- The Crimson Fairy BookAuthor: Andrew LangReleased on Project Gutenberg: December 1, 2000
- The Crisis in RussiaAuthor: Arthur RansomeReleased on Project Gutenberg: May 1, 1998
- The Crisis of the Naval WarAuthor: John Rushworth JellicoeReleased on Project Gutenberg: December 1, 2003
- The Crisis — CompleteAuthor: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 01Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 02Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 03Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 04Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 05Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 06Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 07Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Crisis — Volume 08Author: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The Critique of Practical ReasonAuthor: Immanuel Kant, Thomas Kingsmill AbbottReleased on Project Gutenberg: May 1, 2004
- The Critique of Pure ReasonAuthor: Immanuel Kant, J. M. D. (John Miller Dow) MeiklejohnReleased on Project Gutenberg: July 1, 2003
- The Crock of GoldAuthor: James StephensReleased on Project Gutenberg: January 1, 1999
- The Crock of Gold: A Rural NovelAuthor: Martin Farquhar TupperReleased on Project Gutenberg: November 14, 2005
- The Crofton BoysAuthor: Harriet MartineauReleased on Project Gutenberg: August 26, 2007
- The Crofton BoysAuthor: Harriet Martineau, Joseph Martin KronheimReleased on Project Gutenberg: October 31, 2007
- The CromptonsAuthor: Mary Jane HolmesReleased on Project Gutenberg: June 27, 2005
- The crooked houseAuthor: Fleming, BrandonReleased on Project Gutenberg: September 30, 2007
- The Crooked Man and Other RhymesAuthor: AnonymousReleased on Project Gutenberg: November 3, 2007
- The Cross and the Shamrock: Or, How To Defend The Faith. An Irish-American Catholic Tale Of Real Life, Descriptive Of The Temptations, Sufferings, Trials, And Triumphs Of The Children Of St. Patrick In The Great Republic Of Washington. A Book For The Entertainment And Special Instructions Of The CatAuthor: Hugh QuigleyReleased on Project Gutenberg: October 28, 2005
- The Cross of Berny; Or, Irene's LoversAuthor: Girardin, Emile de, Mme, Théophile Gautier, Joseph Méry, Jules Sandeau, Fendall, Florence [Translator]Released on Project Gutenberg: August 15, 2004
- The Cross-CutAuthor: Courtney Ryley Cooper, George W. GageReleased on Project Gutenberg: December 13, 2006
- The CrossingAuthor: Winston ChurchillReleased on Project Gutenberg: October 19, 2004
- The crowdAuthor: Gustave Le BonReleased on Project Gutenberg: February 1, 1996
- The Crown of LifeAuthor: George GissingReleased on Project Gutenberg: October 1, 2003
- The Crown of SuccessAuthor: A. L. O. E.Released on Project Gutenberg: May 18, 2008
- The Crown of Thorns: A Token for the SorrowingAuthor: E. H. (Edwin Hubbell) ChapinReleased on Project Gutenberg: November 1, 1999
- The Crucial Moment: 1911Author: Charles Egbert CraddockReleased on Project Gutenberg: November 19, 2007
- The Crucifixion of Philip StrongAuthor: Charles M. SheldonReleased on Project Gutenberg: April 14, 2006
- The Cruise of the "Cachalot" Round the World After Sperm WhalesAuthor: Frank Thomas BullenReleased on Project Gutenberg: June 1, 1998
- The Cruise of the "Dainty"; Or, Rovings in the PacificAuthor: William Henry Giles KingstonReleased on Project Gutenberg: May 15, 2007
- The Cruise of the "Esmeralda"Author: Harry Collingwood, William Heysham OverendReleased on Project Gutenberg: June 17, 2008
- The Cruise of the Alabama and the Sumter: From the Private Journals and Other Papers of Commander R. Semmes, C.S.N., and Other OfficersAuthor: Raphael SemmesReleased on Project Gutenberg: August 12, 2004
- The Cruise of the DazzlerAuthor: Jack LondonReleased on Project Gutenberg: February 1, 2004
- The Cruise of the DolphinAuthor: Thomas Bailey AldrichReleased on Project Gutenberg: May 1, 1999
- The Cruise of the Dry DockAuthor: T. S. (Thomas Sigismund) Stribling, Herbert Morton StoopsReleased on Project Gutenberg: December 1, 2005
- The Cruise of the Jasper B.Author: Don MarquisReleased on Project Gutenberg: November 1, 1996
- The Cruise of the Kawa: Wanderings in the South SeasAuthor: George S. (George Shepard) ChappellReleased on Project Gutenberg: September 1, 2004
- The Cruise of the Mary Rose; Or, Here and There in the PacificAuthor: William Henry Giles Kingston, Alfred PearseReleased on Project Gutenberg: May 15, 2007
- The Cruise of the Noah's ArkAuthor: David CoryReleased on Project Gutenberg: June 22, 2006
- The Cruise of the Nonsuch BuccaneerAuthor: Harry Collingwood, Williamson, John [Illustrator]Released on Project Gutenberg: April 13, 2007
- The cruise of the SnarkAuthor: Jack LondonReleased on Project Gutenberg: February 1, 2001
- The Cruise of the Thetis: A Tale of the Cuban InsurrectionAuthor: Harry Collingwood, Cyrus CuneoReleased on Project Gutenberg: April 14, 2007
- The Crusade of the ExcelsiorAuthor: Bret HarteReleased on Project Gutenberg: May 17, 2006
- The Crushed Flower, and Other StoriesAuthor: Leonid Andreyev, Herman BernsteinReleased on Project Gutenberg: May 1, 2004
- The Cryptogram: A Story of Northwest CanadaAuthor: William Murray GraydonReleased on Project Gutenberg: January 15, 2008
- The Crystal Hunters: A Boy's Adventures in the Higher AlpsAuthor: George Manville Fenn, Frederic William BurtonReleased on Project Gutenberg: February 4, 2008
- The Crystal StopperAuthor: Maurice LeblancReleased on Project Gutenberg: December 1, 1998
- The Cuckoo ClockAuthor: Mrs. Molesworth, Walter CraneReleased on Project Gutenberg: April 6, 2005
- The Culprit Fay, and Other PoemsAuthor: Joseph Rodman DrakeReleased on Project Gutenberg: August 1, 1995
- The Cultivation of The Native Grape, and Manufacture of American WinesAuthor: George HusmannReleased on Project Gutenberg: March 27, 2007
- The Culture of Vegetables and Flowers From Seeds and Roots: 16th EditionAuthor: Sutton & Sons Ltd.Released on Project Gutenberg: July 7, 2005
- The Curious Book of BirdsAuthor: Abbie Farwell Brown, E. Boyd (Elmer Boyd) SmithReleased on Project Gutenberg: June 27, 2005
- The Curious Case of Lady Purbeck: A Scandal of the XVIIth CenturyAuthor: Thomas LonguevilleReleased on Project Gutenberg: March 4, 2005
- The Curious Republic of Gondour, and Other Whimsical SketchesAuthor: Mark TwainReleased on Project Gutenberg: September 17, 2004
- The Curly-Haired HenAuthor: A. (Auguste) Vimar, Nora Kathleen HillsReleased on Project Gutenberg: August 27, 2004
- The Curlytops and Their Pets; Or, Uncle Toby's Strange CollectionAuthor: Howard Roger Garis, Greene, Julia [Illustrator]Released on Project Gutenberg: April 12, 2007
- The Curlytops and Their Playmates; Or, Jolly Times Through the HolidaysAuthor: Howard Roger Garis, Greene, Julia [Illustrator]Released on Project Gutenberg: April 23, 2008