| Oppenhagen, Sonja | Sonja Oppenhagen | Actor | 1982 - 1993 | 4 | 1 |
| Otrélius, Dag | Dag Otrélius | Actor | 1976 | 4 | |
| Op gen Orth, Helga | Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |
| Ogier, Bulle | Bulle Ogier | Actor | 1993 | 4 | 1 |
| Oikonomidou, Miranta | Miranta Oikonomidou | Actor | 1965 - 1994 | 4 | |
| Ohkubo, Ryoichi | Ryoichi Ohkubo | Actor, Director, Translator | 1996 - 2006 | 4 | |
| Ott, Simone | Simone Ott | Actor | 1995 | 4 | |
| Olsson, Yean | Yean Olsson | Actor, Costume Designer | 1997 | 4 | |
| Ottosen, Edith | Edith Ottosen | Actor | 1955 - 1967 | 4 | |
| Ortola, Kirsti | Kirsti Ortola | Actor | 1955 - 1971 | 4 | |
| Olwagen, Christiaan | Christiaan Olwagen | Adaptation, Director | 2015 - 2016 | 4 | |
| Orlemann, Jed | Jed Orlemann | Actor | 2002 | 4 | |
| Oberthür, Martina | Martina Oberthür | Actor | 1989 | 4 | |
| Ové, Indra | Indra Ové | Actor | 2003 | 4 | |
| Owens, John | John Owens | Sound Designer | 2003 | 4 | |
| Oyama, Yumiko | Yumiko Oyama | Actor | 1998 - 2001 | 4 | |
| O’Connell, Sara | Sara O’Connell | Actor, Choreographer, Dancer | 2004 | 4 | |
| Osiński, Szymon | Szymon Osiński | Actor | 2007 | 4 | |
| Oarcea, Sibylla | Sibylla Oarcea | Actor | 1972 | 4 | |
| Olaru, Orodel | Orodel Olaru | Actor | 2009 | 4 | |
| O'Malley, Geraldine | Geraldine O'Malley | Costume Designer, Designer | 1989 - 1990 | 4 | |
| Oliveira, Christian Manuel | Christian Manuel Oliveira | Actor | 2006 - 2007 | 4 | |
| Otto, Frank-Tilmann | Frank-Tilmann Otto | Costume Designer, Designer | 2008 | 4 | |
| Otto, Max Julian | Max Julian Otto | Designer | 2008 - 2009 | 4 | |
| O’Hearn, Nigel | Nigel O’Hearn | Adaptation | 2011 - 2016 | 4 | |
| Osa, Sigbjørn, Bernhoft | Sigbjørn Bernhoft Osa | Actor | 1962 - 1965 | 4 | |
| Onsum, Per | Per Onsum | Actor | 1962 - 1965 | 4 | |
| Oberlin, Richard | Richard Oberlin | Actor | 1961 - 1963 | 4 | |
| O'Rourke, Joan | Joan O'Rourke | Actor, Costume Designer | 1945 - 1961 | 4 | |
| Ophaug, Erna | Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |
| Omdal, Leif | Leif Omdal | Actor | 1935 - 1956 | 4 | |
| Okito, Takashi | Takashi Okito | Actor | 2016 - 2018 | 4 | |
| O'Malley, Tom | Tom O'Malley | Actor | 1949 | 4 | |
| Ohlin, Bjarne | Bjarne Ohlin | Actor | 1971 | 4 | |
| Okazaki, Satsuki | Satsuki Okazaki | Actor | 2017 | 4 | |
| Oliveira, João, Ricardo Barros | João Ricardo Barros Oliveira | Musical Director, Sound Designer | 2002 - 2021 | 4 | |
| Osazuwa, Evelyn, Rasmussen | Evelyn Rasmussen Osazuwa | Actor, Composer | 2018 - 2019 | 4 | |
| Otten, Geeske | Geeske Otten | Dramaturg | 2006 | 3 | |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Olenicki, Manfred | Manfred Olenicki | Actor | 1995 - 1998 | 3 | |
| Ostermayer, Christine | Christine Ostermayer | Actor | 1965 - 1969 | 3 | |
| Ott, Sharon | Sharon Ott | Director | 1993 - 1997 | 3 | 1 |
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