- Studies and Essays: Quality, and OthersAuthor: John GalsworthyReleased on Project Gutenberg: September 24, 2004
- Studies and Essays: The Inn of Tranquility, and OthersAuthor: John GalsworthyReleased on Project Gutenberg: September 24, 2004
- Studies from Court and Cloister: being essays, historical and literary dealing mainly with subjects relating to the XVIth and XVIIth centuriesAuthor: J. M. (Jean Mary) StoneReleased on Project Gutenberg: August 1, 2003
- Studies in Central American Picture-Writing: First Annual Report of the Bureau of Ethnology to the: Secretary of the Smithsonian Institution, 1879-80,: Government Printing Office, Washington, 1881, pages 205-245Author: Edward S. (Edward Singleton) HoldenReleased on Project Gutenberg: November 20, 2007
- Studies in CivicsAuthor: J. T. (James Thompson) McClearyReleased on Project Gutenberg: January 1, 2004
- Studies in Early Victorian LiteratureAuthor: Frederic HarrisonReleased on Project Gutenberg: May 12, 2006
- Studies in Forensic PsychiatryAuthor: Bernard GlueckReleased on Project Gutenberg: September 3, 2006
- Studies in LiteratureAuthor: John MorleyReleased on Project Gutenberg: April 1, 2004
- Studies in Literature and HistoryAuthor: Lyall, Alfred C., Sir, Miller, John O. [Editor]Released on Project Gutenberg: June 30, 2008
- Studies in Occultism; A Series of Reprints from the Writings of H. P. Blavatsky: No. 1: Practical Occultism—Occultism versus the Occult: Arts—The Blessings of PublicityAuthor: H. P. (Helena Petrovna) BlavatskyReleased on Project Gutenberg: November 5, 2005
- Studies in SongAuthor: Algernon Charles SwinburneReleased on Project Gutenberg: October 31, 2005
- Studies in Song, A Century of Roundels, Sonnets on English Dramatic Poets, The Heptalogia, Etc.: From Swinburne's Poems Volume V.Author: Algernon Charles SwinburneReleased on Project Gutenberg: July 8, 2006
- Studies in the Life of the Christian: His Faith and His ServiceAuthor: Henry T. (Henry Thorne) SellReleased on Project Gutenberg: January 1, 2005
- Studies in the Psychology of Sex, Volume 1: The Evolution of Modesty; The Phenomena of Sexual Periodicity; Auto-ErotismAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies in the Psychology of Sex, Volume 2: Sexual InversionAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies in the Psychology of Sex, Volume 3: Analysis of the Sexual Impulse; Love and Pain; The Sexual Impulse in WomenAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies in the Psychology of Sex, Volume 4: Sexual Selection In ManAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies in the Psychology of Sex, Volume 5: Erotic Symbolism; The Mechanism of Detumescence; The Psychic State in PregnancyAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies in the Psychology of Sex, Volume 6: Sex in Relation to SocietyAuthor: Havelock EllisReleased on Project Gutenberg: October 8, 2004
- Studies of Lowell (from Literary Friends and Acquaintance)Author: William Dean HowellsReleased on Project Gutenberg: October 22, 2004
- Studies of TreesAuthor: Jacob Joshua LevisonReleased on Project Gutenberg: June 23, 2005
- Study and Stimulants: Or, the Use of Intoxicants and Narcotics in Relation to Intellectual Life, as Illustrated by Personal Communications on the Subject, from Men of Letters and of ScienceAuthor: A. Arthur (Alfred Arthur) ReadeReleased on Project Gutenberg: October 1, 2004
- Study of a WomanAuthor: Honoré de Balzac, Katharine Prescott WormeleyReleased on Project Gutenberg: October 7, 2005
- Study of Child LifeAuthor: Marion Foster WashburneReleased on Project Gutenberg: September 15, 2004
- StyleAuthor: Raleigh, Walter Alexander, SirReleased on Project Gutenberg: September 1, 1997
- Style in SingingAuthor: Haslam, W. E.Released on Project Gutenberg: May 9, 2007
