| Olson, Niclas | Niclas Olson | Actor, Adaptation, Director | 2017 | 3 | |
| Olivero, Franco | Franco Olivero | Actor | 1986 - 1987 | 3 | |
| Orléans, Sabine | Sabine Orléans | Actor | 1994 | 3 | |
| Ovanessian, Arby | Arby Ovanessian | Costume Designer, Designer, Director | 1970 | 3 | 1 |
| O'Riordan, Rachel | Rachel O'Riordan | Director | 2015 - 2020 | 3 | |
| Omar, Hersh | Hersh Omar | Musician | 2013 - 2014 | 3 | |
| Orlando, Carlo | Carlo Orlando | Assistant Director | 2021 | 3 | |
| Olding, Francesca | Francesca Olding | Actor | 1980 | 3 | |
| Olding, Federico | Federico Olding | Actor | 1980 | 3 | |
| Obinu, Gianfranco Onatziro | Gianfranco Onatziro Obinu | Actor | 2015 - 2019 | 3 | |
| Ohland, Hans | Hans Ohland | Costume Designer, Designer | 1963 - 1981 | 4 | |
| Olsson, Lennart | Lennart Olsson | Director | 1971 - 1987 | 4 | 1 |
| Orchis, Isella | Isella Orchis | Actor | 1993 - 2013 | 4 | |
| Orlik, Stanisław | Stanisław Orlik | Actor | 1904 - 1924 | 4 | |
| Outin, Régis | Régis Outin | Actor | 1928 - 1978 | 4 | 1 |
| Owen, Marianne | Marianne Owen | Actor | 1978 - 1996 | 4 | |
| Oest, Johann Adam | Johann Adam Oest | Actor | 1977 - 2004 | 4 | 1 |
| Ottenheimer, Albert M. | Albert M. Ottenheimer | Actor | 1932 - 1936 | 4 | |
| Opsvig, Virginia | Virginia Opsvig | Costume Designer, Mask Maker | 1931 - 1936 | 4 | |
| Oster, Teresina | Teresina Oster | Actor | 1906 - 1909 | 4 | |
| Olivetti, Alessia | Alessia Olivetti | Actor | 2008 - 2011 | 4 | |
| Otrembowa, Julia | Julia Otrembowa | Actor, Translator | 1883 - 1899 | 4 | |
| Olin, Vilhelm | Vilhelm Olin | Actor, Director | 1886 - 1919 | 4 | 1 |
| 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 |
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