- Cumner's Son and Other South Sea Folk — Volume 05Author: Gilbert ParkerReleased on Project Gutenberg: July 1, 2004
- Cupboard Love: The Lady of the Barge and Others, Part 5.Author: W. W. (William Wymark) Jacobs, Maurice Greiffenhagen, Richards, Amy, activeReleased on Project Gutenberg: April 1, 2004
- Cupid's Almanac and Guide to Hearticulture for This Year and NextAuthor: Oliver Herford, John Cecil ClayReleased on Project Gutenberg: December 2, 2007
- Cupid's UnderstudyAuthor: Salisbury FieldReleased on Project Gutenberg: January 1, 2003
- Curiosities of Literature, Vol. 2Author: Isaac Disraeli, Disraeli, Benjamin, Earl of BeaconsfieldReleased on Project Gutenberg: July 24, 2005
- Curiosities of Literature, Vol. 1Author: Isaac Disraeli, Disraeli, Benjamin, Earl of BeaconsfieldReleased on Project Gutenberg: May 26, 2007
- Curiosities of the SkyAuthor: Garrett Putman ServissReleased on Project Gutenberg: October 1, 2004
- Curious, if True: Strange TalesAuthor: Elizabeth Cleghorn GaskellReleased on Project Gutenberg: March 19, 2008
- Curlie Carson Listens InAuthor: Roy J. (Roy Judson) SnellReleased on Project Gutenberg: September 22, 2006
- Curly and Floppy Twistytail (The Funny Piggie Boys)Author: Howard Roger GarisReleased on Project Gutenberg: March 1, 2004
- Current superstitionsAuthor: Fanny D. (Fanny Dickerson) Bergen, William Wells NewellReleased on Project Gutenberg: August 5, 2006
- Custer, and Other Poems.Author: Ella Wheeler WilcoxReleased on Project Gutenberg: January 23, 2007
- Custom and MythAuthor: Andrew LangReleased on Project Gutenberg: November 17, 2004
- Customs and Fashions in Old New EnglandAuthor: Alice Morse EarleReleased on Project Gutenberg: January 4, 2008
- Cutlass and CudgelAuthor: George Manville Fenn, Schönberg, John [Illustrator]Released on Project Gutenberg: May 4, 2007
- Cy Whittaker's PlaceAuthor: Joseph Crosby LincolnReleased on Project Gutenberg: June 3, 2006
- Cyclopedia of EconomicsAuthor: Samuel Vaknin, Rangelovska, Lidija [Editor]Released on Project Gutenberg: February 1, 2004
- Cyclopedia of PhilosophyAuthor: Samuel Vaknin, Rangelovska, Lidija [Editor]Released on Project Gutenberg: February 1, 2004
- Cyclopedia of Telephony and Telegraphy, Vol. 1: A General Reference Work on Telephony, etc. etc.Author: American School of CorrespondenceReleased on Project Gutenberg: April 14, 2005
- CymbelineAuthor: William ShakespeareReleased on Project Gutenberg: December 1, 1997
- CymbelineAuthor: William ShakespeareReleased on Project Gutenberg: November 1, 1998
- CymbelineAuthor: William ShakespeareReleased on Project Gutenberg: June 1, 1999
- CymbelineAuthor: William ShakespeareReleased on Project Gutenberg: July 1, 2000
- Cynthia's Revels; Or, The Fountain of Self-LoveAuthor: Jonson, BenReleased on Project Gutenberg: February 1, 2003
- Cyprus, as I Saw It in 1879Author: Baker, Samuel White, SirReleased on Project Gutenberg: January 1, 2003
- Cyrano de BergeracAuthor: Edmond Rostand, Guillemard, Mary F. [Translator], Thomas, Gladys [Translator]Released on Project Gutenberg: March 1, 1998
- Cyropaedia: The Education of CyrusAuthor: Xenophon, Henry Graham DakynsReleased on Project Gutenberg: February 1, 2000
- CythereaAuthor: Joseph HergesheimerReleased on Project Gutenberg: November 1, 2004
- Cæsar or NothingAuthor: Pío Baroja, Louis HowReleased on Project Gutenberg: July 1, 2005
- Cæsar's Column: A Story of the Twentieth CenturyAuthor: Ignatius DonnellyReleased on Project Gutenberg: February 1, 2004
- D'Ri and I: A Tale of Daring Deeds in the Second War with the British.: Being the Memoirs of Colonel Ramon Bell, U.S.A.Author: Irving BachellerReleased on Project Gutenberg: May 1, 2004
