| Owe, David | David Owe | Actor | 2004 | 1 | 1 |
| Obritzhauser, Andrea | Andrea Obritzhauser | Actor | 2004 | 1 | 1 |
| O'Callaghan, Tony | Tony O'Callaghan | Actor | 2004 | 1 | 1 |
| O'Brien, Jim | Jim O'Brien | Actor | 2004 - 2021 | 2 | 1 |
| Owe, Bård | Bård Owe | Actor | 2004 - 2005 | 3 | 1 |
| Olsson, Hugo | Hugo Olsson | Actor | 2004 | 1 | 1 |
| Olárová, Renata | Renata Olárová | Actor | 1958 | 1 | 1 |
| Ojanen, Laura | Laura Ojanen | Actor | 2005 | 1 | 1 |
| Ondříček, Antonín | Antonín Ondříček | Actor | 1948 | 1 | 1 |
| Ondrejková, Bibiana | Bibiana Ondrejková | Actor | 1999 | 1 | 1 |
| Oliver, Barbara | Barbara Oliver | Actor, Director | 2006 - 2010 | 3 | 1 |
| Oxlade, Jonathon | Jonathon Oxlade | Costume Designer, Designer | 2007 | 2 | 1 |
| Oja, Tõnu | Tõnu Oja | Actor | 2007 - 2022 | 2 | 1 |
| O'Connell, Caitlin | Caitlin O'Connell | Actor | 2006 - 2009 | 2 | 1 |
| O'Connor, Jim | Jim O'Connor | Actor | 2006 | 1 | 1 |
| Ouellette, Jean-Sébastien | Jean-Sébastien Ouellette | Actor | 2009 - 2022 | 3 | 1 |
| Otte, Charles | Charles Otte | Director | 2008 | 1 | 1 |
| Otterson, William | William Otterson | Actor | 2009 | 1 | 1 |
| O'Reilly, Ciarán | Ciarán O'Reilly | Director | 2008 | 1 | 1 |
| Ofsdal, Steinar | Steinar Ofsdal | Musician | 1978 | 38 | 1 |
| O'Neill, Noreen | Noreen O'Neill | Actor | 2011 | 1 | 1 |
| Ongota, Beverley | Beverley Ongota | Actor | 2011 | 1 | 1 |
| O'Reilly, Vincent, A. | Vincent A. O'Reilly | Adaptation, Director | 2012 | 2 | 1 |
| Oliver, David | David Oliver | Director | 2012 | 1 | 1 |
| Olivier, Laurence | Laurence Olivier | Actor | 1944 - 1965 | 6 | 1 |
| Olsen, Arne, Thomas | Arne Thomas Olsen | Actor, Director | 1955 - 1963 | 19 | 1 |
| O'Rowe, Mark | Mark O'Rowe | Adaptation | 2016 | 1 | 1 |
| Olsen, Clifford, R. | Clifford R. Olsen | Actor, Director | 1963 | 2 | 1 |
| O'Connell, Moya | Moya O'Connell | Actor, Director | 2012 - 2024 | 2 | 1 |
| Odintsova, Polina | Polina Odintsova | Actor | 2012 | 1 | 1 |
| Otten, Marcel | Marcel Otten | Translator | 2012 - 2013 | 29 | 1 |
| Otte, Carly | Carly Otte | Actor | 2013 | 1 | 1 |
| Orlikowsky, Wazlaw | Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 | 3 | 1 |
| Orbeck, Anders | Anders Orbeck | Translator | 1936 - 2018 | 3 | 1 |
| O'Connell, Patrick | Patrick O'Connell | Actor | 1999 | 1 | 1 |
| Osman, C.M. | C.M. Osman | Actor | 1928 | 1 | 1 |
| Ostrow, Isa | Isa Ostrow | Actor | 1941 | 1 | 1 |
| Olsson, Gunnar | Gunnar Olsson | Actor | 1946 | 1 | 1 |
| O'Hara, Jill | Jill O'Hara | Actor | 1971 | 1 | 1 |
| Ortmann, Wilfried | Wilfried Ortmann | Actor | 1973 | 1 | 1 |
| Onay, Yılmaz | Yılmaz Onay (Yilmaz Onay) | Translator | 2007 | 1 | 1 |
| Ohmen, Kristina | Kristina Ohmen | Dramaturg | 2018 | 1 | 1 |
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