- Hamilton Odell, Lawyer (1834–1922; member, 1900–1922)
- Hanns Oertel, Professor of Philology (1868–1952; member, 1910–1913)
- Thomas S. Officer, Artist (1810–1859; member, 1847–unknown)
- Alfred Ogden, Insurance (1815–1898; member, 1858–1862)
- Charles H. Ogden, Merchant (1813–1874; member, 1864–1874)
- David B. Ogden, Lawyer (1849–1923; member, 1895–1923)
- 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)
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