Otto I. der Große (912–973)
George Orwell (1903–1950)
Robert Oppenheimer (1904–1967)
Aristoteles Onassis (1906–1975)
Laurence Olivier (1907–1989)
Jesse Owens (1913–1980)
Yoko Ono (1933)
Ozzy Osbourne (1948)
Uwe Ochsenknecht (1956)
Barack Obama (1961)
Michelle Obama (1964)
Mesut Özil (1988)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