| Oppermann, Peter | Peter Oppermann | Dramaturg | 2000 | 1 | |
| Ohmen, Kristina | Kristina Ohmen | Dramaturg | 2018 | 1 | |
| Ohoka, Kinji | Kinji Ohoka | Director, Translator | 1971 | 2 | |
| Orme, Michael | Michael Orme (Michael Orme) | Director, Producer | 1930 - 1936 | 5 | |
| Oppenheim, Yoni | Yoni Oppenheim (Yoni Oppenheim) | Director, Producer | 2011 | 2 | |
| Okada, Kazuo | Kazuo Okada | Director, Musical Director | 1969 - 1978 | 2 | |
| O´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Ohgitani, Kunio | Kunio Ohgitani (Kunio Ohgitani) | Director | 1980 | 1 | |
| Osmanov, Bahram | Bahram Osmanov (Bahram Osmanov) | Director | 2006 | 1 | |
| Olsson, Lennart | Lennart Olsson (Lennart Olsson) | Director | 1971 - 1987 | 4 | |
| Olsten, Agnieszka | Agnieszka Olsten (Agnieszka Olsten) | Director | 2006 - 2009 | 7 | |
| Orsky, Gudrun | Gudrun Orsky (Gudrun Orsky) | Director | 2004 | 1 | |
| Ott, Sharon | Sharon Ott (Sharon Ott) | Director | 1993 - 1997 | 3 | |
| Orsza-Łukasiewicz, Janina | Janina Orsza-Łukasiewicz (Janina Orsza-Łukasiewicz) | Director | 1972 | 1 | |
| Oittinen, Tytti | Tytti Oittinen (Tytti Oittinen) | Director | 1992 - 1994 | 2 | |
| O'Connor, John | John O'Connor (John O'Connor) | Director | 2003 | 1 | |
| Orlandini, Claudio | Claudio Orlandini (Claudio Orlandini) | Director | 2011 | 1 | |
| Ochandiano, Amelia | Amelia Ochandiano (Amelia Ochandiano) | Director | 2010 - 2011 | 40 | |
| O'Leary, Bridget Kathleen | Bridget Kathleen O'Leary (Bridget Kathleen O'Leary) | Director | 2011 | 1 | |
| Oscar, Harry | Harry Oscar (Harry Oscar) | Director | 1900 | 1 | |
| Oberländer, Hans | Hans Oberländer (Hans Oberländer) | Director | 1904 - 1908 | 2 | |
| O'Neil, Barry | Barry O'Neil (Barry O'Neil) | Director | 1909 | 1 | |
| Osanai, Kaoru | Kaoru Osanai (Kaoru Osanai) | Director | 1909 - 1928 | 6 | |
| Olafsen, Carl Fredrik | Carl Fredrik Olafsen (Carl Fredrik Olafsen) | Director | 2010 | 1 | |
| Ostrowsky, Hartmut | Hartmut Ostrowsky | Director | 1975 | 1 | |
| Orešković, Želimir | Želimir Orešković | Director | 1975 - 1989 | 3 | |
| Ognjanović, Aleksandar | Aleksandar Ognjanović | Director | 1955 - 1979 | 4 | |
| Olschok, Herbert | Herbert Olschok | Director | 1988 - 2014 | 5 | |
| Oglesby, Marshall | Marshall Oglesby | Director | 1973 | 1 | |
| Oľha, Matúš | Matúš Oľha | Director | 1993 | 1 | |
| Owusu, Janet | Janet Owusu | Director | 2006 | 1 | |
| Ojala, Timo | Timo Ojala | Director | 1985 | 1 | |
| 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 | |
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