Authors: L
- Ignatius, Father, O.S.B. 1837-1908
- Ignatius, of Loyola, Saint 1491-1556
- Ikonen, Lauri 1888-1966
- Ilgen, William L. (William Lewis) 1862-1942
- Illica, Luigi 1857-1919
- Illingworth, Leslie Gilbert 1902-1979
- Imbert de Saint-Amand 1834-1900
- Immermann, Karl Leberecht 1796-1840
- Ingleby, Leonard Cresswell 1876-1923
- International Correspondence Schools -
- International Eugenics Congress (1st : 1912 : London) -
- International Labour Office -
- Inter-tribal Council of Louisiana -
- Ipsen, Ludvig Sandöe -
- Iribas, Juan L. -
- Irons, Lettie Artley -
- Irvine, Leigh H. (Leigh Hadley) 1863-1942
- Isaacson, Lauren Ann 1961-1986
- Ivie, Larry 1936-2014
- Jacks, L. P. (Lawrence Pearsall) 1860-1955
- Jackson, Leroy F. (Leroy Freeman) 1881-1958
- Jackson, Louis -
- Jackson, Louis E. 1877-1922
- Jacob, P. L. 1806-1884
- Jacobs, Harriet A. (Harriet Ann) 1813-1897
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