| Oberwalder, Lisl | Lisl Oberwalder | Actor | 1958 - 1962 | 2 | |
| Otto, Sabine | Sabine Otto | Actor | 1975 | 2 | |
| Oliver, Heather | Heather Oliver | Producer | 2005 | 2 | |
| Oikonomidis, Dimitris | Dimitris Oikonomidis | Actor | 2009 | 2 | |
| Olsen, Edgar Meyer | Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |
| Olroth-Hackenbroch, Gisela | Gisela Olroth-Hackenbroch | Designer, Director | 2011 | 2 | |
| Ondráčková, Danuše | Danuše Ondráčková | Actor | 1984 | 2 | |
| Omnéus, Göran | Göran Omnéus | Actor | 1976 | 2 | |
| Oechslin, Rosmarie | Rosmarie Oechslin | Actor | 1985 | 2 | |
| O´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Oskam, Peter | Peter Oskam | Costume Designer, Designer | 1985 | 2 | |
| O'Hara, John, Ryker | John Ryker O'Hara | Actor | 1985 | 2 | |
| O'Toole, John | John O'Toole | Actor | 1987 - 2000 | 2 | |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| O´Donnell, Sarah | Sarah O´Donnell | Actor | 1987 | 2 | |
| Oliveri, Josephyne | Josephyne Oliveri | Actor | 1987 | 2 | |
| Ornbo, Robert | Robert Ornbo | Lighting Designer | 1978 - 1987 | 2 | 1 |
| Otto, Eva | Eva Otto | Actor | 1991 | 2 | |
| Obermüller, Ulrike | Ulrike Obermüller | Costume Designer | 1991 - 2016 | 2 | |
| Ohlsson, Lotta | Lotta Ohlsson | Actor | 1990 | 2 | |
| Oscarsson, Kjell | Kjell Oscarsson | Actor | 1990 | 2 | |
| Opfinger, Heinz | Heinz Opfinger | Actor | 1990 - 1991 | 2 | |
| Otto, Victoria | Victoria Otto | Actor | 1990 | 2 | |
| Ornest, Jiří | Jiří Ornest | Actor | 1988 - 2012 | 2 | |
| Obst, Dietmar | Dietmar Obst | Actor | 1993 - 1999 | 2 | |
| Ottosson, Annelie | Annelie Ottosson | Actor | 1993 | 2 | |
| Ottlik, Ádám | Ádám Ottlik | Actor | 1996 - 2008 | 2 | 1 |
| Oberle, Carl-Friedrich | Carl-Friedrich Oberle | Costume Designer, Designer | 1994 | 2 | |
| O'Sullivan, Barney | Barney O'Sullivan | Actor | 1976 - 1980 | 2 | |
| Oglesby, Thomas | Thomas Oglesby | Actor | 1977 - 1980 | 2 | 1 |
| Ohlsson, Marika | Marika Ohlsson | Actor | 1997 | 2 | |
| Ohara, Ken | Ken Ohara | Actor | 1996 - 1997 | 2 | |
| Olsson, Inge | Inge Olsson | Actor | 1997 | 2 | |
| Olsson, Nicholas | Nicholas Olsson | Actor | 1996 - 1997 | 2 | |
| Ożana, Edward | Edward Ożana | Actor | 1970 - 1975 | 2 | |
| Oubram, Stanislav | Stanislav Oubram | Actor | 1969 - 2006 | 2 | |
| O’Rowe, Mark | Mark O’Rowe | Adaptation, Director | 2015 - 2023 | 2 | |
| Ostroróg, Mieczysław | Mieczysław Ostroróg | Actor | 1968 | 2 | |
| Oettinger, Karen | Karen Oettinger | Actor | 1968 | 2 | |
| Olty, Magda | Magda Olty | Actor | 1935 - 1941 | 2 | |
| Ogata, Kikuko | Kikuko Ogata | Costume Designer | 1968 - 2010 | 2 | |
| Oszter, Sándor | Sándor Oszter | Actor | 1978 - 2007 | 2 | 1 |
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