| Ostheim, Minna | Minna Ostheim | Actor | 1900 - 1908 | 4 | |
| Olsen, Hanns | Hanns Olsen | Actor | 1921 - 1931 | 4 | |
| Ormonde, Eugene | Eugene Ormonde | Actor | 1900 - 1904 | 4 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1903 - 1909 | 4 | |
| Ottolini, Piero | Piero Ottolini | Translator | 1905 - 1906 | 4 | 1 |
| Olasz, Pál | Pál Olasz | Actor | 1906 - 1908 | 4 | |
| Omar, Sulekha Ali | Sulekha Ali Omar | Choreographer, Dancer | 2008 - 2010 | 4 | |
| Olerud, Ingeborg S. | Ingeborg S. Olerud | Lighting Designer | 2008 - 2010 | 4 | |
| Olsen, Thale Kvam | Thale Kvam Olsen | Costume Designer, Designer | 2013 | 4 | |
| Orford, Cathleen | Cathleen Orford | Actor | 1913 - 1918 | 4 | |
| Ottesen, Oscar | Oscar Ottesen | Lighting Designer | 1954 - 1971 | 4 | |
| Ostałowska, Dominika | Dominika Ostałowska | Actor | 2005 - 2006 | 4 | |
| Onaityte, Jurate | Jurate Onaityte | Actor | 1998 - 2000 | 4 | |
| Ogilvie, Michael | Michael Ogilvie | Actor | 1978 - 1982 | 4 | |
| Ognjanović, Aleksandar | Aleksandar Ognjanović | Director | 1955 - 1979 | 4 | |
| Ogasawara, Yoshitomo | Yoshitomo Ogasawara | Actor | 1976 - 1990 | 4 | |
| Okking, Jens | Jens Okking | Actor | 1979 - 1984 | 4 | 1 |
| O`Brien-Moore, Erin | Erin O'Brien-Moore | Actor | 1923 - 1956 | 4 | |
| O'Donnell, Patricia | Patricia O'Donnell | Actor | 1981 | 4 | 1 |
| Oman, Bernarda | Bernarda Oman | Actor | 1992 - 2014 | 4 | |
| O'Connor, Joanna | Joanna O'Connor | Actor | 2007 - 2021 | 4 | 1 |
| Ostermann, Brigitte | Brigitte Ostermann | Dramaturg | 2004 - 2008 | 4 | |
| Oscarsson, Per | Per Oscarsson | Actor | 1950 - 1997 | 4 | |
| 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 | |
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