- Ripley Hitchcock, Author/Editor (1857–1918; member, 1895–1918)
- Roswell D. Hitchcock, Clergyman (1817–1887; member, 1874–1887)
- Thomas Hitchcock, Law/Financial Journalist (1831–1910; member, 1859–1910)
- George Hoadly, Lawyer/Governor of Ohio (1826–1902; member, 1888–1900)
- Henry W. Hodge, Civil Engineer (1865–1919; member, 1904–1919)
- Richard Hodgson, Secretary, Society for Psychical Research (1855–1905; member, 1894–1905)
- Robert Hoe II, Manufacturer (Printing Press) (1815–1884; member, 1862–1884)
- Robert Hoe III, Manufacturer (Printing Press) (1839–1909; member, 1877–1909)
- Charles B. Hoffman, Banker (1827–1892; member, 1887–1892)
- Eugene A. Hoffman, Dean, Theological Seminary (1829–1902; member, 1882–1902)
- P. Rogers Hoffman, Physician (1806–1873; member, 1865–1873)
- Richard von Hoffman, Banker/Nobleman (1837–1909; member, 1861–1876)
- Samuel V. Hoffman, Johns Hopkins University Observatory (1866–1942; member, 1893–1942)
- Wickham Hoffman, Army Officer/Diplomat (1821–1900; member, 1857–1860s)
- William Bayard Hoffman, Banker (1817–1880; member, 1851–1880)
- Bernard Hoffmann, Engineer (1874–1949; member, 1915–1947)
- Levi Holbrook, Geologist (1836–1922; member, 1887–1922)
- John G. Holbrooke, Insurance/Mastodon Gold Mining (1814–1897; member, 1866–1868)
- Edward S. Holden, Astronomer (1846–1914; member, 1900–1914)
- Edwin B. Holden, Merchant/Coal Dealer (1861–1906; member, 1897–1906)
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