- Obstbaum, Ludwig
- Odessor, Maximilian
- Oldak, Jospeh
- Ollendorf, Günther
- Olschky, Alfred
- Oppenheim, Berthold
- Oppenheim, David
- Oppenheim, Ernst
- Oppenheim, Eugen
- Oppenheim, Fritz
- Oppenheim, Hirsch
- Oppenheim, Jacob
- Oppenheim, Jonas
- Oppenheim, Max
- Oppenheim, Moritz
- Oppenheim, Paul
- Oppenheim, Stanislaus
- Oppenheimer, Adolph
- Oppenheimer, Albert
- Oppenheimer, Ernst
- Oppenheimer, Ernst
- Oppenheimer, Fritz
- Oppenheimer, geb. Levin, Rosalie
- Oppenheimer, Iwan
- Oppler, Siegmund
- Oscherowitz, Rudolph
- Ostheimer, Julius
- Ostwald, Wilhelm
- Oswald, Gustav