| Oman, Tine | Tine Oman | Actor | 1992 | 1 | |
| Oľha, Matúš | Matúš Oľha | Director | 1993 | 1 | |
| Ovanesjan, Emilija | Emilija Ovanesjan | Actor | 1993 | 1 | |
| Osca, Isabel | Isabel Osca | Actor | 2001 | 5 | |
| Oliver, Heather | Heather Oliver | Producer | 2005 | 2 | |
| Ogawa, Ikuo | Ikuo Ogawa | Lighting Designer | 2008 | 1 | |
| Ostermann, Brigitte | Brigitte Ostermann | Dramaturg | 2004 - 2008 | 4 | |
| Oscarsson, Per | Per Oscarsson | Actor | 1950 - 1997 | 4 | |
| Olariu, Dana | Dana Olariu | Actor | 2009 - 2015 | 3 | |
| Oikonomidis, Dimitris | Dimitris Oikonomidis | Actor | 2009 | 2 | |
| Osterberg, Craig | Craig Osterberg | Actor, Designer, Lighting Designer | 2009 | 3 | |
| O'Neil, Ted | Ted O'Neil | Actor | 2009 | 1 | |
| Orihuela, Belén | Belén Orihuela | Actor | 2009 | 1 | |
| O’Keefe, Brian | Brian O’Keefe | Costume Designer | 2009 | 1 | |
| Owen-Jones, Rusty | Rusty Owen-Jones | Actor | 1972 | 1 | |
| Owe, Baard | Baard Owe | Actor | 1964 - 2007 | 5 | |
| Odvárková, Lenka | Lenka Odvárková | Designer | 2009 - 2011 | 3 | |
| Olbrück, Robert | Robert Olbrück | Actor | 1983 | 1 | |
| Olsen, Edgar Meyer | Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |
| Ondrášek, Peter | Peter Ondrášek | Actor | 2011 | 1 | |
| Olroth-Hackenbroch, Gisela | Gisela Olroth-Hackenbroch | Designer, Director | 2011 | 2 | |
| O'Connor, Thom | Thom O'Connor | Composer | 2013 | 1 | |
| Ondráčková, Danuše | Danuše Ondráčková | Actor | 1984 | 2 | |
| Olafson, Anne | Anne Olafson | Actor | 2012 | 1 | |
| O'Neill, Aron, Arnarson | Aron Arnarson O'Neill | Actor | 2012 | 1 | |
| Oberhauser, Kendra | Kendra Oberhauser | Actor | 2012 | 1 | |
| Oshry, Joseph, P. | Joseph P. Oshry | Lighting Designer | 2012 | 1 | |
| Olson, Todd | Todd Olson | Sound Designer | 2012 | 1 | |
| O'Sullivan, Matthew | Matthew O'Sullivan | Actor | 1984 | 1 | |
| Okuněv, Alexej | Alexej Okuněv | Actor | 1984 | 1 | |
| Otrélius, Dag | Dag Otrélius | Actor | 1976 | 4 | |
| Omnéus, Göran | Göran Omnéus | Actor | 1976 | 2 | |
| Owen, Philip | Philip Owen | Sound Designer | 2013 | 1 | |
| O'Flaherty, Michael | Michael O'Flaherty | Musical Director | 1984 | 1 | |
| Olsen, Karl Gustav | Karl Gustav Olsen | Actor | 1933 | 1 | |
| Osvald, Aksel | Aksel Osvald | Actor | 1933 - 1935 | 3 | |
| Owen, Jenny | Jenny Owen | Actor | 2013 | 1 | |
| O'Hara, Caitlin | Caitlin O'Hara | Designer | 2013 | 1 | |
| Onwumere, Toby | Toby Onwumere | Actor | 2014 | 1 | |
| Olsen, Roar, Skau | Roar Skau Olsen | Sound Designer | 2013 | 1 | |
| Oppliger, Hans | Hans Oppliger | Actor | 1986 | 1 | |
| Oechslin, Rosmarie | Rosmarie Oechslin | Actor | 1985 | 2 | |
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