- Ibn Tufail, Muhammad ibn 'Abd al-Malik (1, 1105 to 1185)
- Ibsen, Henrik (23, 1828 to 1906)
- Ignatius of Antioch, Saint (1, 35 to 117)
- Ihne, Wilhelm (1, 1821 to 1902)
- Iles, George (9, 1852 to 1942)
- Imbert de Saint-Amand, Arthur-Léon (1, 1824 to 1900)
- Inchbald, Elizabeth (4, 1753 to 1821)
- Inchfawn, Fay (2, 1880 to 1978)
- Ingelow, Jean (6, 1820 to 1897)
- Ingersoll, Robert G. (22, 1833 to 1899)
- Ingersoll, Ernest (3, 1852 to 1946)
- Inglis, James (1, 1845 to 1908)
- Ingraham, Mary Kinley (1, 1874 to 1949)
- Ingraham, Prentiss (2, 1843 to 1904)
- Ingram, Eleanor M. (2, 1886 to 1921)
- Ingram, John Henry (2, 1842 to 1916)
- Initiates, The Three (2)
- Inman, Henry (1, 1837 to 1899)
- Inman, Herbert Escott (1, 1860 to 1915)
- Innes, A. Taylor (1, 1833 to 1912)
- International Committee of the Red Cross (1, 1863)
- International Military Tribunal (1)
- Irenaeus (2, 2nd cent to c. 202 CE)
- Iriarte, Tomás de (1, 1750 to 1791)
- Ironside, Henry Allan (1, 1876 to 1951)
- Ironside, John (2, 1866 to 1945)
- Irving, Washington (22, 1783 to 1859)
- Irwin, Florence (1, 1869 to post-1947)
- Irwin, Wallace (1, 1875 to 1959)
- Irwin, Will (2, 1873 to 1948)
- Isaacs, Abram S. (1, 1851 to 1920)
- Isaacs, Jorge (1, 1837 to 1895)
- Isham, Frederic Stewart (1, 1866 to 1922)
- Ishikawa, Takuboku (1, 1886 to 1912)
- Itō, Sachio (2, 1864 to 1913)
- Iuvenalis, Decimus Iunius (2, 2nd Cent.)
- Ivanov, Georgy (1, 1894 to 1958)
- Ivanov, Vyacheslav (1, 1866 to 1949)
- Ives, Charles (1, 1874 to 1954)
- Ives, Sarah Noble (1, 1864 to 1944)
- Izumi, Kyōka (2, 1873 to 1939)