| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? |
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| The £1,000,000 bank-note | | 1917 | Author | |  | |  | |
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| The adventures of Huckleberry Finn | | 1933 | Author | | | | | |
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| The adventures of Huckleberry Finn (Tom Sawyer's comrade) | | 1923 | Author | | | | | |
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| The adventures of Huckleberry Finn | | 1918 | Author | | | |  | | 
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| The adventures of Thomas Jefferson Snodgrass | | 1928 | Author | | | |  | |
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| The adventures of Tom Sawyer | | 1932 | Author | | | | | |
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| The adventures of Tom Sawyer: together with The celebrated jumping frog of Calaveras county and other tales | | 1937 | Author | | | | | |
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| The adventures of Tom Sawyer | | 1933 | Author | | | | | |
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| The adventures of Tom Sawyer | | 1936 | Author | | |  | | |
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| The adventures of Tom Sawyer | | 1936 | Author | | | | | |
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| America in story | | 1932 | Author of Section | | | | | |
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| American fiction: Edgar Allan Poe | | 1917 | Author | | | | | |
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| American ghost stories | | 1928 | Author of Section | | | | | |
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| The best American humorous short stories | | 1920 | Author of Section | | | | | |   
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| The Boy scouts book of stories | | 1919 | Author of Section | | | | | |
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| A Connecticut Yankee in King Arthur's court | | 1930 | Author | | | | | |
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| Europe and elsewhere | | 1923 | Author | | | | | |
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| The Great modern American stories: an anthology | | 1920 | Author of Section | | | | | |
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| In defense of Harriet Shelley, and other essays | | 1918 | Author | | | | | |
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| The innocents abroad | | 1927 | Author | | | | | |
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| The innocents abroad | | 1929 | Author | | | | | |
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| The jumping frog: in English, then in French, then clawed back into a civilized language once more by patient, unremunerated toil | | 1903 | Author | | | | | |
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| The letters of Quintus Curtius Snodgrass | | 1946 | Author | | | | | |
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| Life on the Mississippi | | 1923 | Author | | | | | |
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| Life on the Mississippi | | 1935 | Author | | | | | |
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| Lords of the housetops: thirteen cat tales | | 1921 | Author of Section | | | | | |
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| Mark Twain | | 1932 | Author | | | | | |
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| Mark Twain [and] G. W. Cable: the record of a literary friendship | | 1960 | Author | | | | | |
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| Mark Twain, business man | 1st ed. | 1946 | Author | | | | | |
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| Mark Twain in three moods: three new items of Twainiana | | 1948 | Author | | | | | |
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| The Mark Twain omnibus | | 1935 | Author | | | | | |
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| Mark Twain's Autobiography: in two volumes | | 1924 | Author | | | | | |
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| Mark Twain's notebook | | 1935 | Author | | | | | |
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| Mark Twain's San Francisco | [1st ed.] | 1963 | Author | | | | | |
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| Mark Twain's Speeches | | 1923 | Author | | | | | |
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| Mark Twain (Samuel Langhorne Clemens): representative selections, with introduction and bibliography | | 1935 | Author | | | | | |
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| Moments with Mark Twain | | 1920 | Author | | | | | |
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| The mysterious stranger: a romance | | 1916 | Author | | | | | |
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| The mysterious stranger and other stories | 1st ed. | 1922 | Author | | | | | |
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| The prince and the pauper: a tale for young people of all ages | | 1909 | Author | | | | | |
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| Republican letters | | 1941 | Author | | | | | |
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| Saint Joan of Arc | | 1919 | Author | | | | | |
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| The sequel to Sonia | | 1927 | Author | | | | | |
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| Short stories for English courses | | 1920 | Author of Section | | | | | |
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| Short stories for high schools | | 1915 | Author of Section | | | | | |
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| Sketches of the sixties | | 1927 | Author | | | | | |
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| Sketches of the sixties: being forgotten material now collected for the first time from the Californian 1864-67 | | 1926 | Author | | | | | |
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| Slovenly Peter =: Der Struwwelpeter | | 1935 | Translator | | |  | | |
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| Slovenly Peter (Struwwelpeter), or, Happy tales and funny pictures | | 1935 | Author | | | | | |
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| Thirteen ghostly yarns | | 1932 | Author of Section | | | | | |
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| A tramp abroad | | 1907 | Author | | | | | |
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| A tramp abroad | | 1903 | Author | | | | | |
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| A tramp abroad | | 1921 | Author | | | | | |
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| Washington in 1868 | "First edition." | 1943 | Author | | | | | |
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| What is man?: and other essays | | 1917 | Author | | | | | |
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| What is man? | | 1906 | Author | | | | | |
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| When Huck Finn went highbrow | | 1934 | Author | | | | | |
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Public Domain Books