| O'Brien, Jack | Jack O'Brien | Director | 1990 | 1 | |
| Oswald, David | David Oswald | Director | 1993 | 1 | |
| Orlac, S. | S. Orlac | Director | 1995 | 1 | |
| Ongley, Warwick | Warwick Ongley | Director | 1969 | 1 | |
| Oelschlegel, Vera | Vera Oelschlegel | Director | 1997 - 2000 | 52 | |
| Ocel, Tim | Tim Ocel | Director | 2002 | 1 | |
| O'Connell, Robert, A. | Robert A. O'Connell | Director | 2003 | 1 | |
| Onat, Cigdem | Cigdem Onat | Director | 2005 | 1 | |
| Otteni, Stefan | Stefan Otteni | Director | 2006 | 1 | |
| O´Valle, Violet | Violet O´Valle | Director | 2008 | 1 | |
| Otte, Charles | Charles Otte | Director | 2008 | 1 | |
| O'Reilly, Ciarán | Ciarán O'Reilly | Director | 2008 | 1 | |
| Ott, Katja | Katja Ott | Director | 2010 | 1 | |
| O’Neill, Michael | Michael O’Neill | Director | 2010 | 1 | |
| Opilik, Klaus | Klaus Opilik | Director | 2011 | 1 | |
| Ovanez Doroşenco, Anca | Anca Ovanez Doroşenco | Director | 1968 | 1 | |
| Oliver, David | David Oliver | Director | 2012 | 1 | |
| Orthous, Pedro | Pedro Orthous | Director | 1962 | 1 | |
| Osbourne, Jessica | Jessica Osbourne | Director | 2013 | 1 | |
| Ohki, Yasushi | Yasushi Ohki | Director | 1955 - 1956 | 2 | |
| Okakura, Shiro | Shiro Okakura | Director | 1953 | 1 | |
| O'Dwyer, Larry | Larry O'Dwyer | Director | 1970 | 1 | |
| Ondruch, Pavel | Pavel Ondruch | Director | 2016 | 1 | |
| O'Connell, Richard | Richard O'Connell | Director | 1947 | 2 | |
| O'Sullivan, Eugenie | Eugenie O'Sullivan | Director | 1949 | 1 | |
| Oakley, Ann | Ann Oakley | Director | 2000 | 1 | |
| O'Riordan, Rachel | Rachel O'Riordan | Director | 2015 | 1 | |
| Ostrovski, Grischa | Grischa Ostrovski | Director | 1980 | 1 | |
| O'Hearn, Susan, P. | Susan P. O'Hearn | Director | 2018 | 1 | |
| Oates, Charlie | Charlie Oates | Director | 2018 | 1 | |
| O'Brady, Mary | Mary O'Brady | Director | 2018 | 1 | |
| Ongyerth, Gust | Gust Ongyerth | Director | 1940 | 1 | |
| Onodera, Shuji | Shuji Onodera | Director | 2013 | 1 | |
| Occhiogrosso, Anne | Anne Occhiogrosso | Director | 2019 | 1 | |
| O’Riordan, Rachel | Rachel O’Riordan | Director | 2019 - 2020 | 2 | |
| Omar, Gumrah | Gumrah Omar | Director | 2019 | 1 | |
| Oliver, Federico | Federico Oliver | Director | 1902 - 1908 | 5 | |
| Oppenheim, Antoine | Antoine Oppenheim | Director | 2017 | 1 | |
| Ostojic, Biljana | Biljana Ostojic | Director | 1975 | 1 | |
| Obzina, Martin | Martin Obzina | Director | 1959 | 1 | |
| O´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
|
|
