| Opstad, Peder | Peder Opstad | Actor, Adaptation, Director, Producer | 2005 - 2010 | 183 | |
| Oliveira, Domingos, José Soares de | Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |
| Op gen Orth, Helga | Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |
| Ohshima, Nobuhisa | Nobuhisa Ohshima | Actor, Adaptation, Director | 1994 | 3 | |
| Olson, Niclas | Niclas Olson | Actor, Adaptation, Director | 2017 | 3 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Oudrey, Pierre | Pierre Oudrey | Actor | 1973 | 1 | |
| Olney, Joseph | Joseph Olney | Actor | 1938 | 1 | |
| Ozerova, E A | E A Ozerova | Actor | 1907 | 1 | |
| Orloff, Nicholas | Nicholas Orloff | Actor | 1908 | 1 | 1 |
| Olsen, Inga | Inga Olsen | Actor | 1877 - 1908 | 101 | 1 |
| Ohmori, Kikuyo | Kikuyo Ohmori | Actor | 1993 | 1 | |
| Ohberg, Åke | Åke Ohberg | Actor | 1954 | 1 | |
| Oberkogler, Cornelia | Cornelia Oberkogler | Actor | 1959 | 1 | 1 |
| Oberska, Irena | Irena Oberska | Actor | 1958 | 1 | |
| Oddvar, August | August Oddvar | Actor | 1900 - 1954 | 108 | 1 |
| Odstrčilová, Liběna | Liběna Odstrčilová | Actor | 1919 - 1932 | 6 | |
| Oesch, Ditta | Ditta Oesch | Actor | 1944 | 1 | |
| Off, Marcus | Marcus Off | Actor | 2002 | 1 | 1 |
| Ogawa, Keiko | Keiko Ogawa | Actor | 1999 - 2012 | 16 | |
| Ohlin, Jonas | Jonas Ohlin | Actor | 1999 | 1 | |
| Ohtake, Shinobu | Shinobu Ohtake | Actor | 1991 | 1 | |
| Oka, Mizuho | Mizuho Oka | Actor | 1928 | 1 | |
| Okopiński, Marek | Marek Okopiński | Actor | 1958 | 1 | |
| Okraska, Paweł | Paweł Okraska | Actor | 1999 | 1 | |
| Okura, Shonosuke | Shonosuke Okura | Actor | 2005 - 2013 | 14 | |
| Olchowska, (Nuna) Młodziejowska | (Nuna) Młodziejowska Olchowska | Actor | 1905 - 1907 | 2 | |
| Olderkjær, Stian | Stian Olderkjær | Actor | 2006 | 1 | |
| Olenicki, Manfred | Manfred Olenicki | Actor | 1995 - 1998 | 3 | |
| Olschansky, Aage | Aage Olschansky | Actor | 1981 | 1 | |
| Olsen, Augusta | Augusta Olsen | Actor | 1907 | 10 | |
| Omdal, Odin Hørthe | Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | 1 |
| Ongjerth, Zsuzsanna | Zsuzsanna Ongjerth | Actor | 1960 | 1 | |
| Ono, Masutaro | Masutaro Ono | Actor | 1913 | 1 | |
| Ono, Mizuho | Mizuho Ono | Actor | 1997 | 1 | |
| Onslow, Michael | Michael Onslow | Actor | 1999 | 30 | |
| Opsann, Aksel | Aksel Opsann | Actor | 1900 - 1928 | 66 | |
| Orberg, Lisa | Lisa Orberg | Actor | 1974 | 1 | |
| Orchis, Isella | Isella Orchis | Actor | 1993 - 2013 | 4 | |
| Orenstein, Sarah | Sarah Orenstein | Actor | 2004 | 1 | 1 |
| Orlik, Stanisław | Stanisław Orlik | Actor | 1904 - 1924 | 4 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1904 - 1916 | 9 | |
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