- Dab Kinzer: A Story of a Growing BoyAuthor: William O. StoddardReleased on Project Gutenberg: November 1, 2003
- Daddy Do-Funny's Wisdom JinglesAuthor: Ruth McEnery Stuart, G. H. (George Henry) ClementsReleased on Project Gutenberg: September 25, 2006
- Daddy Takes Us SkatingAuthor: Howard Roger GarisReleased on Project Gutenberg: November 1, 2003
- Daddy Takes Us to the Garden: The Daddy Series for Little FolksAuthor: Howard Roger GarisReleased on Project Gutenberg: February 1, 2005
- Daddy-Long-LegsAuthor: Jean WebsterReleased on Project Gutenberg: August 1, 1994
- Daemonologie.Author: King of England James IReleased on Project Gutenberg: June 29, 2008
- Dahcotah: Life and Legends of the Sioux Around Fort SnellingAuthor: Mary H. (Mary Henderson) EastmanReleased on Project Gutenberg: January 1, 2004
- Daily Strength for Daily NeedsAuthor: Mary Wilder TilestonReleased on Project Gutenberg: July 1, 2005
- Daily Thoughts: selected from the writings of Charles Kingsley by his wifeAuthor: Charles Kingsley, Frances Eliza Grenfell KingsleyReleased on Project Gutenberg: February 28, 2007
- DaisyAuthor: Susan WarnerReleased on Project Gutenberg: June 26, 2006
- Daisy Ashford: Her BookAuthor: Daisy Ashford, Ashford, Angela, Irvin S. (Irvin Shrewsbury) CobbReleased on Project Gutenberg: May 31, 2008
- Daisy in the FieldAuthor: Susan WarnerReleased on Project Gutenberg: June 26, 2006
- Daisy Miller: A StudyAuthor: Henry JamesReleased on Project Gutenberg: July 3, 2008
- Damaged Goods: The great play "Les avariés" by Brieux, novelized with the approval of the authorAuthor: Upton Sinclair, Eugène BrieuxReleased on Project Gutenberg: January 1, 1998
- Dame CareAuthor: Hermann Sudermann, Overbeck, Bertha [Translator]Released on Project Gutenberg: July 1, 2005
- Dame Duck's First Lecture on EducationAuthor: UnknownReleased on Project Gutenberg: July 12, 2007
- Dame Wonder's Picture Alphabet: Amusing Alphabet, Dame Wonder's Series.Author: AnonymousReleased on Project Gutenberg: November 15, 2007
- Damn! A Book of CalumnyAuthor: H. L. (Henry Louis) MenckenReleased on Project Gutenberg: July 31, 2006
- Damned If You Don'tAuthor: Randall Garrett, H. R. Van DongenReleased on Project Gutenberg: December 28, 2007
- Damon and Delia: A TaleAuthor: William GodwinReleased on Project Gutenberg: November 1, 2003
- Dan MerrithewAuthor: Lawrence Perry, McFall, J. V. [Illustrator]Released on Project Gutenberg: September 24, 2005
- Danger in Deep SpaceAuthor: Rockwell, Carey, Willy Ley, Glanzman, Louis [Illustrator]Released on Project Gutenberg: November 4, 2006
- Danger signalsAuthor: John A. (John Alexander) Hill, Jasper Ewing BradyReleased on Project Gutenberg: August 8, 2006
- Danger! A True History of a Great City's Wiles and Temptations: The Veil Lifted, and Light Thrown on Crime and its Causes, and Criminals and their Haunts. Facts and Disclosures.Author: William F. Howe, Abraham H. HummelReleased on Project Gutenberg: February 29, 2008
- Danger! and Other StoriesAuthor: Arthur Conan DoyleReleased on Project Gutenberg: August 19, 2007
- Danger; Or, Wounded in the House of a FriendAuthor: T. S. (Timothy Shay) ArthurReleased on Project Gutenberg: October 1, 2003
- Dangerous AgesAuthor: Rose MacaulayReleased on Project Gutenberg: October 4, 2005
- Dangerous DaysAuthor: Mary Roberts RinehartReleased on Project Gutenberg: April 1, 1999
- Dangers on the Ice Off the Coast of Labrador: With Some Interesting Particulars Respecting the Natives of that CountryAuthor: AnonymousReleased on Project Gutenberg: November 10, 2004