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)
Roy Orbison (1936–1988)
Ozzy Osbourne (1948)
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