| Ostrižnaja, O. | O. Ostrižnaja | Lighting Designer | 1999 - 2000 | 2 | |
| Oikonomidis, Kostas | Kostas Oikonomidis | Actor | 1934 | 2 | |
| O'Flyn, Audrey | Audrey O'Flyn | Actor | 1936 | 2 | |
| Oldenhof, Bouke | Bouke Oldenhof | Adaptation, Translator | 1999 | 2 | |
| Opgaard, John | John Opgaard | Actor, Designer | 1939 | 2 | |
| Orth, Philip | Philip Orth | Actor | 1940 | 2 | |
| O'Connell, Alice | Alice O'Connell | Actor | 1940 | 2 | |
| Orfanos, Lampros | Lampros Orfanos | Costume Designer, Designer | 1943 | 2 | |
| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| O'Connell, Richard | Richard O'Connell | Director | 1947 | 2 | |
| Ohoka, Kinji | Kinji Ohoka | Director, Translator | 1971 | 2 | |
| Orbán, Levente | Levente Orbán | Actor | 2016 | 2 | |
| Ognyanova, Rositsa | Rositsa Ognyanova | Actor | 2015 - 2016 | 2 | |
| Orhon, Coşkun | Coşkun Orhon | Actor | 1965 - 1971 | 2 | |
| 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 | |
| Onnis, Valeria | Valeria Onnis | Costume Designer | 2012 | 2 | |
| Otieno, Mercy Dorcas | Mercy Dorcas Otieno | Actor | 2021 | 2 | |
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