Otto I. der Große (912–973)
George Orwell (1903–1950)
Robert Oppenheimer (1904–1967)
Laurence Olivier (1907–1989)
Jesse Owens (1913–1980)
Yoko Ono (1933)
Roy Orbison (1936–1988)
Uschi Obermaier (1946)
Ozzy Osbourne (1948)
Uwe Ochsenknecht (1956)
Barack Obama (1961)
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