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- O'Leary, Daniel Florencio (1801–1854)
- O'Leary, Juan Emiliano (1880–1968)
- O'Neal, Shaq(uille) Rashaun
- O'Reilly y Mcdowell, Alejandro (1723–1794)
- O, Genovevo de la (1876–1952)
- Oakeshott, Michael (1901–1990)
- Oasis Group
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- Obaldía, María Olimpiade (1891–1985)
- Obando y Bravo, Miguel (1926–)
- Obando, José María (1795–1861)
- Obin, Philomé (1892–1985)
- Objectivity in Ethics
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- Obregón Salido, Álvaro (1880–1928)
- Obregón, Alejandro (1920–1992)
