| Oikonomidou, S. | S. Oikonomidou | Actor | 1964 | 1 | |
| Orr, Madeleine | Madeleine Orr | Actor | 1970 | 3 | |
| Ortega, Carmen | Carmen Ortega | Actor | 1970 | 1 | |
| Otto, Sabine | Sabine Otto | Actor | 1975 | 2 | |
| Opolski, Nicholas | Nicholas Opolski | Actor | 1983 | 1 | |
| Olgyai, Magda | Magda Olgyai | Actor | 1983 | 1 | |
| Orsman, Neil | Neil Orsman | Actor | 1991 | 1 | |
| Oman, Bernarda | Bernarda Oman | Actor | 1992 - 2014 | 4 | |
| Oman, Tine | Tine Oman | Actor | 1992 | 1 | |
| Oľha, Matúš | Matúš Oľha | Director | 1993 | 1 | |
| Orsmaa, Taisto-Bertil | Taisto-Bertil Orsmaa | Adaptation, Director | 1983 - 1996 | 3 | |
| Ovanesjan, Emilija | Emilija Ovanesjan | Actor | 1993 | 1 | |
| Osca, Isabel | Isabel Osca | Actor | 2001 | 5 | |
| Oliver, Heather | Heather Oliver | Producer | 2005 | 2 | |
| Owusu, Janet | Janet Owusu | Director | 2006 | 1 | |
| 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 | |
| Oppenhagen, Sonja | Sonja Oppenhagen | Actor | 1982 - 1993 | 4 | |
| 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 | |
| Oviedo, Alejandra | Alejandra Oviedo | Actor | 2012 - 2013 | 3 | |
| 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 | |
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