| Oberländer, Hans | Hans Oberländer (Hans Oberländer) | Director | 1904 - 1908 | 2 | |
| Orth, Hubert | Hubert Orth (Hubert Orth) | Actor | 1916 - 1917 | 2 | |
| 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 | |
| Otto-Morgenstern, Martina | Martina Otto-Morgenstern (Martina Otto-Morgenstern) | Actor | 1920 - 1921 | 2 | |
| Ott, Magdalena | Magdalena Ott (Magdalena Ott) | Actor | 1919 | 2 | |
| Otto-Osmarr, Lili | Lili Otto-Osmarr (Lili Otto-Osmarr) | Actor | 1920 | 2 | |
| Oldham, Michael | Michael Oldham (Michael Oldham) | Actor | 1942 - 1948 | 2 | |
| Orska, Alina(?) | Alina(?) Orska (Alina(?) Orska) | Actor | 1901 - 1903 | 2 | |
| Ostrowska, Franciszka | Franciszka Ostrowska (Franciszka Ostrowska) | Actor | 1910 | 2 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk (Dag Eirik Orbakk) | Actor | 1985 | 2 | |
| Opdan, Kristin Aafløy | Kristin Aafløy Opdan (Kristin Aafløy Opdan) | Actor | 1996 - 2013 | 2 | |
| Omland, Tone | Tone Omland (Tone Omland) | Actor | 1996 - 2013 | 2 | |
| Onsaker, Maren K. | Maren K. Onsaker (Maren K. Onsaker) | Actor | 1998 | 2 | |
| Opdal, Karina | Karina Opdal (Karina Opdal) | Actor | 2000 | 2 | |
| Odden, Elise Brunstad | Elise Brunstad Odden (Elise Brunstad Odden) | Actor | 2002 | 2 | |
| Offord, Sverre | Sverre Offord (Sverre Offord) | Actor | 2002 | 2 | |
| Opsahl, Linda | Linda Opsahl (Linda Opsahl) | Actor | 2002 | 2 | |
| Oldani, Emilia | Emilia Oldani (Emilia Oldani) | Actor | 2006 | 2 | |
| Olsen, Kim | Kim Olsen (Kim Olsen) | Actor | 2011 - 2019 | 2 | |
| Oborotov, Yuri | Yuri Oborotov (Yuri Oborotov) | Actor | 2012 | 2 | |
| Olstad, Andrea | Andrea Olstad (Andrea Olstad) | Actor | 2012 | 2 | |
| Oftedal, Stian | Stian Oftedal (Stian Oftedal) | Actor | 2012 | 2 | |
| Ozols, Jānis | Jānis Ozols (Jānis Ozols) | Actor | 1915 | 2 | |
| Olin, Wilhelm | Wilhelm Olin (Wilhelm Olin) | Actor, Director | 1891 - 1919 | 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 | |
| Ohnesorge, Helli | Helli Ohnesorge | Actor | 1978 - 1986 | 2 | |
| Ohlschewski, Gerhard | Gerhard Ohlschewski | Actor | 1975 | 2 | |
| Ostrowski, Janusz | Janusz Ostrowski | Actor | 1975 | 2 | |
| Owens, Elizabeth | Elizabeth Owens | Actor | 1971 - 1979 | 2 | |
| Otto, Carsten | Carsten Otto | Actor | 1975 - 1976 | 2 | |
| Oberhof, Johannes | Johannes Oberhof | Actor | 1972 | 2 | |
| Ozolins, Miervaldis | Miervaldis Ozolins | Actor | 1964 - 1975 | 2 | |
| Otsus, Velda | Velda Otsus | Actor | 1962 - 1976 | 2 | |
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