O
| Oberman, Leo |
| Odenberg, Adolf |
| Oders, Alexander |
| Odliff, Ivan |
| Oleinikoff, Matfeus |
 | Olin, Axel Alexander |
| Ollgren, Arthur Arvid |
| Olsen, Charles John |
| Olsen, John |
| Oossoff, Fedor Michael |
| Orgeson, Christian |
| Orloff, Nicholas de |
| Orloff, Steven |
| Orlov, Julian |
| Oshenganoff, S. |
| Osipoff, Michael |
| Ospovat, Hyam |
| Ostrinko, Alik |
| Ouchirenko, John |
| Ozols, Julius |