| Oswald, Richard | Richard Oswald (Richard Oswald) | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Ott, Gisa | Gisa Ott (Gisa Ott) | Actor | 1910 - 1941 | 9 | |
| Orska, Daisy | Daisy Orska (Daisy Orska) | Actor | 1911 | 1 | |
| Ordężanka, Janina | Janina Ordężanka (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 | |
| Owen, George | George Owen | Actor | 1911 - 1912 | 5 | |
| Owenberg-Lyche, Ragnhild | Ragnhild Owenberg-Lyche (Ragnhild Owenberg-Lyche) | Actor | 1911 - 1922 | 6 | 6 |
| Osmarr, Lili | Lili Osmarr (Lili Osmarr) | Actor | 1911 - 1926 | 7 | |
| O'Connor, Kathleen | Kathleen O'Connor (Kathleen O'Connor) | Actor | 1912 | 1 | |
| Osborne, Nina | Nina Osborne | Actor | 1912 | 1 | |
| Ono, Masutaro | Masutaro Ono (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 | |
| Orford, Cathleen | Cathleen Orford (Cathleen Orford) | Actor | 1913 - 1918 | 4 | |
| Odstrčilová, Liběna | Liběna Odstrčilová (Liběna Odstrčilová) | Actor | 1913 - 1922 | 3 | |
| Oscàr, Martin | Martin Oscàr (Martin Oscàr) | Actor | 1914 | 1 | |
| Ohta, Sanjiro | Sanjiro Ohta (Sanjiro Ohta) | Translator | 1914 | 1 | |
| Ono, Shihoriko | Shihoriko Ono (Shihoriko Ono) | Actor | 1914 | 1 | |
| Otterström, Birger | Birger Otterström | Actor | 1914 | 1 | |
| Ozolkāja, Kārlis | Kārlis Ozolkāja | Actor | 1914 - 1915 | 2 | |
| Ozols, Jānis | Jānis Ozols (Jānis Ozols) | Actor | 1915 | 2 | |
| Otto, Martina | Martina Otto (Martina Otto) | Actor | 1915 - 1925 | 7 | |
| Osis, K. | K. Osis (K. Osis) | Actor | 1916 | 1 | |
| Okornicka (Miłosz), Helena | Helena Okornicka (Miłosz) (Helena Okornicka (Miłosz)) | Actor | 1916 | 1 | |
| O'Connor, Loyola | Loyola O'Connor | Actor | 1916 | 1 | |
| Orth, Hubert | Hubert Orth (Hubert Orth) | Actor | 1916 - 1917 | 2 | |
| Ott, Rita | Rita Ott (Rita Ott) | Actor | 1917 | 1 | |
| O'Brien, Terence | Terence O'Brien | Actor | 1917 | 1 | |
| Otto, Franz | Franz Otto | Actor | 1917 - 1924 | 3 | |
| Ostwald, Frank | Frank Ostwald (Frank Ostwald) | Actor | 1917 - 1937 | 5 | |
| Oesterheld, Heinrich | Heinrich Oesterheld (Heinrich Oesterheld) | Actor | 1918 | 2 | |
| Orth, Frk. | Frk. Orth (Frk. Orth) | Actor | 1918 | 2 | |
| Opitz, Felicitas | Felicitas Opitz (Felicitas Opitz) | Actor | 1918 - 1919 | 2 | |
| Olsen, Tonny | Tonny Olsen (Tonny Olsen) | Actor | 1918 - 1924 | 5 | |
| Osten, Susanne | Susanne Osten (Susanne Osten) | Actor | 1919 | 1 | |
| Oettinger, Liesel | Liesel Oettinger (Liesel Oettinger) | Actor | 1919 | 1 | |
| Oehler, Hans | Hans Oehler (Hans Oehler) | Actor | 1919 | 1 | |
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