| Olinescu, Boris | Boris Olinescu | Actor, Assistant Director | 1959 | 2 | |
| Ovaska, Sulo | Sulo Ovaska | Actor, Designer | 1956 | 2 | |
| Ohki, Yasushi | Yasushi Ohki | Director | 1955 - 1956 | 2 | |
| Olin, Kerstin | Kerstin Olin | Actor | 1953 | 2 | |
| Oy, Necmi | Necmi Oy | Actor | 1956 | 2 | |
| Opsahl, Svein, Eirik | Svein Eirik Opsahl | Actor | 1956 | 2 | |
| Odegard, Mary Sue | Mary Sue Odegard | Actor | 1963 | 2 | |
| Orgulas, Jaanus | Jaanus Orgulas | Actor | 1962 - 1989 | 2 | |
| Ollila, Yrjö | Yrjö Ollila | Costume Designer, Designer | 1930 | 2 | |
| Oppenheimer, Albert, M. | Albert M. Oppenheimer | Actor | 1931 | 2 | |
| 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 | |
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