| Title | Edition | Year of Publication | Role | Country of Publication | Possible Copyright Status | Available Online? |
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| 100% | | 1920 | Author | |  | |  | |    
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| American outpost: a book of reminiscences | | 1932 | Author | | | | | |
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| Autobiography | [1st ed.] | 1962 | Author | | | | | |
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| Bill Porter: a drama of O. Henry in prison | | 1925 | Author | | | | | |
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| The book of life: mind and body | | 1921 | Author | | | | | |
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| Boston (el proceso Sacco-Vanzetti) | | 1930 | Author |  | | | | |
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| Boston: roman | | 1929 | Author |  | | | | |
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| The brass check, a study of American journalism | | 1920 | Author | | | | | |
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| !Carbón! | | 1929 | Author | | | | | |
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| Co-op: a novel of living together | | 1936 | Author | | | | | |
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| Damaged goods | | 1913 | Author | | | | | |
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| The EPIC plan for California | | 1934 | Author | | | | | |
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| The fasting cure | | 1911 | Author | | | | | |
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| The gnomobile: a gnice gnew gnarrative with gnonsense, but gnothing gnaughty | | 1936 | Author | | | | | |
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| The goose-step: a study of American education | | 1923 | Author | | | | | |
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| The goslings: a study of the American schools | | 1924 | Author | | | | | |
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| I, candidate for governor: and how I got licked | | 1935 | Author | | | | | |
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| I, governor of California, and how I ended poverty: a true story of the future | | 1933 | Author | | | | | |
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| Jimmie Higgins | | 1919 | Author | | | | | |
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| The jungle | | 1926 | Author | | | | | |
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| King Coal: a novel | | 1917 | Author | | | | | |
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| Love's pilgrimage | | 1911 | Author | | | | | |
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| Love's pilgrimage | | 1911 | Author | | | | | |
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| Mental radio | | 1930 | Author | | | | | |
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| Mental radio | Rev. 2d print. | 1962 | Author | | | | | |
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| Money writes! | | 1927 | Author | | | | | |
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| My lifetime in letters | | 1960 | Author | | | | | |
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| No pasaran!: (They shall not pass) A story of the battle of Madrid | | 1937 | Author | | | | | |
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| Oil!: A novel | | 1927 | Author | | | | | |
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| The overman | | 1907 | Author | | | | | |
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| !Petróleo ...! | | 1929 | Author | | | | | |
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| Plays of protest: The naturewoman, The machine, The second-story man, Prince Hagen | | 1912 | Author | | | | | |
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| The profits of religion: an essay in economic interpretation | | 1918 | Author | | | | | |
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| The profits of religion: an essay in economic interpretation | | 1927 | Author | |  | | | |
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| Römische vision, roman | | 1932 | Author | | | | | |
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| Raistas (The jungle) parašē Upton Sinclair: Lietuviškon kalbon versta iš angliškos išleido Jonas Naujokas | | 1908 | Author | | | | | |
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| Samuel busca la verdad | | 1928 | Author | | | | | |
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| Samuel der suchende, roman | | 1911 | Author | | | | | |
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| The spokesman's secretary: being the letters of Mame to mom | | 1926 | Author | | | | | |
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| The spy | | 1920 | Author | | | | | |
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| Su majestad el rico (Mountain city) | | 1930 | Author | | | | | |
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| Sylvia: a novel | | 1913 | Author | | | | | |
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| Sylvia's marriage: a novel | | 1914 | Author | | | | | |
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| They call me Carpenter: a tale of the second coming | | 1922 | Author | | | | | |
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| An Upton Sinclair anthology | | 1934 | Author | | | | | |
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| Upton Sinclair presents William Fox | | 1933 | Author | | | | | |
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| The way out: what lies ahead for American | | 1933 | Author | | | | | |
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| What can de done about America's economic troubles? | | 1939 | Author | | | | | |
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| What God means to me: an attempt at a working religion | | 1936 | Author | | | | | |
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| What's the use of books | | 1927 | Author | | | | | |
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Public Domain Books