| Slason Thompson | 1849–1935 | 2 |
| Thompson, William, Colonel | 1846–1934 | 1 |
| Thomson, A. T., Mrs. | 1797–1862 | 6 |
| Alexis Thomson | 1863–1924 | 1 |
| Basil Thomson | 1861–1939 | 1 |
| Edward William Thomson | 1849–1924 | 1 |
| H. Byerley (Henry Byerley) Thomson | 1822–1867 | 1 |
| Hugh Thomson | 1860–1920 | 1 |
| J. Arthur (John Arthur) Thomson | 1861–1933 | 2 |
| J. Pringle (James Pringle) Thomson | 1889–1916 | 1 |
| James Thomson | 1834–1882 | 1 |
| Ninian Hill Thomson | 1830–1921 | 1 |
| Henry David Thoreau | 1817–1862 | 7 |
| Ashley Horace Thorndike | 1871–1933 | 1 |
| James Frederic Thorne | born 1871 | 1 |
| Gudrun Thorne-Thomsen | born 1873 | 1 |
| William Thomas Thornton | 1813–1880 | — |
| Willard Thorp | 1899–1990 | 1 |
| Benjamin Thorpe | 1782–1870 | 1 |
| Clarence De Witt Thorpe | born 1887 | 1 |
| Three Initiates | 1862–1932 | 1 |
| Thring, Henry Thring, Baron | 1818–1907 | — |
| Thomas G. (Thomas George) Thrum | 1842–1932 | 1 |
| Thure de Thulstrup | 1848–1930 | 1 |
| Violetta Thurstan | 1879–1978 | 1 |
| E. Temple (Ernest Temple) Thurston | 1879–1933 | 1 |
| I. T. (Ida Treadwell) Thurston | 1848–1918 | 2 |
| Katherine Cecil Thurston | 1875–1911 | 3 |
| Zoltán Thury | 1870–1906 | 1 |
| Augustus J. Thébaud | 1807–1885 | 1 |
| Thérèse, de Lisieux, Saint | 1873–1897 | 1 |
| Josiah Blake Tidwell | 1870–1946 | 2 |
| Dorothea Tieck | 1799–1841 | 2 |
| Ludwig Tieck | 1773–1853 | — |
| Eunice Tietjens | 1884–1944 | 1 |
| J. H. (John Henry) Tilden | 1851–1940 | 1 |
| William T. (William Tatem) Tilden | 1893–1953 | 1 |
| Mary Wilder Tileston | 1843–1934 | 1 |
| F. C. (Frederick Colin) Tilney | 1870–1951 | 3 |
| George Henry Tilton | born 1845 | 1 |
| Elizabeth Weston Timlow | 1861–1931 | 1 |
| Felix Timmermans | 1886–1947 | 1 |
| Henry Timrod | 1828–1867 | 1 |
| Katherine Augusta Westcott Tingley | 1847–1929 | 1 |
| Chauncey Brewster Tinker | 1876–1963 | 2 |
| Léon de Tinseau | 1844–1921 | 2 |
| Henry C. Tinsley | 1834–1902 | 1 |
| Albert Tissandier | 1839–1906 | 1 |
| Gaston Tissandier | 1843–1899 | 1 |
| S. A. D. (Samuel Auguste David) Tissot | 1728–1797 | 1 |
| Victor Tissot | 1845–1917 | 1 |
| Walter Tittle | 1883–1966 | 1 |
| Otto Tiuppa | 1872–1914 | 1 |
| Alexis de Tocqueville | 1805–1859 | 4 |
| Mabel Loomis Todd | 1856–1932 | 3 |
| I. (Isaac) Todhunter | 1820–1884 | 1 |
| John Todhunter | 1839–1916 | 1 |
| Aurelio Tolentino | 1867–1915 | 1 |
| Nicolau Tolentino | 1740–1811 | 1 |
| L. M. Tolman | born 1875 | 1 |
| Tolstoi, Ilia Lvovich, graf | 1866–1933 | 1 |
| Tolstoy, Leo, graf | 1828–1910 | 30 |
| Rudolf Tombo | 1875–1914 | 1 |
| Floyd W. (Floyd Williams) Tomkins | 1850–1932 | 1 |
| Everett T. (Everett Titsworth) Tomlinson | 1859–1931 | 1 |
| H. M. (Henry Major) Tomlinson | 1873–1958 | 2 |
| Paul G. (Paul Greene) Tomlinson | born 1888 | 1 |
| Herbert W. (Herbert Winckworth) Tompkins | born 1867 | 1 |
| Mary Van Arsdale Tongue | born 1891 | 1 |
| William Wallace Tooker | 1848–1917 | 1 |
| Frederick R. Toombs | born 1879 | 1 |
| Jean Toomer | 1894–1967 | 1 |
| Zacharias Topelius | 1818–1898 | 3 |
| Charles Torquet | 1864–1938 | 1 |
| Carlos Arturo Torres | 1867–1911 | 1 |
| Bradford Torrey | 1843–1912 | 1 |
| Totius | 1877–1953 | 1 |
| Gustave Toudouze | 1847–1904 | 1 |
| Paul Jean Toulet | 1867–1920 | 2 |
| Albion Winegar Tourgée | 1838–1905 | 1 |