| Osborne Reynolds (Reynolds Osborne) English engineer and physicist. |
| OCTAVIO PAZ (Paz Octavio) Mexican poet and essayist. Nobel Prize in Literature 1990. |
| Olof Palm (Palme Olof) Prime Minister of Sweden. |
| OCHOA the North (Ochoa Severo) American biochemist, awarded the 1959 Nobel Prize in Physiology or Medicine (jointly with A. Kornberg) for the discovery of the mechanism of the biosynthesis of nucleic acids. |
| O `FAOLEYN Sean (O` Faolain, Sean) Irish writer. |
| OWEN Uilfed Edward Salter (Owen Wilfred Edward Salter) English poet, whose work is critically influenced the poetry of the 1930's. |
| OWEN Robert (Owen Robert) English theorist of socialism and industrialist. |
| OWEN Richard (Owen Richard) English anatomist and paleontologist. |
| OSMENYA Sergio (Osmea Sergio) President of the Philippines. |
| OSBORN, John James (Osborne John James) English dramatist. |
| Orcagna Andrea di Chone (Orcagna Andrea di Cione) Italian painter, sculptor and architect. |
| ORIO Vincent (Auriol Vincent) President of France in the years 1947-54. |
| O'Neill, Eugene (O `Neill Eugene) American playwright and Nobel Prize for Literature 1936. |
| OM Georg Simon (Ohm Georg Simon) German physicist. |
| OLDENBARNEVELT Yan Wang (Oldenbarnevelt Jan van) Dutch statesman. |
| OKSENSHERNA Axel Gustavsson (Oxenstierna Axel Gustavsson) Swedish statesman. |
| OCCAM William English scholastic philosopher, known today mainly through his proposed principle of economy of thought ( 'Occam's razor'). |
| OKINKLOSS Louis Stanton (Auchincloss Louis Stanton) American novelist, reflecting the life of American high society, especially its New York representative, since the turn of 19-20 centuries. |
| O `QAYSI Sean (O` Casey Sean) Irish playwright, controversial, radical clerics, the representative of the Irish literary revival of the early 20. |
| ODEH Wiest Hugh (Auden Wystan Hugh) Anglo-American poet, playwright, literary critic |
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