Authors: H.
- Hutton, J. H. (John Henry) 1885-1968
- Hutton, Richard Holt 1826-1897
- Hutton, William Holden 1860-1930
- Huxley, Thomas Henry 1825-1895
- Huygens, Constantijn 1596-1687
- Hyatt, Alfred H. (Alfred Henry) 1871-1911
- Hyndman, H. M. (Henry Mayers) 1842-1921
- Inglis, Henry D. (Henry David) 1795-1835
- Inglis, W. H. -
- Ingoldsby, Thomas 1788-1845
- Ingraham, J. H. (Joseph Holt) 1809-1860
- Ingram, John Henry 1842-1916
- Ingram, William H. 1877-
- Inhülsen, Otto W. H. 1868-
- Inman, Herbert -
- Ireland, W. H. (William Henry) 1777-1835
- Irvine, Leigh H. (Leigh Hadley) 1863-1942
- Irving, H. B. (Henry Brodribb) 1870-1919
- Irwin, H. T. (Henry Thomas Johnson) -1978
- Isings, J. H. 1884-1977
- Jackson, Helen Hunt 1830-1885
- Jackson, William H. -
- Jackson, William Henry 1843-1942
- Jacob, Edward Henry -
- Jacobi, H. D. -
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