| 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 | 1 |
| O'Reilly, Ciarán | Ciarán O'Reilly | Director | 2008 | 1 | 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 | 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 | |
| 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 | 2015 - 2020 | 3 | |
| 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 | |
| Okin, Matt | Matt Okin | Director | 2023 | 1 | |
| O'Leary, Pascal | Pascal O'Leary | Director | 2024 | 1 | |
| Orlandini, Gianluca | Gianluca Orlandini | Director | 2003 | 1 | |
| Oldani, Claudio | Claudio Oldani | Director | 1991 | 1 | |
| Olvera, Omar | Omar Olvera | Director | 2024 | 1 | |
| O'Brien, Dan | Dan O'Brien | Designer, Lighting Designer | 2008 | 2 | |
| O'Neill, Chris | Chris O'Neill | Designer, Lighting Designer | 2011 | 2 | |
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