| Oehler, Hans | Hans Oehler | Actor | 1919 | 1 | |
| Otto-Morgenstern, Martina | Martina Otto-Morgenstern | Actor | 1920 - 1921 | 2 | |
| Ott, Magdalena | Magdalena Ott | Actor | 1919 | 2 | |
| Otto-Osmarr, Lili | Lili Otto-Osmarr | Actor | 1920 | 2 | |
| Olsen, Hanns | Hanns Olsen | Actor | 1921 - 1931 | 4 | |
| Oppermann, Leonore | Leonore Oppermann | Actor | 1919 - 1922 | 3 | |
| Osten, Käte | Käte Osten | Actor | 1919 - 1923 | 3 | |
| Ozory, Armand | Armand Ozory | Actor | 1925 - 1952 | 8 | |
| Olden, Melanie | Melanie Olden | Actor | 1926 | 1 | |
| Oszke, - | - Oszke | Actor | 1928 | 1 | |
| Ondra, - | - Ondra | Actor | 1928 | 1 | |
| Oltersdorf, Erich | Erich Oltersdorf | Actor | 1928 | 1 | |
| Otto, Hans | Hans Otto | Actor | 1929 | 1 | |
| Ostermann, Ferdinand | Ferdinand Ostermann | Actor | 1933 | 1 | |
| Ott, Rudolf | Rudolf Ott | Actor | 1935 | 1 | |
| Obonya, Hanns | Hanns Obonya | Actor | 1935 | 1 | |
| Overlack, Olga | Olga Overlack | Actor | 1938 | 1 | |
| Oppel, Günther | Günther Oppel | Actor | 1938 | 1 | |
| Olszewski, Reinhold | Reinhold Olszewski | Actor | 1938 | 1 | |
| Obermaier, Marta | Marta Obermaier | Actor | 1947 | 1 | |
| Oldham, Michael | Michael Oldham | Actor | 1942 - 1948 | 2 | |
| Oberländer, Horst | Horst Oberländer | Actor | 1949 | 1 | |
| Olmesdahl, Fritz | Fritz Olmesdahl | Actor | 1950 | 1 | |
| Ol'čeva, M. | M. Ol'čeva | Actor | 1900 - 1924 | 6 | |
| Ormonde, Eugene | Eugene Ormonde | Actor | 1900 - 1904 | 4 | |
| Olsen, Albert | Albert Olsen | Actor | 1901 | 6 | |
| Olsen, Marie | Marie Olsen | Actor | 1901 | 1 | |
| Orska, Alina(?) | Alina(?) Orska | Actor | 1901 - 1903 | 2 | |
| Orwidowa, Jadwiga | Jadwiga Orwidowa | Actor | 1901 | 1 | |
| Ohlsen, Castora | Castora Ohlsen | Actor | 1902 - 1909 | 3 | |
| Oscàr, Martin | Martin Oscàr | Actor | 1914 | 1 | |
| Olsen, Hans | Hans Olsen | Actor | 1902 - 1903 | 17 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1903 - 1909 | 4 | |
| Ozoliņa, Marta | Marta Ozoliņa | Actor | 1903 | 1 | |
| Otis, Elita Proctor | Elita Proctor Otis | Actor | 1903 | 13 | |
| O'Neil, Nance | Nance O'Neil | Actor | 1900 - 1917 | 23 | 1 |
| Ormbee, Helen | Helen Ormbee | Actor | 1904 | 1 | |
| Oaker, Jane | Jane Oaker | Actor | 1904 | 1 | 1 |
| O'Neill, Kathleen | Kathleen O'Neill | Actor | 1904 | 1 | |
| Ordonówna, Władysława | Władysława Ordonówna | Actor | 1904 | 1 | |
| Otis, Edith | Edith Otis | Actor | 1905 | 1 | |
| Orlandini, Leo | Leo Orlandini | Actor | 1892 - 1924 | 12 | |
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