- De Amicitia, Scipio's DreamAuthor: Cicero, Marcus Tullius, Andrew P. (Andrew Preston) PeabodyReleased on Project Gutenberg: February 1, 2005
- De Carmine Pastorali: Prefixed to Thomas Creech's translation of the Idylliums of Theocritus (1684)Author: René Rapin, J. E. (James Edmund) Congleton, Thomas CreechReleased on Project Gutenberg: December 28, 2004
- De La Salle Fifth ReaderAuthor: Christian BrothersReleased on Project Gutenberg: January 1, 2004
- De Libris: Prose and VerseAuthor: Austin DobsonReleased on Project Gutenberg: February 1, 2006
- De Orbe Novo, Volume 1 (of 2): The Eight Decades of Peter Martyr D'AngheraAuthor: Pietro Martire d' Anghiera, Francis Augustus MacNuttReleased on Project Gutenberg: May 1, 2004
- De ProfundisAuthor: Oscar WildeReleased on Project Gutenberg: May 1, 1997
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- Deadwood Dick, the Prince of the Road; or, The Black Rider of the Black HillsAuthor: Wheeler, Edward L. (Edward Lytton)Released on Project Gutenberg: February 4, 2005
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- Dear EnemyAuthor: Jean WebsterReleased on Project Gutenberg: July 3, 2008
- DearestAuthor: H. Beam Piper, Vincent NapoliReleased on Project Gutenberg: August 22, 2006
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- Death Valley in '49: Important chapter of California pioneer history. The autobiography of a pioneer, detailing his life from a humble home in the Green Mountains to the gold mines of California; and particularly reciting the sufferings of the band of men, women and children who gave "Death Valley" Author: William Lewis ManlyReleased on Project Gutenberg: May 1, 2004
- Death—and After?Author: Annie BesantReleased on Project Gutenberg: April 27, 2006
- Debate on Woman Suffrage in the Senate of the United States,: 2d Session, 49th Congress, December 8, 1886, and January 25, 1887Author: VariousReleased on Project Gutenberg: February 1, 2004
- Debian GNU/Linux : Guide to Installation and UsageAuthor: Goerzen, John, Othman, OssamaReleased on Project Gutenberg: September 1, 2004
- Debit and Credit: Translated from the German of Gustav FreytagAuthor: Gustav FreytagReleased on Project Gutenberg: November 11, 2006
- Deborah Dent and Her Donkey and Madam Fig's Gala: Two Humorous TalesAuthor: UnknownReleased on Project Gutenberg: May 31, 2008
- Debris: Selections from PoemsAuthor: Madge Morris WagnerReleased on Project Gutenberg: June 22, 2005
- Debts of HonorAuthor: Mór Jókai, Arthur B. (Arthur Battishill) YollandReleased on Project Gutenberg: September 24, 2007
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- December LoveAuthor: Robert HichensReleased on Project Gutenberg: April 22, 2006
- Deductive LogicAuthor: St. George William Joseph StockReleased on Project Gutenberg: September 1, 2004
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- Deep Down, a Tale of the Cornish MinesAuthor: R. M. (Robert Michael) BallantyneReleased on Project Gutenberg: June 7, 2007
- Deep FurrowsAuthor: Herbert Joseph MoorhouseReleased on Project Gutenberg: June 1, 2007
- Deep WatersAuthor: W. W. (William Wymark) Jacobs, Will OwenReleased on Project Gutenberg: March 1, 2004
- Deephaven and Selected Stories & SketchesAuthor: Sarah Orne JewettReleased on Project Gutenberg: June 4, 2005
- Deer GodchildAuthor: Bernard, Marguerite, Serrell, EdithReleased on Project Gutenberg: August 6, 2004
- DeerbrookAuthor: Harriet MartineauReleased on Project Gutenberg: January 7, 2008
- Deerfoot in The MountainsAuthor: Edward Sylvester Ellis, John Steeple DavisReleased on Project Gutenberg: May 5, 2008
- Defenders of Democracy: Contributions from representative men and women of letters and other arts from our allies and our own country, edited by the Gift book committee of the Militia of MercyAuthor: Militia of Mercy (U.S.). Gift Book CommitteeReleased on Project Gutenberg: May 1, 2002
- Definition & Reality in the General Theory of Political EconomyAuthor: Thomas (Thomas Herman Anthonius Maria) CoolReleased on Project Gutenberg: May 30, 2005
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- Democracy and Social EthicsAuthor: Jane AddamsReleased on Project Gutenberg: March 28, 2005
- Democracy in America — Volume 1Author: Alexis de Tocqueville, Henry ReeveReleased on Project Gutenberg: January 21, 2006
- Democracy in America — Volume 2Author: Alexis de Tocqueville, Henry ReeveReleased on Project Gutenberg: January 21, 2006
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- DemosAuthor: George GissingReleased on Project Gutenberg: August 1, 2003
- DenmarkAuthor: Thomson, M. PearsonReleased on Project Gutenberg: December 13, 2006
- Dennison Grant: A Novel of To-dayAuthor: Robert J. C. SteadReleased on Project Gutenberg: June 3, 2006
- Denslow's Humpty DumptyAuthor: W. W. (William Wallace) DenslowReleased on Project Gutenberg: June 23, 2008