: Louis HughesReleased on Project Gutenberg: December 1, 2003
- Thirty Years in the ItinerancyAuthor: W. G. (Wesson Gage) MillerReleased on Project Gutenberg: May 1, 2004
- Thirty-One Years on the Plains and in the Mountains, Or, the Last Voice from the Plains: An Authentic Record of a Life Time of Hunting, Trapping, Scouting and Indian Fighting in the Far WestAuthor: William F. DrannanReleased on Project Gutenberg: March 1, 2004
- This Country of OursAuthor: H. E. (Henrietta Elizabeth) MarshallReleased on Project Gutenberg: February 1, 2003
- This Crowded EarthAuthor: Robert BlochReleased on Project Gutenberg: June 13, 2008
- This FreedomAuthor: A. S. M. (Arthur Stuart-Menteth) HutchinsonReleased on Project Gutenberg: September 1, 2004
- This Giddy GlobeAuthor: Oliver HerfordReleased on Project Gutenberg: July 14, 2008
- This Is the EndAuthor: Stella BensonReleased on Project Gutenberg: February 1, 2004
- This Side of ParadiseAuthor: F. Scott (Francis Scott) FitzgeraldReleased on Project Gutenberg: February 1, 1997
- This Simian WorldAuthor: Clarence DayReleased on Project Gutenberg: November 1, 2004
- This World Is TabooAuthor: Murray LeinsterReleased on Project Gutenberg: April 14, 2006
- This World Must Die!Author: H. B. (Horace Bowne) FyfeReleased on Project Gutenberg: October 20, 2007
- Thistle and Rose: A Story for GirlsAuthor: Amy Walton, Robert BarnesReleased on Project Gutenberg: April 27, 2007
- Thomas CarlyleAuthor: John NicholReleased on Project Gutenberg: January 1, 2006
- Thomas Davis, selections from his prose and poetryAuthor: Thomas Davis, T. W. (Thomas William) RollestonReleased on Project Gutenberg: April 24, 2007
- Thomas Hariot, the Mathematician, the Philosopher and the ScholarAuthor: Henry StevensReleased on Project Gutenberg: February 1, 2004
- Thomas Hart Benton's Remarks to the Senate on the Expunging ResolutionAuthor: Thomas Hart BentonReleased on Project Gutenberg: December 1, 1996
- Thomas Henry Huxley: A Character SketchAuthor: Leonard HuxleyReleased on Project Gutenberg: March 21, 2005
- Thomas Henry Huxley; A Sketch Of His Life And WorkAuthor: Mitchell, P. Chalmers (Peter Chalmers), SirReleased on Project Gutenberg: October 25, 2005
- Thomas Jefferson BrownAuthor: James Oliver CurwoodReleased on Project Gutenberg: October 24, 2007
- Thomas Jefferson, a Character SketchAuthor: Edward Sylvester EllisReleased on Project Gutenberg: January 21, 2006
- Thomas Lord CromwellAuthor: William ShakespeareReleased on Project Gutenberg: May 1, 1999
- Thomas Wingfold, CurateAuthor: George MacDonaldReleased on Project Gutenberg: June 1, 2004
- Thomas Wingfold, Curate V1Author: George MacDonaldReleased on Project Gutenberg: June 1, 2004
- Thomas Wingfold, Curate V2Author: George MacDonaldReleased on Project Gutenberg: June 1, 2004
- Thomas Wingfold, Curate V3Author: George MacDonaldReleased on Project Gutenberg: June 1, 2004
- ThoroughbredsAuthor: William Alexander FraserReleased on Project Gutenberg: October 1, 2005
- Those Extraordinary TwinsAuthor: Mark TwainReleased on Project Gutenberg: September 16, 2004
- Those Who Smiled, and Eleven Other StoriesAuthor: Perceval GibbonReleased on Project Gutenberg: December 26, 2007
- Thought-FormsAuthor: Annie Besant, C. W. (Charles Webster) LeadbeaterReleased on Project Gutenberg: July 12, 2005
- Thoughts I Met on the Highway: Words of Friendly Cheer From "The Life Books"Author: Ralph Waldo TrineReleased on Project Gutenberg: May 15, 2006
- Thoughts of Marcus AureliusAuthor: Emperor of Rome Marcus Aurelius, George LongReleased on Project Gutenberg: November 1, 2004
- Thoughts of Marcus Aurelius AntoninusAuthor: Emperor of Rome Marcus Aurelius, George LongReleased on Project Gutenberg: May 22, 2005
- Thoughts on Educational Topics and InstitutionsAuthor: George S. (George Sewall) BoutwellReleased on Project Gutenberg: August 16, 2006
- Thoughts on Man, His Nature, Productions and Discoveries: Interspersed with Some Particulars Respecting the AuthorAuthor: William GodwinReleased on Project Gutenberg: December 1, 1996
- Thoughts on MissionsAuthor: Sheldon DibbleReleased on Project Gutenberg: July 15, 2008
- Thoughts on ReligionAuthor: George John Romanes, Charles GoreReleased on Project Gutenberg: October 25, 2005
- Thoughts on religion at the frontAuthor: N. S. (Neville Stuart) TalbotReleased on Project Gutenberg: October 1, 2006
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- Thoughts on the Present Discontents, and SpeechesAuthor: Edmund Burke, Henry MorleyReleased on Project Gutenberg: May 1, 2000
- Thoughts out of Season, Part IAuthor: Friedrich Wilhelm Nietzsche, Anthony M. (Anthony Mario) LudoviciReleased on Project Gutenberg: May 1, 2004
- Thoughts Suggested by Mr. Froude's "Progress"Author: Charles Dudley WarnerReleased on Project Gutenberg: December 5, 2004
- Thoughts, Moods and Ideals: Crimes of LeisureAuthor: W. D. (William Douw) LighthallReleased on Project Gutenberg: January 6, 2005
- Three Acres and LibertyAuthor: Bolton HallReleased on Project Gutenberg: October 1, 2003
- Three Articles on MetaphorAuthor: Society for Pure English, A. (Arthur) Clutton-Brock, Elizabeth Bridges Daryush, H. W. (Henry Watson) FowlerReleased on Project Gutenberg: August 28, 2004
- Three at Table: The Lady of the Barge and Others, Part 12.Author: W. W. (William Wymark) Jacobs, Maurice Greiffenhagen, Richards, Amy, activeReleased on Project Gutenberg: April 1, 2004
- Three Boys in the Wild North LandAuthor: Egerton Ryerson Young, Laughlin, J. E. [Illustrator]Released on Project Gutenberg: April 27, 2007
- Three Boys; Or, The Chiefs of the Clan MackhaiAuthor: George Manville FennReleased on Project Gutenberg: May 4, 2007
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- Three Dialogues Between Hylas and Philonous in Opposition to Sceptics and AtheistsAuthor: George BerkeleyReleased on Project Gutenberg: December 1, 2003