| Name | Functions | Event Dates  | Events | Resources | ||
|---|---|---|---|---|---|---|
| Yrjö Ollila | Costume Designer, Designer | 1930 | 2 | |||
| Hans Otto | Actor | 1929 | 1 | |||
| Natalia Ortiz | Actor | 1929 | 1 | |||
| Olga B. Országhová | Actor | 1929 | 1 | |||
| Bernard Ostertag | Actor | 1929 | 1 | |||
| Gearoid O'Lochlainn | Actor, Translator | 1928 - 2009 | 2 | |||
| Régis Outin | Actor | 1928 - 1978 | 4 | 1 | ||
| Nelly Oosthout | Actor | 1928 - 1930 | 2 | |||
| Esperanza Ortiz | Actor | 1928 - 1929 | 9 | |||
| Mizuho Oka | Actor | 1928 | 1 | |||
| - Oszke | Actor | 1928 | 1 | |||
| - Ondra | Actor | 1928 | 1 | |||
| Erich Oltersdorf | Actor | 1928 | 1 | |||
| L. Katherine Olsen | Actor | 1928 | 1 | |||
| Einar Oen | Actor | 1928 | 1 | 1 | ||
| - Obreschkov | Actor | 1928 | 1 | |||
| Lura Orsborn | Actor | 1928 | 1 | |||
| Dysart O'Dea | Actor | 1928 | 1 | |||
| Walter Outler | Actor | 1928 | 2 | |||
| Ole Oftedahl | Actor, Dancer | 1928 | 2 | |||
| Gudrun Olsen | Dancer | 1928 | 1 | |||
| C.M. Osman | Actor | 1928 | 1 | 1 | ||
| E.H.L. Osman | Actor | 1928 | 1 | |||
| Mala Obendorf | Actor | 1928 | 1 | |||
| Reinhold Ockel | Designer, Director | 1927 - 1942 | 2 | |||
| Hugh Owen | Designer | 1927 | 1 | |||
| Moroni Olsen | Actor | 1927 | 1 | |||
| Selmer Olson | Actor | 1927 | 1 | |||
| George Offerman, Jr. | Actor | 1927 | 1 | |||
| Alfred Osmund | Actor | 1926 - 1933 | 3 | |||
| Reginald Owen | Actor | 1926 - 1932 | 2 | |||
| Melanie Olden | Actor | 1926 | 1 | |||
| Jakov Osipovič | Actor | 1926 | 1 | |||
| Kai Orlamundt | Actor | 1926 | 1 | |||
| Eunice Osborne | Actor | 1926 | 1 | |||
| Armand Ozory | Actor | 1925 - 1952 | 8 | |||
| Miyakichi Ono | Actor | 1925 | 1 | |||
| W. F. Oakeshott | Actor | 1925 | 1 | |||
| Lilian Oldland | Actor | 1925 | 1 | |||
| Charles Otis | Actor | 1925 | 1 | |||
| Maria Olska | Actor | 1925 | 1 | |||
| Lydia Opøien | Actor | 1923 - 2006 | 13 | 1 | ||