| O'Shea, James | James O'Shea | Actor | 1905 | 1 | |
| Onno, Ferdinand | Ferdinand Onno (Ferdinand Onno) | Actor | 1904 - 1938 | 9 | |
| Orlik, Stanisław | Stanisław Orlik (Stanisław Orlik) | Actor | 1904 - 1924 | 4 | |
| Orliński, Janusz | Janusz Orliński (Janusz Orliński) | Actor | 1904 - 1916 | 9 | |
| Oehlschläger, Anna | Anna Oehlschläger (Anna Oehlschläger) | Actor | 1904 - 1908 | 2 | |
| Oberländer, Hans | Hans Oberländer (Hans Oberländer) | Director | 1904 - 1908 | 2 | |
| Ormbee, Helen | Helen Ormbee (Helen Ormbee) | Actor | 1904 | 1 | |
| Oaker, Jane | Jane Oaker (Jane Oaker) | Actor | 1904 | 1 | |
| O'Neill, Kathleen | Kathleen O'Neill (Kathleen O'Neill) | Actor | 1904 | 1 | |
| Ordonówna, Władysława | Władysława Ordonówna (Władysława Ordonówna) | Actor | 1904 | 1 | |
| Orlenev, Pavel | Pavel Orlenev | Actor, Director | 1903 - 1923 | 7 | |
| Orliński, Janusz | Janusz Orliński (Janusz Orliński) | Actor | 1903 - 1909 | 4 | |
| Ozoliņa, Marta | Marta Ozoliņa (Marta Ozoliņa) | Actor | 1903 | 1 | |
| Otis, Elita Proctor | Elita Proctor Otis (Elita Proctor Otis) | Actor | 1903 | 13 | |
| Ottesen, Rasmus | Rasmus Ottesen (Rasmus Ottesen) | Actor | 1902 - 1926 | 18 | |
| Oikonomou, Thomas | Thomas Oikonomou (Thomas Oikonomou) | Actor, Director | 1902 - 1926 | 121 | |
| Ohlsen, Castora | Castora Ohlsen (Castora Ohlsen) | Actor | 1902 - 1909 | 3 | |
| Oliver, Federico | Federico Oliver | Director | 1902 - 1908 | 5 | |
| Olsen, Hans | Hans Olsen (Hans Olsen) | Actor | 1902 - 1903 | 17 | |
| Olden, Hertha | Hertha Olden (Hertha Olden) | Actor | 1902 | 2 | |
| Opel, Rudolf | Rudolf Opel (Rudolf Opel) | Actor | 1901 - 1910 | 3 | |
| Orska, Alina(?) | Alina(?) Orska (Alina(?) Orska) | Actor | 1901 - 1903 | 2 | |
| Ottmann, Victor | Victor Ottmann (Victor Ottmann) | Translator | 1901 - 1902 | 9 | 1 |
| Olsen, Albert | Albert Olsen (Albert Olsen) | Actor | 1901 | 6 | |
| Olsen, Marie | Marie Olsen (Marie Olsen) | Actor | 1901 | 1 | |
| Orwidowa, Jadwiga | Jadwiga Orwidowa (Jadwiga Orwidowa) | Actor | 1901 | 1 | |
| Oddvar, August | August Oddvar (August Oddvar) | Actor | 1900 - 1954 | 108 | |
| Opsann, Aksel | Aksel Opsann (Aksel Opsann) | Actor | 1900 - 1928 | 66 | |
| Ol'čeva, M. | M. Ol'čeva (M. Ol'čeva) | Actor | 1900 - 1924 | 6 | |
| O'Neil, Nance | Nance O'Neil (Nance O'Neil) | Actor | 1900 - 1917 | 23 | |
| Ostheim, Minna | Minna Ostheim | Actor | 1900 - 1908 | 4 | |
| Ormonde, Eugene | Eugene Ormonde (Eugene Ormonde) | Actor | 1900 - 1904 | 4 | |
| Ormond, Margarethe | Margarethe Ormond (Margarethe Ormond) | Actor | 1900 - 1901 | 2 | |
| Oscar, Harry | Harry Oscar (Harry Oscar) | Director | 1900 | 1 | |
| Orth, Theo | Theo Orth | Actor | 1900 | 1 | |
| Oehmig, Franz | Franz Oehmig | Actor | 1900 | 1 | |
| Olivar, Mr | Mr Olivar | Actor | 1900 | 2 | |
| Owerłło, Paweł | Paweł Owerłło (Paweł Owerłło) | Actor | 1899 - 1905 | 2 | |
| Ockert, Otto | Otto Ockert (Otto Ockert) | Actor | 1899 | 1 | |
| Otto, Alex | Alex Otto (Alex Otto) | Actor, Director, Playwright | 1898 - 1934 | 21 | |
| Otto-Körner, Margarethe | Margarethe Otto-Körner (Margarethe Otto-Körner) | Actor | 1898 - 1929 | 13 | |
| Oskar, Otto | Otto Oskar | Actor | 1898 - 1916 | 12 | |
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