O
- Manuel A. Odría, Peruvian president (1953)
- Bernardo O'Higgins, Chilean independence leader (1909)
- Olaf V, Norwegian king (1967)
- João Carlos de Oliveira, athlete (1975)
- Francisco de Orellana, Spanish explorer (1991)
- Oscarito, actor and comedian (1990, 1998)
- Manuel Luís Osório, military officer (1958, 1970)
- Henrique Oswald, composer (1952)
- Teófilo Ottoni, politician and pacifier of Indians (2007) article in Portuguese
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