| Ottesen, Thorbjørn | Thorbjørn Ottesen | Musician | 1993 - 1994 | 2 | |
| Oppel, Heinrich | Heinrich Oppel | Actor | 1889 | 2 | |
| Otto, Karl | Karl Otto | Actor | 1910 - 1911 | 2 | |
| Ogden, Betty | Betty Ogden | Actor | 1969 - 1972 | 2 | |
| O'Nians, Honor | Honor O'Nians | Designer | 1945 - 1946 | 2 | |
| Onishi, Ayaka | Ayaka Onishi | Actor | 2018 | 2 | |
| Ohtaka, Akira | Akira Ohtaka | Actor | 2018 | 2 | |
| Oron, Tamar | Tamar Oron | Actor | 2020 | 2 | |
| Ocina, Gabriel | Gabriel Ocina | Actor | 2018 - 2020 | 2 | |
| Okafor, Amaka | Amaka Okafor | Actor | 2020 - 2023 | 2 | |
| Ose, Victoria | Victoria Ose | Actor | 2020 | 2 | |
| Olmedo, Christian | Christian Olmedo | Actor | 2019 - 2020 | 2 | |
| Ouzeau, Bruno | Bruno Ouzeau | Actor | 2020 - 2023 | 2 | |
| Olafsson, Emil | Emil Olafsson | Actor | 2020 - 2024 | 2 | |
| Odeen-Isbister, Sara | Sara Odeen-Isbister | Actor, Adaptation | 2020 | 2 | |
| Orly, Yvonne | Yvonne Orly | Actor | 1935 | 2 | |
| Ortscheidt, Mathilde | Mathilde Ortscheidt | Actor | 2014 - 2015 | 2 | |
| Ossowski, Nicolas | Nicolas Ossowski | Actor | 2021 - 2023 | 2 | |
| O'Farrell, Noémie | Noémie O'Farrell | Actor | 2022 | 2 | |
| O’Rourke, Rylee | Rylee O’Rourke | Assistant Director, Producer | 2020 - 2022 | 2 | |
| Ortenzi, Oriana | Oriana Ortenzi | Actor | 2022 - 2024 | 2 | |
| Olsen, Brian | Brian Olsen | Actor | 2022 | 2 | |
| Olivar, Mr | Mr Olivar | Actor | 1900 | 2 | |
| Osako, Koji | Koji Osako (大迫浩二) | Lighting Designer | 2023 | 2 | |
| Okawa, Tamaki | Tamaki Okawa (Ōkawa Tamaki / 大川珠季) | Dramaturg, Translator | 2024 | 2 | |
| Oppi, Giulio | Giulio Oppi | Actor | 1948 - 1949 | 2 | |
| Otten, Geeske | Geeske Otten | Dramaturg | 2006 | 3 | |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Olenicki, Manfred | Manfred Olenicki | Actor | 1995 - 1998 | 3 | |
| Ostermayer, Christine | Christine Ostermayer | Actor | 1965 - 1969 | 3 | |
| Ott, Sharon | Sharon Ott | Director | 1993 - 1997 | 3 | 1 |
| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| Orr, Lynn E. | Lynn E. Orr | Designer, Director, Lighting Designer | 1937 | 3 | |
| Orlandini, C. | C. Orlandini | Actor | 1891 - 1892 | 3 | |
| Otremba, Adolf | Adolf Otremba | Translator | 1882 - 1883 | 3 | |
| Olszewski, Edward | Edward Olszewski | Actor | 1894 - 1902 | 3 | |
| Opel, Rudolf | Rudolf Opel | Actor | 1901 - 1910 | 3 | |
| Otto, Marg. | Marg. Otto | Actor | 1906 - 1908 | 3 | |
| Oppermann, Leonore | Leonore Oppermann | Actor | 1919 - 1922 | 3 | |
| Osten, Käte | Käte Osten | Actor | 1919 - 1923 | 3 | |
| Ohlsen, Castora | Castora Ohlsen | Actor | 1902 - 1909 | 3 | |
| Osmond, Clara | Clara Osmond | Actor | 1906 - 1907 | 3 | |
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