Authors: d
- Humboldt, Alexander von 1769-1859
- Hume, David 1711-1776
- Humières, Robert d' 1868-1915
- Humphreys, Donald S. -
- Humphrey, S. D. (Samuel Dwight) 1823-1883
- Hungerford, Daniel E. -
- Hunt, Donaldson 1865-1941
- Hunter Blair, David Oswald, Sir 1853-1939
- Hunt, John Dixon 1936-
- Hunton, Addie W. 1866-1943
- Hurd, Richard 1720-1808
- Hurlbut, William D., Mrs. 1865-
- Hurst, Fannie 1889-1968
- Hurtado de Mendoza, Diego 1503-1575
- Hutchison, D. C. (David Chapel) 1869-1954
- Huth, Alfred Henry 1850-1910
- Hutten, Ulrich von 1488-1523
- Hutton, Mary A. (Mary Ann) 1862-1953
- Hyades, Paul 1847-1919
- Hyde, Douglas 1860-1949
- Hyde, William De Witt 1858-1917
- Ignatius, of Loyola, Saint 1491-1556
- Ignatius, Saint, Bishop of Antioch -
- Ilić, Dragutin J. 1858-1926
- Illinois. Department of Conservation -
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