| 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'Brien, Dan | Dan O'Brien (Dan O'Brien) | Designer, Lighting Designer | 2008 | 2 | |
| O'Neill, Chris | Chris O'Neill (Chris O'Neill) | Designer, Lighting Designer | 2011 | 2 | |
| Olmsted, Richard | Richard Olmsted | Designer, Lighting Designer | 2002 - 2003 | 3 | |
| Oggenfuss, Michael | Michael Oggenfuss | Designer, Lighting Designer | 2002 - 2004 | 66 | |
| O'Connor, Boardman | Boardman O'Connor | Designer, Lighting Designer | 1961 | 2 | |
| Orr, Lynn E. | Lynn E. Orr (Lynn E. Orr) | Designer, Director, Lighting Designer | 1937 | 3 | |
| Omodei, Raymond | Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |
| Olroth-Hackenbroch, Gisela | Gisela Olroth-Hackenbroch | Designer, Director | 2011 | 2 | |
| Ockel, Reinhold | Reinhold Ockel | Designer, Director | 1927 - 1942 | 2 | |
| Okun, Alexander | Alexander Okun (Alexander Okun) | Designer | 1992 - 2003 | 3 | |
| Otto, Wilfried | Wilfried Otto (Wilfried Otto) | Designer | 1958 | 1 | |
| Owen, Hugh | Hugh Owen (Hugh Owen) | Designer | 1927 | 1 | |
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