| Okazaki, Tomomi | Tomomi Okazaki | Actor | 1967 | 1 | |
| Olthy, Magda | Magda Olthy | Actor | 1939 | 1 | |
| Otto, Anneliese | Anneliese Otto | Actor | 1966 | 1 | |
| Ott, Ludwig | Ludwig Ott | Actor | 1966 | 1 | |
| O'Connell, Hans | Hans O'Connell | Actor | 1966 | 1 | |
| Ohlsson, Marrit | Marrit Ohlsson | Actor | 1947 - 1966 | 2 | |
| Oglesby, Aaron | Aaron Oglesby | Actor | 1966 | 1 | |
| Otto, Franz | Franz Otto | Actor | 1917 - 1924 | 3 | |
| Oeser, Wolfgang | Wolfgang Oeser | Actor | 1966 | 1 | |
| Ott, Isabella | Isabella Ott | Actor | 1966 | 1 | |
| Olson, James | James Olson | Actor | 1966 | 1 | |
| Opřátko, Jiří | Jiří Opřátko | Actor | 1965 | 1 | |
| Owens, James, D. | James D. Owens | Actor | 1965 | 1 | |
| Orley, Ray | Ray Orley | Actor | 1965 | 1 | |
| Olwagen, Christiaan | Christiaan Olwagen | Adaptation, Director | 2015 - 2016 | 4 | |
| Orosz, Helga | Helga Orosz | Actor | 2005 | 2 | |
| Ohhinata, Minoru | Minoru Ohhinata | Actor | 2002 | 1 | |
| Okazaki, Kazuhiko | Kazuhiko Okazaki | Actor | 2002 | 1 | |
| Olsavszky, Éva | Éva Olsavszky | Actor | 2002 | 1 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | |
| O'Byrne, Adam | Adam O'Byrne | Actor | 2002 | 1 | |
| Otto, Philipp | Philipp Otto | Actor | 2002 - 2015 | 11 | |
| Orlemann, Jed | Jed Orlemann | Actor | 2002 | 4 | |
| Olmsted, Richard | Richard Olmsted | Designer, Lighting Designer | 2002 - 2003 | 3 | |
| Otte, Jehuda | Jehuda Otte | Actor | 2002 | 1 | |
| Oggenfuss, Michael | Michael Oggenfuss | Designer, Lighting Designer | 2002 - 2004 | 66 | |
| Odor, Josh | Josh Odor | Actor | 2002 | 1 | |
| Ocel, Tim | Tim Ocel | Director | 2002 | 1 | |
| Otto, Hermann | Hermann Otto | Translator | 2002 | 1 | |
| Oliver, Simon | Simon Oliver | Designer | 2002 | 1 | |
| Ostertag, Dietger | Dietger Ostertag | Actor | 2002 | 1 | |
| Ostrugnaj, Anton | Anton Ostrugnaj | Actor | 2002 | 2 | |
| Oberhof, Valerie | Valerie Oberhof | Actor | 2002 - 2012 | 6 | |
| Oestreicher, Samantha | Samantha Oestreicher | Actor | 2002 | 1 | |
| Osztovits, Cecilia | Cecilia Osztovits | Adaptation | 2002 | 1 | |
| ouloupaki, Niki | Niki ouloupaki | Actor | 2002 | 1 | |
| Offord, John | John Offord | Lighting Designer | 2002 | 1 | |
| O'Berski, Jay | Jay O'Berski | Actor | 2002 | 1 | |
| Ott, Marcel | Marcel Ott | Actor | 2002 | 2 | |
| Okada, Yoko | Yoko Okada | Actor | 1997 | 1 | |
| Olszówka, Edyta | Edyta Olszówka | | | | |
| Olszówka, Edyta | Edyta Olszówka | Actor | 1997 | 1 | |
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