| Orling, E. | E. Orling | Designer | 1895 - 1896 | 6 | |
| Oberndorfer, Siegfrid | Siegfrid Oberndorfer | Actor | 1896 | 1 | |
| Osmarr, Otto | Otto Osmarr | Actor, Director | 1889 - 1919 | 23 | |
| Ouvrier, M. | M. Ouvrier | Actor | 1896 | 1 | |
| Otto, Heinrich | Heinrich Otto | Actor | 1896 | 1 | |
| Osten, Susanne | Susanne Osten | Actor | 1919 | 1 | |
| og Bauer, Breitner | Breitner og Bauer | Designer | 1897 | 1 | |
| Opel, Mr. | Mr. Opel | Actor | 1898 | 1 | |
| Ockert, Mr. | Mr. Ockert | Actor | 1898 - 1900 | 2 | |
| Olsen, Bengt | Bengt Olsen | Actor | 1898 | 1 | |
| Otto, Alex | Alex Otto | Actor, Director, Playwright | 1898 - 1934 | 21 | |
| Ohde, Mr. | Mr. Ohde | Actor | 1898 | 1 | |
| Owerłło, Paweł | Paweł Owerłło | Actor | 1899 - 1905 | 2 | |
| Ockert, Otto | Otto Ockert | Actor | 1899 | 1 | |
| Oscar, Harry | Harry Oscar | Director | 1900 | 1 | |
| Opel, Rudolf | Rudolf Opel | Actor | 1901 - 1910 | 3 | |
| Ormond, Margarethe | Margarethe Ormond | Actor | 1900 - 1901 | 2 | |
| Olden, Hertha | Hertha Olden | Actor | 1902 | 2 | |
| Ostheim, Minna | Minna Ostheim | Actor | 1900 - 1908 | 4 | |
| Oehlschläger, Anna | Anna Oehlschläger | Actor | 1904 - 1908 | 2 | |
| Oberländer, Hans | Hans Oberländer | Director | 1904 - 1908 | 2 | |
| Onno, Ferdinand | Ferdinand Onno | Actor | 1904 - 1938 | 9 | |
| Osterloh, Hildegard | Hildegard Osterloh | Actor | 1910 - 1916 | 15 | |
| Olsen, Ottilie | Ottilie Olsen | Actor | 1906 | 1 | |
| Otto, Marg. | Marg. Otto | Actor | 1906 - 1908 | 3 | |
| Ottmay, Georg | Georg Ottmay | Actor | 1906 - 1961 | 8 | |
| Oehlmann, Hans | Hans Oehlmann | Actor | 1909 | 1 | |
| Olden, Arno W. | Arno W. Olden | Actor | 1910 | 1 | |
| O’Brien, Fergus | Fergus O’Brien | Sound Designer | 2006 | 9 | |
| Oswald, Richard | Richard Oswald | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Osmarr, Lili | Lili Osmarr | Actor | 1911 - 1926 | 7 | |
| Orska, Daisy | Daisy Orska | Actor | 1911 | 1 | |
| Ott, Gisa | Gisa Ott | Actor | 1910 - 1941 | 9 | |
| Otto, Martina | Martina Otto | Actor | 1915 - 1925 | 7 | |
| Orth, Hubert | Hubert Orth | Actor | 1916 - 1917 | 2 | |
| Ostwald, Frank | Frank Ostwald | Actor | 1917 - 1937 | 5 | |
| Ott, Rita | Rita Ott | Actor | 1917 | 1 | |
| Oesterheld, Heinrich | Heinrich Oesterheld | Actor | 1918 | 2 | |
| Orth, Frk. | Frk. Orth | Actor | 1918 | 2 | |
| Opitz, Felicitas | Felicitas Opitz | Actor | 1918 - 1919 | 2 | |
| Oettinger, Liesel | Liesel Oettinger | Actor | 1919 | 1 | |
| Oehler, Hans | Hans Oehler | Actor | 1919 | 1 | |
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