Authors: St
- Ilchester, Giles Stephen Holland Fox-Strangways, Earl of 1874-1959
- Illinois State Geological Survey -
- Ingalls, E. S. (Eleazer Stillman) 1820-1879
- Ingersoll, R. Sturgis (Robert Sturgis) 1891-
- Institute of Home Economics (U.S.) -
- International Joint Commission -
- Ipolyi, Arnold 1823-1886
- Iraq Study Group (U.S.) -
- Isham, Frederic Stewart 1866-1922
- Jackson, Andrew 1767-1845
- Jameson, Helen Follett 1873-
- Janes, Edmund S. (Edmund Storer) 1807-1876
- Jarvis, Stinson 1854-1926
- Jeans, J. Stephen (James Stephen) 1846-1913
- Jefferson, Thomas 1743-1826
- Jet Propulsion Laboratory (U.S.) -
- Jevons, William Stanley 1835-1882
- Johns, Cecil Starr -
- Johnson, Andrew 1808-1875
- Johnson, Harold Stanley -
- Johnson, Lyndon B. (Lyndon Baines) 1908-1973
- Johnson, Stanley C. (Stanley Currie) 1878-
- Jones, Alfred Stowell 1832-1920
- Jones, Easley S. (Easley Stephen) 1884-1947
- Jones, Steven E. 1949-
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