| 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´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| Orme, Michael | Michael Orme | Director, Producer | 1930 - 1936 | 5 | |
| Oppenheim, Yoni | Yoni Oppenheim | Director, Producer | 2011 | 2 | 1 |
| Ohoka, Kinji | Kinji Ohoka | Director, Translator | 1971 | 2 | |
| Otten, Geeske | Geeske Otten | Dramaturg | 2006 | 3 | |
| Ohnemus, Chris | Chris Ohnemus | Dramaturg | 1999 - 2000 | 2 | |
| Obrtelová, Nora | Nora Obrtelová | Dramaturg | 2005 | 1 | |
| Odendahl-James, Jules | Jules Odendahl-James | Dramaturg | 2011 | 1 | |
| Oberschlick, Gerhard | Gerhard Oberschlick | Dramaturg | 1975 | 1 | |
| Ostermann, Brigitte | Brigitte Ostermann | Dramaturg | 2004 - 2008 | 4 | |
| Otto, Gabriele | Gabriele Otto | Dramaturg | 1992 | 1 | |
| Oberender, Thomas | Thomas Oberender | Dramaturg | 2003 - 2004 | 6 | 1 |
| Otčenášek, Štěpán | Štěpán Otčenášek | Dramaturg | 2013 | 3 | |
| Ott, Karen | Karen Ott | Dramaturg | 2003 | 1 | |
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