- Gouverneur M. Ogden, Lawyer (1814–1884; member, 1868–1884)
- Robert C. Ogden, Merchant (1836–1913; member, 1899–1913)
- Rollo Ogden, Editor (1856–1937; member, 1902–1937)
- William B. Ogden, Politician/Mayor of Chicago/Railroad (1805–1877; member, 1857–1877)
- Clinton Ogilvie, Artist (1838–1900; member, 1887–1900)
- Stephen H. Olin, Lawyer (1847–1925; member, 1875–1925)
- A. H. Olmsted, Banker (1842–1929; member, 1893–1929)
- Frederick Law Olmsted, Landscape Architect/Journalist (1822–1903; member, 1859–1903)
- Frederick Law Olmsted Jr., Landscape Architect (1870–1957; member, 1904–1957)
- John Charles Olmsted, Landscape Gardener (1852–1920; member, 1898–1920)
- George Harwood Olney, Lawyer (1872–1950; member, 1915–1950)
- Peter B. Olney, Lawyer (1843–1922; member, 1874–1922)
- Robert Morrison Olyphant, Importer/Railroad Officer (1824–1918; member, 1863–1876)
- 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)
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