| Onorato, Mr. | Mr. Onorato | Actor | 1893 | 2 | |
| Olander, Albert | Albert Olander | Actor | 1893 | 2 | |
| Oliver, Olive | Olive Oliver | Actor | 1894 - 1904 | 2 | 1 |
| Orling, O. | O. Orling | Designer | 1895 | 2 | |
| Ockert, Mr. | Mr. Ockert | Actor | 1898 - 1900 | 2 | |
| Owerłło, Paweł | Paweł Owerłło | Actor | 1899 - 1905 | 2 | |
| Ormond, Margarethe | Margarethe Ormond | Actor | 1900 - 1901 | 2 | |
| Olden, Hertha | Hertha Olden | Actor | 1902 | 2 | |
| Oehlschläger, Anna | Anna Oehlschläger | Actor | 1904 - 1908 | 2 | |
| Oberländer, Hans | Hans Oberländer | Director | 1904 - 1908 | 2 | |
| Orth, Hubert | Hubert Orth | Actor | 1916 - 1917 | 2 | |
| Oesterheld, Heinrich | Heinrich Oesterheld | Actor | 1918 | 2 | |
| Orth, Frk. | Frk. Orth | Actor | 1918 | 2 | |
| Opitz, Felicitas | Felicitas Opitz | Actor | 1918 - 1919 | 2 | |
| 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 | |
| Oldham, Michael | Michael Oldham | Actor | 1942 - 1948 | 2 | |
| Orska, Alina(?) | Alina(?) Orska | Actor | 1901 - 1903 | 2 | |
| Ostrowska, Franciszka | Franciszka Ostrowska | Actor | 1910 | 2 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk | Actor | 1985 | 2 | |
| Opdan, Kristin Aafløy | Kristin Aafløy Opdan | Actor | 1996 - 2013 | 2 | |
| Omland, Tone | Tone Omland | Actor | 1996 - 2013 | 2 | |
| Onsaker, Maren K. | Maren K. Onsaker | Actor | 1998 | 2 | |
| Opdal, Karina | Karina Opdal | Actor | 2000 | 2 | |
| Odden, Elise Brunstad | Elise Brunstad Odden | Actor | 2002 | 2 | |
| Offord, Sverre | Sverre Offord | Actor | 2002 | 2 | |
| Opsahl, Linda | Linda Opsahl | Actor | 2002 | 2 | 1 |
| Oldani, Emilia | Emilia Oldani | Actor | 2006 | 2 | |
| Olsen, Kim | Kim Olsen | Actor | 2011 - 2019 | 2 | |
| Oborotov, Yuri | Yuri Oborotov | Actor | 2012 | 2 | |
| Olstad, Andrea | Andrea Olstad | Actor | 2012 | 2 | |
| Oftedal, Stian | Stian Oftedal | Actor | 2012 | 2 | |
| Ozols, Jānis | Jānis Ozols | Actor | 1915 | 2 | |
| Owen, Reginald | Reginald Owen | Actor | 1926 - 1932 | 2 | |
| Ouedraogo, Gérard | Gérard Ouedraogo | Actor | 2002 | 2 | |
| Ouedraogo, Issa | Issa Ouedraogo | Actor | 2002 | 2 | |
| Ouedraogo, Léontine | Léontine Ouedraogo | Actor | 2002 | 2 | |
| Olszewski, Zbigniew | Zbigniew Olszewski | Actor | 1992 | 2 | |
| O'Lochlainn, Gearoid | Gearoid O'Lochlainn | Actor, Translator | 1928 - 2009 | 2 | |
| Ohkata, Hisako | Hisako Ohkata | Actor | 1978 - 1983 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
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