- Edward Oothout, Broker (1834–1903; member, 1863–1903)
- Leonard E. Opdycke, Author (1858–1914; member, 1903–1914)
- George Opdyke, Mayor of New York City (1805–1880; member, 1859–1860s)
- John Ordronaux, Surgeon/Alienist/Philanthropist (1830–1908; member, 1856–1865)
- Samuel H. Ordway, Lawyer (1860–1934; member, 1905–1934)
- Alexander E. Orr, Merchant (1831–1914; member, 1901–1914)
- Henry Fairfield Osborn, Professor/Paleontologist (1857–1935; member, 1893–1932)
- William Church Osborn, Lawyer (1862–1951; member, 1896–1951)
- William H. Osborn, Railroad Official (1820–1894; member, 1854–1855)
- Thomas Mott Osborne, Forest, Fish, and Game Commissioner/Prison Reformer (1859–1926; member, 1911–1926)
- James R. Osgood, Publisher (1836–1892; member, 1866–1892)
- Samuel Osgood, Clergyman (1812–1880; member, 1863–1880)
- Fessenden Nott Otis, Urologist (1825–1900; member, 1861–1895)
- George K. Otis, Mail Contractor (1827–1890; member, 1867–1889)
- William K. Otis, Physician (1860–1906; member, 1888–1906)
- Oswald Ottendorfer, Editor, Staats-Zeitung (1826–1900; member, 1872–1900)
- Lucien Oudin, Lawyer (1854–1929; member, 1891–1929)
- Maurice A. Oudin, Manager, Foreign Department, General Electric Company (1866–1929; member, 1918–1929)
- E. H. Outerbridge, Merchant (1860–1932; member, 1911–1932)
- Henry Allen Overstreet, Educator (1875–1970; member, 1914–1916)
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