| Oudart, Gisèle | Gisèle Oudart | Actor | 1969 | 1 | 1 |
| Oswald, Cornelius | Cornelius Oswald | Designer | 2014 | 1 | 1 |
| Oakeshott, Owen | Owen Oakeshott | Actor | 2013 - 2014 | 11 | 1 |
| Oszter, Sándor | Sándor Oszter | Actor | 1978 - 2007 | 2 | 1 |
| Olsavszky, Éva | Éva Olsavszky | Actor | 2002 | 1 | 1 |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | 1 |
| Otto, Philipp | Philipp Otto | Actor | 2002 - 2015 | 11 | 1 |
| Oggenfuss, Michael | Michael Oggenfuss | Designer, Lighting Designer | 2002 - 2004 | 66 | 1 |
| Odor, Josh | Josh Odor | Actor | 2002 | 1 | 1 |
| Oberhof, Valerie | Valerie Oberhof | Actor | 2002 - 2012 | 6 | 1 |
| Osztovits, Cecilia | Cecilia Osztovits | Adaptation | 2002 | 1 | 1 |
| Odyja-Thacker, Nancy | Nancy Odyja-Thacker | Actor | 2003 | 1 | 1 |
| Oxenvad, Ann Sofie | Ann Sofie Oxenvad | Adaptation | 2003 | 1 | 1 |
| O'Neill, Errol | Errol O'Neill | Actor | 1989 | 1 | 1 |
| Oberender, Thomas | Thomas Oberender | Dramaturg | 2003 - 2004 | 6 | 1 |
| Overton, Kelly | Kelly Overton | Actor | 2001 | 1 | 1 |
| Oppenberg, Marette | Marette Oppenberg | Costume Designer | 2003 | 2 | 1 |
| Okpokwasili, Okwui | Okwui Okpokwasili | Actor | 2003 - 2010 | 3 | 1 |
| 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 |
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