| Otto, Max Julian | Max Julian Otto | Designer | 2008 - 2009 | 4 | |
| Onegin, Andrei | Andrei Onegin | Designer | 2009 | 1 | |
| Ogden, James | James Ogden | Designer | 2009 | 1 | |
| Orwig, Katie | Katie Orwig | Designer | 2011 | 1 | |
| O'Mahony, Paul | Paul O'Mahony | Designer | 2013 - 2017 | 3 | |
| Olsen, Jens-Anker | Jens-Anker Olsen | Designer | 1954 - 1956 | 2 | |
| Owen, Tony | Tony Owen | Designer | 2013 | 1 | |
| Ockermüller, Heinz | Heinz Ockermüller | Designer | 1953 | 1 | |
| Okazaki, Koji | Koji Okazaki | Designer | 1999 | 1 | |
| Opgaard, Alen | Alen Opgaard | Designer | 1939 | 1 | |
| Opgaard, Gustav | Gustav Opgaard | Designer | 1939 | 1 | |
| O'Neil, Randall | Randall O'Neil | Designer | 1948 | 1 | |
| Orfanidis, Stelios | Stelios Orfanidis | Designer | 1949 | 1 | |
| O'Nians, Honor | Honor O'Nians | Designer | 1945 - 1946 | 2 | |
| Orlowicz, Tadeusz | Tadeusz Orlowicz | Designer | 1964 | 1 | |
| Obrezkov, Maksim | Maksim Obrezkov | Designer | 2019 | 1 | |
| Occhelli, P. | P. Occhelli | Designer | 1931 | 1 | |
| O'Connor, Hugh | Hugh O'Connor | Designer | 2014 | 1 | |
| Osipova, Nadežda | Nadežda Osipova | Designer | 2016 | 1 | |
| O'Brien, Denise | Denise O'Brien | Designer | 2023 | 1 | |
| 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 | |
| Orr, Lynn E. | Lynn E. Orr | Designer, Director, Lighting Designer | 1937 | 3 | |
| O'Brien, Dan | Dan O'Brien | Designer, Lighting Designer | 2008 | 2 | |
| O'Neill, Chris | 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 | |
| Ohgitani, Kunio | Kunio Ohgitani | Director | 1980 | 1 | |
| Osmanov, Bahram | Bahram Osmanov | Director | 2006 | 1 | |
| Olsson, Lennart | Lennart Olsson | Director | 1971 - 1987 | 4 | |
| Olsten, Agnieszka | Agnieszka Olsten | Director | 2006 - 2009 | 7 | |
| Orsky, Gudrun | Gudrun Orsky | Director | 2004 | 1 | |
| Ott, Sharon | Sharon Ott | Director | 1993 - 1997 | 3 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz | Director | 1972 | 1 | |
| Oittinen, Tytti | Tytti Oittinen | Director | 1992 - 1994 | 2 | |
| O'Connor, John | John O'Connor | Director | 2003 | 1 | |
| Orlandini, Claudio | Claudio Orlandini | Director | 2011 | 1 | |
| Ochandiano, Amelia | Amelia Ochandiano | Director | 2010 - 2011 | 40 | |
| O'Leary, Bridget Kathleen | Bridget Kathleen O'Leary | Director | 2011 | 1 | |
| Oscar, Harry | Harry Oscar | Director | 1900 | 1 | |
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