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- OenophiliaOenophilia ( EE-nə-FIL-ee-ə; from Greek for 'love of wine', see oinos and -philia), in the
- Office of Chief Medical Examiner of the City of New YorkThe Office of Chief Medical Examiner of the City of New York (OCME) is a department within
- Okwui EnwezorNigerian-born American curator (1963–2019)
- Oliver E. WilliamsonAmerican economist (1932–2020)
- Oronce FineFrench mathematician and cartographer
- Oscar BrowningBritish educationalist and historian
- Ostfriedhof (Munich)The Ostfriedhof (German for 'Eastern Cemetery') is a cemetery in Munich, situated in the d
- Otto JahnOtto Jahn (German: ; 16 June 1813, in Kiel – 9 September 1869, in Göttingen), was a German
- Otto NeurathAustrian economist, philosopher and sociologist (1882–1945)
- Otto RankAustrian psychoanalyst (1884–1939)