| O `QAYSI Sean (O` Casey Sean) Irish playwright, controversial, radical clerics, the representative of the Irish literary revival of the early 20. |
| 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. |
| OCCAM William English scholastic philosopher, known today mainly through his proposed principle of economy of thought ( 'Occam's razor'). |
| OKSENSHERNA Axel Gustavsson (Oxenstierna Axel Gustavsson) Swedish statesman. |
| OLDENBARNEVELT Yan Wang (Oldenbarnevelt Jan van) Dutch statesman. |
| OM Georg Simon (Ohm Georg Simon) German physicist. |
| O'Neill, Eugene (O `Neill Eugene) American playwright and Nobel Prize for Literature 1936. |
| ORIO Vincent (Auriol Vincent) President of France in the years 1947-54. |
| Orcagna Andrea di Chone (Orcagna Andrea di Cione) Italian painter, sculptor and architect. |
| OSBORN, John James (Osborne John James) English dramatist. |
| OSMENYA Sergio (Osmea Sergio) President of the Philippines. |
| OWEN Richard (Owen Richard) English anatomist and paleontologist. |
| OWEN Robert (Owen Robert) English theorist of socialism and industrialist. |
| OWEN Uilfed Edward Salter (Owen Wilfred Edward Salter) English poet, whose work is critically influenced the poetry of the 1930's. |
| O `FAOLEYN Sean (O` Faolain, Sean) Irish writer. |
| 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. |
| Olof Palm (Palme Olof) Prime Minister of Sweden. |
| OCTAVIO PAZ (Paz Octavio) Mexican poet and essayist. Nobel Prize in Literature 1990. |
| Osborne Reynolds (Reynolds Osborne) English engineer and physicist. |
| Ottorino Respighi (Respighi Ottorino) Italian composer. |
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