| Ostrowicz, Kazimierz | Kazimierz Ostrowicz | Actor | 1975 | 1 | |
| Ostrowska, Franciszka | Franciszka Ostrowska | Actor | 1910 | 2 | |
| Ostrowski, Andrew David | Andrew David Ostrowski | Lighting Designer | 2005 - 2007 | 2 | |
| Ostrowski, Janusz | Janusz Ostrowski | Actor | 1975 | 2 | |
| Ostrowsky, Hartmut | Hartmut Ostrowsky | Director | 1975 | 1 | |
| Ostrugnaj, Anton | Anton Ostrugnaj | Actor | 2002 | 2 | |
| Ostužev, Aleksandr, Alekseevic | Aleksandr Alekseevic Ostužev | Actor | 1909 | 1 | |
| Ostwald, Frank | Frank Ostwald | Actor | 1917 - 1937 | 5 | |
| Osuldsen, Johan | Johan Osuldsen | Choreographer | 1998 - 2000 | 3 | |
| Osvald, Aksel | Aksel Osvald | Actor | 1933 - 1935 | 3 | |
| Osvik, Erik Baltzek | Erik Baltzek Osvik | Actor | 2012 | 1 | |
| Oswald, Axsel | Axsel Oswald | Actor | 1936 - 1937 | 2 | |
| Oswald, Birgit | Birgit Oswald | Actor | 1993 | 1 | |
| Oswald, Christof | Christof Oswald | Actor | 1996 | 1 | |
| Oswald, Cornelius | Cornelius Oswald | Designer | 2014 | 1 | 1 |
| Oswald, David | David Oswald | Director | 1993 | 1 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Oswald, Richard | Richard Oswald | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Oswald, Simone | Simone Oswald | Actor | 2006 | 1 | |
| Oszke, - | - Oszke | Actor | 1928 | 1 | |
| Oszter, Sándor | Sándor Oszter | Actor | 1978 - 2007 | 2 | 1 |
| Osztovits, Cecilia | Cecilia Osztovits | Adaptation | 2002 | 1 | 1 |
| Otáhalová, Lída | Lída Otáhalová | Actor | 1922 | 1 | |
| Otaka, Akira | Akira Otaka (大鷹明良) | Actor | 2022 | 2 | |
| Otani, Hayato | Hayato Otani | Lighting Designer | 2006 | 2 | |
| Otani, Ro | Ro Otani | Actor | 2006 | 1 | |
| Otava, Zdeněk | Zdeněk Otava | Actor | 1941 | 1 | |
| Otčenášek, Štěpán | Štěpán Otčenášek | Dramaturg | 2013 | 3 | |
| Otegui, Juan José | Juan José Otegui | Actor | 1969 | 1 | |
| Otenbacher, Margot | Margot Otenbacher | Actor | 1959 | 1 | |
| Otermin, Sara | Sara Otermin | Actor | 1997 | 1 | |
| Otero, Cachi | Cachi Otero | Costume Designer | 1971 | 3 | |
| Otero, Clementina | Clementina Otero | Actor | 1944 | 1 | |
| Oteyza, Ramón | Ramón Oteyza | Actor | 1975 | 1 | |
| Otieno, Mercy Dorcas | Mercy Dorcas Otieno | Actor | 2021 | 2 | |
| Otis, Charles | Charles Otis | Actor | 1925 | 1 | |
| Otis, Edith | Edith Otis | Actor | 1905 | 1 | |
| Otis, Elita Proctor | Elita Proctor Otis | Actor | 1903 | 13 | |
| Otis, James | James Otis | Actor | 1991 | 1 | |
| Otnes, Ola | Ola Otnes | Actor | 1981 - 2020 | 128 | 3 |
| Otnes, Simen M. | Simen M. Otnes | Actor | 2003 | 1 | |
| Otogawa, Tatsuko | Tatsuko Otogawa | Technician | 2025 | 1 | |
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