| Otto, Martina | Martina Otto | Actor | 1915 - 1925 | 7 | |
| Ozols, Jānis | Jānis Ozols | Actor | 1915 | 2 | |
| Ozolkāja, Kārlis | Kārlis Ozolkāja | Actor | 1914 - 1915 | 2 | |
| Oscàr, Martin | Martin Oscàr | Actor | 1914 | 1 | |
| Ohta, Sanjiro | Sanjiro Ohta | Translator | 1914 | 1 | |
| Ono, Shihoriko | Shihoriko Ono | Actor | 1914 | 1 | |
| Otterström, Birger | Birger Otterström | Actor | 1914 | 1 | |
| Odstrčilová, Liběna | Liběna Odstrčilová | Actor | 1913 - 1922 | 3 | |
| Orford, Cathleen | Cathleen Orford | Actor | 1913 - 1918 | 4 | |
| Ono, Masutaro | Masutaro Ono | Actor | 1913 | 1 | |
| O'Neill, Norman | Norman O'Neill | Composer | 1913 | 1 | |
| Orchardson, Yvonne Q. | Yvonne Q. Orchardson | Actor | 1913 | 1 | |
| Olsen, Otto | Otto Olsen | Actor | 1913 | 1 | |
| Outram, J., F. | J. F. Outram | Actor | 1913 | 1 | |
| Ogrizović, Milan | Milan Ogrizović | Translator | 1913 | 1 | |
| O'Connor, Kathleen | Kathleen O'Connor | Actor | 1912 | 1 | |
| Osborne, Nina | Nina Osborne | Actor | 1912 | 1 | |
| Osmarr, Lili | Lili Osmarr | Actor | 1911 - 1926 | 7 | |
| Owenberg-Lyche, Ragnhild | Ragnhild Owenberg-Lyche | Actor | 1911 - 1922 | 6 | 6 |
| Owen, George | George Owen | Actor | 1911 - 1912 | 5 | |
| Orska, Daisy | Daisy Orska | Actor | 1911 | 1 | |
| Ordężanka, Janina | Janina Ordężanka | Actor | 1911 | 1 | |
| Orczyńska, Mieczysława | Mieczysława Orczyńska | Actor | 1911 | 1 | |
| Olsen, Lauritz | Lauritz Olsen | Actor | 1911 | 1 | |
| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| Ott, Gisa | Gisa Ott | Actor | 1910 - 1941 | 9 | |
| Oswald, Richard | Richard Oswald | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Osterloh, Hildegard | Hildegard Osterloh | Actor | 1910 - 1916 | 15 | |
| Otto, Karl | Karl Otto | Actor | 1910 - 1911 | 2 | |
| Olden, Arno W. | Arno W. Olden | Actor | 1910 | 1 | |
| Odzhakov, Zhivko | Zhivko Odzhakov | Actor | 1910 | 1 | |
| Obreschkov, Todor | Todor Obreschkov | Actor | 1910 | 1 | |
| Odzhakova, Jurija | Jurija Odzhakova | Actor | 1910 | 1 | |
| Ostrowska, Franciszka | Franciszka Ostrowska | Actor | 1910 | 2 | |
| Osanai, Kaoru | Kaoru Osanai | Director | 1909 - 1928 | 6 | 1 |
| Oehlmann, Hans | Hans Oehlmann | Actor | 1909 | 1 | |
| O'Neil, Barry | Barry O'Neil | Director | 1909 | 1 | |
| Okada, Saburonosuke | Saburonosuke Okada | Designer | 1909 | 1 | |
| Ostužev, Aleksandr, Alekseevic | Aleksandr Alekseevic Ostužev | Actor | 1909 | 1 | |
| Okornicki, Kazimierz | Kazimierz Okornicki | Actor, Director | 1908 - 1922 | 7 | |
| Ogińska, Antonina | Antonina Ogińska | Actor | 1908 - 1910 | 3 | |
| Orloff, Nicholas | Nicholas Orloff | Actor | 1908 | 1 | 1 |
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