| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| Orlenev, Pavel | Pavel Orlenev | Actor, Director | 1903 - 1923 | 7 | |
| Otto, Alex, | Alex Otto | Actor, Director, Playwright | 1898 - 1934 | 21 | |
| Oscar, Henry | Henry Oscar | Actor, Director, Producer | 1930 | 4 | |
| Oswald, Richard, | Richard Oswald | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Ohkubo , Ryoichi | Ryoichi Ohkubo | Actor, Director, Translator | 1996 - 2006 | 4 | |
| Oertzen, Dietrich v. | Dietrich v. Oertzen | Actor, Dramaturg, Translator | 1981 | 3 | |
| Overbury, Fran | Fran Overbury | Actor, Musical Director | 2001 | 5 | |
| Olausson, Hilde, | Hilde Olausson | Actor, Musician | 1985 - 2015 | 8 | 2 |
| Oscarsson, Ulrika | Ulrika Oscarsson | Actor, Musician | 2001 | 3 | |
| Organ, Alex | Alex Organ | Actor, Sound Designer | 2002 | 2 | |
| Orak, Aydin | Aydin Orak | Actor, Translator | 2010 | 16 | 2 |
| Otrembowa, Julia, | Julia Otrembowa | Actor, Translator | 1883 - 1899 | 4 | |
| Oranowski, Bronisław, | Bronisław Oranowski | Actor, Translator | 1907 - 1911 | 3 | |
| O'Lochlainn, Gearoid | Gearoid O'Lochlainn | Actor, Translator | 1928 - 2009 | 2 | |
| Ollén, Gunnar, | Gunnar Ollén | Adaptation | 1947 - 2005 | 2 | |
| O’Rowe, Mark | Mark O’Rowe | Adaptation | 2015 | 1 | |
| Osztovits, Cecilia | Cecilia Osztovits | Adaptation | 2002 | 1 | |
| Oxenvad, Ann Sofie | Ann Sofie Oxenvad | Adaptation | 2003 | 1 | |
| Oakes, Robert | Robert Oakes | Adaptation | 2009 | 1 | |
| O’Hearn, Nigel | Nigel O’Hearn | Adaptation | 2011 - 2016 | 4 | |
| O'Rowe, Mark | Mark O'Rowe | Adaptation | 2016 | 1 | |
| O'Horn, Nigel | Nigel O'Horn | Adaptation | 2017 | 1 | |
| Otten, Joe | Joe Otten | Adaptation | 2018 | 1 | |
| Orlikowsky, Wazlaw | Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 | 3 | |
| Oikonomopoulou, Pepi | Pepi Oikonomopoulou | Adaptation, Director | 2006 | 2 | |
| Oschlag, Jakob | Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | |
| Orsmaa, Taisto-Bertil | Taisto-Bertil Orsmaa | Adaptation, Director | 1983 - 1996 | 3 | |
| Olwagen, Christiaan | Christiaan Olwagen | Adaptation, Director | 2015 - 2016 | 4 | |
| O'Reilly, Vincent, A. | Vincent A. O'Reilly | Adaptation, Director | 2012 | 2 | |
| Ostermeier, Thomas, | Thomas Ostermeier | Adaptation, Director, Translator | 2002 - 2019 | 229 | |
| Olsen, Ragnar, | Ragnar Olsen | Adaptation, Translator | 1994 - 2015 | 48 | |
| Osborne, John | John Osborne | Adaptation, Translator | 1972 - 2011 | 8 | |
| Oldenhof, Bouke | Bouke Oldenhof | Adaptation, Translator | 1999 | 2 | |
| Olsoni, Kristin | Kristin Olsoni | Assistant Director | 1991 - 2006 | 2 | |
| Oestereich, Tilman | Tilman Oestereich | Assistant Director | 2013 | 1 | |
| Odağ, Efsane | Efsane Odağ | Assistant Director | 2019 | 1 | |
| Oberhäußer, Frank | Frank Oberhäußer | Assistant Director | 2006 | 1 | |
| Orlovsky, Claudia | Claudia Orlovsky | Choreographer | 1998 | 1 | |
| O'Kelly, Geri | Geri O'Kelly | Choreographer | 1993 | 1 | |
| Oscar, - | - Oscar | Choreographer | 2006 | 1 | |
| Owen, Sally | Sally Owen | Choreographer | 2010 | 1 | |
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