| Obolensky, Alexander Mitrofanovich President SDPR. Co-Chair of the Social Democratic Union. |
| Obolensky, Leonid Egorovich Writer |
| Obolensky, Nikolai Honorary member of the Russia Academy of Architecture and Building Sciences, Honored Architect of Russia |
| Oborin Alexander Hero of the Soviet Union |
| OBRAYAN John football player |
| Obreskov Alexei Mikhailovich Prominent Russian diplomat |
| Obruchev Nikolai War activist and writer |
| Obruchev Vladimir Afanasievich Academician of the USSR, Hero of Socialist Labor, laureate of the Lenin and State prizes |
| OBUKHOV Alexander Afanasievich Hero of the Soviet Union |
| OBUT Keizo (Obuchi Keizo) Prime Minister of Japan. |
| OCCAM William English scholastic philosopher, known today mainly through his proposed principle of economy of thought ( 'Occam's razor'). |
| OCHOA (Ochoa), North Spanish-American biochemist and Nobel Prize in Physiology or Medicine, 1959 |
| 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. |
| Octave Chanute (Chanute Octave) American engineer, one of the pioneers of aeronautics. |
| Octavian Augustus The first Roman emperor |
| OCTAVIO PAZ (Paz Octavio) Mexican poet and essayist. Nobel Prize in Literature 1990. |
| OCTOBER Mariya Hero of the Soviet Union |
| Odegova Maria Aktis |
| ODEH Wiest Hugh (Auden Wystan Hugh) Anglo-American poet, playwright, literary critic |
| Odette / Holmes / Singer |
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