| Ouyoung, Juliet | Juliet Ouyoung | Costume Designer | 1993 | 1 | |
| ova, Kry | Kry ova | | | | |
| ov!, Luk! | Luk! ov! | | | | |
| Overbey, Kellie | Kellie Overbey | Actor | 1998 | 1 | |
| Owen, Hugh | Hugh Owen | Designer | 1927 | 1 | |
| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| Owen, Marianne | Marianne Owen | Actor | 1978 - 1996 | 4 | |
| Owings, Sarah | Sarah Owings | Actor | 1976 | 1 | |
| O'Brien, Eileen | Eileen O'Brien | Actor | 2000 | 8 | |
| Ovtsjinnikova, Olga | Olga Ovtsjinnikova | | | | |
| Ostermeier, Thomas | Thomas Ostermeier | Adaptation, Director, Translator | 2002 - 2022 | 231 | |
| O'Neil, Raymond | Raymond O'Neil | Actor | 2000 | 1 | |
| Oftebro, Nils Ole | Nils Ole Oftebro | Actor | 1970 - 2018 | 92 | |
| Ording, Jørn | Jørn Ording | Actor, Director | 1938 - 1978 | 69 | |
| O'Malley, Flynn | Flynn O'Malley | Actor | 1963 | 1 | |
| O'Connor, Terrence | Terrence O'Connor | Actor | 1963 | 1 | |
| Obrtelová, Nora | Nora Obrtelová | Dramaturg | 2005 | 1 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz | Director | 1972 | 1 | |
| Otto, Teo | Teo Otto | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |
| Olsen, Kathe B. | Kathe B. Olsen | Actor | 2002 | 1 | |
| Oittinen, Tytti | Tytti Oittinen | Director | 1992 - 1994 | 2 | |
| Ornäs, Gustaf Hiort, af | Gustaf Hiort af Ornäs | Actor | 1956 | 1 | |
| Ousdal, Sverre Anker | Sverre Anker Ousdal | Actor | 1983 - 2020 | 40 | |
| Osterberger, - | - Osterberger | Actor | 1971 | 2 | |
| Ovčinnikova, O. | O. Ovčinnikova | Actor | 1999 - 2000 | 2 | |
| Olenina, E. | E. Olenina | Dancer | 1999 - 2000 | 2 | |
| O'Brien, Dan | Dan O'Brien | Designer, Lighting Designer | 2008 | 2 | |
| Oriane, Francoise | Francoise Oriane | Actor | 1984 | 1 | |
| O'Connell, Deirdre | Deirdre O'Connell | Actor, Director | 1971 - 1985 | 6 | |
| O'Connor, Kaleigh | Kaleigh O'Connor | Actor | 2002 | 1 | |
| O'Connor, Savannah | Savannah O'Connor | Actor | 2002 | 1 | |
| O'Kelly, Geri | Geri O'Kelly | Choreographer | 1993 | 1 | |
| Oppi, Frk. | Frk. Oppi | Actor | 1941 | 1 | |
| O'Neil, Sally | Sally O'Neil | Actor | 1939 | 1 | |
| O'Connor, John | John O'Connor | Director | 2003 | 1 | |
| O'Clery, Joan | Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | |
| O'Brien, Peter | Peter O'Brien | Actor | 2002 | 1 | |
| O'Connell Bak, Dennis | Dennis O'Connell Bak | Actor | 2006 | 1 | |
| Ongjerth, Richárd | Richárd Ongjerth | Actor | 1960 | 1 | |
| Oanh, Tú | Tú Oanh | Actor | 2006 - 2010 | 2 | |
| O'Foghludha, Michael | Michael O'Foghludha | Actor | 2001 | 1 | |
| O'Kane, Nancy | Nancy O'Kane | Actor | 1952 - 1961 | 2 | |
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