Otto I. der Große (912–973)George Orwell (1903–1950)Robert Oppenheimer (1904–1967)Aristoteles Onassis (1906–1975)Laurence Olivier (1907–1989)Peter O'Toole (1932–2013)Yoko Ono (1933)Roy Orbison (1936–1988)Abi Ofarim (1937–2018)Uwe Ochsenknecht (1956)Barack Obama (1961)DJ Ötzi (1971)O
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- Otis, Elisha Graves
- Otlet, Paul
- O'Toole, Peter
- Ottke, Sven
- Otto I. der Große (HRR)
- Otto II. (HRR)
- Otto III. (HRR)
- Otto-Peters, Louise
- Otto, Frei
- Otto, Kristin
- Otto, Nicolaus August
- Otto, Sylke
- Otto, Werner