- Submission to Divine Providence in the Death of Children: Recommended and inforced, in a sermon preached at: Northampton, on the death of a very amiable and hopeful: child, about five years oldAuthor: Philip DoddridgeReleased on Project Gutenberg: July 21, 2008
- Subspace SurvivorsAuthor: E. E. (Edward Elmer) Smith, H. R. Van DongenReleased on Project Gutenberg: May 30, 2007
- Suburban SketchesAuthor: William Dean HowellsReleased on Project Gutenberg: December 1, 2004
- SubversiveAuthor: Mack Reynolds, John SchoenherrReleased on Project Gutenberg: October 26, 2007
- Success (Second Edition)Author: Beaverbrook, Max Aitken, BaronReleased on Project Gutenberg: March 4, 2005
- Success with Small FruitsAuthor: Edward Payson RoeReleased on Project Gutenberg: July 1, 2004
- Success: A NovelAuthor: Samuel Hopkins AdamsReleased on Project Gutenberg: March 21, 2005
- Successful Exploration Through the Interior of Australia: From Melbourne to the Gulf of CarpentariaAuthor: William John WillsReleased on Project Gutenberg: June 1, 2004
- Successful Methods of Public SpeakingAuthor: Grenville KleiserReleased on Project Gutenberg: April 1, 2006
- Successful RecitationsAuthor: Alfred H. (Alfred Henry) MilesReleased on Project Gutenberg: December 22, 2005
- Such Is LifeAuthor: Joseph FurphyReleased on Project Gutenberg: October 1, 2002
- Sue, A Little HeroineAuthor: L. T. MeadeReleased on Project Gutenberg: December 9, 2006
- Sugar and Spice: Comical Tales Comically DressedAuthor: Johnson, JamesReleased on Project Gutenberg: January 1, 2004
- Suite MentaleAuthor: Randall Garrett, Ed EmshwillerReleased on Project Gutenberg: September 25, 2007
- Summa Theologica, Part I (Prima Pars): From the Complete American EditionAuthor: Thomas, Aquinas, SaintReleased on Project Gutenberg: January 26, 2006
- Summa Theologica, Part I-II (Pars Prima Secundae): From the Complete American EditionAuthor: Thomas, Aquinas, SaintReleased on Project Gutenberg: March 1, 2006
- Summa Theologica, Part II-II (Secunda Secundae): Translated by Fathers of the English Dominican ProvinceAuthor: Thomas, Aquinas, SaintReleased on Project Gutenberg: July 4, 2006
- Summa Theologica, Part III (Tertia Pars): From the Complete American EditionAuthor: Thomas, Aquinas, SaintReleased on Project Gutenberg: November 28, 2006
- SummerAuthor: Edith WhartonReleased on Project Gutenberg: March 12, 2006
- Summer on the Lakes, in 1843Author: Margaret FullerReleased on Project Gutenberg: March 1, 2004
- Summerfield: or, Life on a FarmAuthor: Day Kellogg LeeReleased on Project Gutenberg: December 12, 2007
- SummitAuthor: Mack ReynoldsReleased on Project Gutenberg: December 1, 2007
- Sun-Up, and Other PoemsAuthor: Lola RidgeReleased on Project Gutenberg: August 1, 2003
- Sunday at Home (From "Twice Told Tales")Author: Nathaniel HawthorneReleased on Project Gutenberg: November 1, 2005
- Sunday Under Three HeadsAuthor: Charles DickensReleased on Project Gutenberg: May 1, 1997
- Sundown SlimAuthor: Henry Herbert Knibbs, Anton Otto FischerReleased on Project Gutenberg: July 20, 2005
- Sunk at SeaAuthor: R. M. (Robert Michael) BallantyneReleased on Project Gutenberg: October 31, 2007
- Sunny Boy and His PlaymatesAuthor: White, Ramy Allison, Howard L. (Howard Livingston) HastingsReleased on Project Gutenberg: March 2, 2006
- Sunny Memories Of Foreign Lands, Volume 1Author: Harriet Beecher StoweReleased on Project Gutenberg: November 4, 2004
- Sunny Memories of Foreign Lands, Volume 2Author: Harriet Beecher StoweReleased on Project Gutenberg: November 1, 2004
- Sunny SlopesAuthor: Ethel Hueston, Arthur William BrownReleased on Project Gutenberg: May 20, 2006
- SunriseAuthor: William BlackReleased on Project Gutenberg: December 14, 2005
- Sunset Pass; or, Running the Gauntlet Through Apache LandAuthor: Charles KingReleased on Project Gutenberg: November 27, 2006
- Sunshine BillAuthor: William Henry Giles KingstonReleased on Project Gutenberg: May 15, 2007