| Ossowski, Nicolas | Nicolas Ossowski | Actor | 2021 | 1 | |
| O'Kane, John | John O'Kane | Actor | 2021 | 1 | |
| Oláh, Vilmos | Vilmos Oláh | Actor | 1988 | 1 | |
| Op de Beeck, Theo | Theo Op de Beeck | Actor | 1961 | 1 | |
| O'Brien, Joseph | Joseph O'Brien | Actor | 1960 | 1 | |
| Osborn, Andrew | Andrew Osborn | Actor | 1951 | 1 | |
| O'Connor, Loyola | Loyola O'Connor | Actor | 1916 | 1 | |
| Ortiz, Gabe | Gabe Ortiz | Actor | 2022 | 1 | |
| Oftebro, Jonas Hoff | Jonas Hoff Oftebro | Actor | 2022 | 1 | |
| Ohlinger, Kristie | Kristie Ohlinger | Actor | 2022 | 1 | |
| O'Farrell, Noémie | Noémie O'Farrell | Actor | 2022 | 2 | |
| Omerović, Aldin | Aldin Omerović | Actor | 2022 | 1 | |
| Orozco, Carolina | Carolina Orozco | Actor | 2022 | 1 | |
| Ortenzi, Oriana | Oriana Ortenzi | Actor | 2022 | 1 | |
| Ou, Daisy | Daisy Ou | Actor | 2022 | 1 | |
| Olsen, Brian | Brian Olsen | Actor | 2022 | 2 | |
| O'Brien, Meredith | Meredith O'Brien | Actor | 2022 | 1 | |
| Ooi, Mike | Mike Ooi | Actor | 2022 | 1 | |
| Ošavkova, Sonja | Sonja Ošavkova (Соња Ошавкова) | Actor | 2013 | 1 | |
| Olivar, Mr | Mr Olivar | Actor | 1900 | 2 | |
| Ouisem, Abdellaoui | Abdellaoui Ouisem | Actor | 2022 | 1 | |
| Oteyza, Ramón | Ramón Oteyza | Actor | 1975 | 1 | |
| Olier, Luz | Luz Olier | Actor | 2016 | 8 | |
| Olteanu , Stefan | Stefan Olteanu | Actor | 2022 | 1 | |
| Oliva, Mr. | Mr. Oliva | Actor | 1893 | 1 | |
| Orjas, José | José Orjas | Actor | 1968 | 1 | |
| Olsson, Erik | Erik Olsson | Actor | 2022 | 1 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Odeen-Isbister, Sara | Sara Odeen-Isbister | Actor, Adaptation | 2020 | 2 | |
| Op gen Orth, Helga | Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |
| Ohshima, Nobuhisa | Nobuhisa Ohshima | Actor, Adaptation, Director | 1994 | 3 | |
| Olson, Niclas | Niclas Olson | Actor, Adaptation, Director | 2017 | 3 | |
| Oliveira, Domingos, José Soares de | Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |
| Opstad, Peder | Peder Opstad (Peder Opstad) | Actor, Adaptation, Director, Producer | 2005 - 2010 | 183 | |
| Olinescu, Boris | Boris Olinescu | Actor, Assistant Director | 1959 | 2 | |
| O'Mahoney, Robert | Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |
| O’Connell, Sara | Sara O’Connell | Actor, Choreographer, Dancer | 2004 | 4 | |
| Olsen, Ole | Ole Olsen (Ole Olsen) | Actor, Composer | 1895 - 1922 | 18 | 1 |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| Osazuwa, Evelyn, Rasmussen | Evelyn Rasmussen Osazuwa | Actor, Composer | 2018 - 2019 | 4 | |
| Olsson, Yean | Yean Olsson | Actor, Costume Designer | 1997 | 4 | |
| O'Rourke, Joan | Joan O'Rourke | Actor, Costume Designer | 1945 - 1961 | 4 | |
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