| Oftedahl, Ole | Ole Oftedahl | Actor, Dancer | 1928 | 2 | |
| Ocampo, Paul | Paul Ocampo | Actor, Dancer | 2001 | 2 | |
| Olympios, Spyros | Spyros Olympios | Actor, Dancer | 1935 - 1997 | 10 | |
| Olsson, Yean | Yean Olsson | Actor, Costume Designer | 1997 | 4 | |
| O'Rourke, Joan | Joan O'Rourke | Actor, Costume Designer | 1945 - 1961 | 4 | |
| Olsen, Ole | Ole Olsen (Ole Olsen) | Actor, Composer | 1895 - 1922 | 18 | 1 |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| Osazuwa, Evelyn, Rasmussen | Evelyn Rasmussen Osazuwa | Actor, Composer | 2018 - 2019 | 4 | |
| O’Connell, Sara | Sara O’Connell | Actor, Choreographer, Dancer | 2004 | 4 | |
| O'Mahoney, Robert | Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |
| Olinescu, Boris | Boris Olinescu | Actor, Assistant Director | 1959 | 2 | |
| Opstad, Peder | Peder Opstad (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 | |
| Odeen-Isbister, Sara | Sara Odeen-Isbister | Actor, Adaptation | 2020 | 2 | |
| Oudrey, Pierre | Pierre Oudrey (Pierre Oudrey) | Actor | 1973 | 1 | |
| Olney, Joseph | Joseph Olney (Joseph Olney) | Actor | 1938 | 1 | |
| Ozerova, E A | E A Ozerova (E A Ozerova) | Actor | 1907 | 1 | |
| Orloff, Nicholas | Nicholas Orloff (Nicholas Orloff) | Actor | 1908 | 1 | |
| Olsen, Inga | Inga Olsen (Inga Olsen) | Actor | 1877 - 1908 | 101 | |
| Ohmori, Kikuyo | Kikuyo Ohmori (Kikuyo Ohmori) | Actor | 1993 | 1 | |
| Ohberg, Åke | Åke Ohberg (Åke Ohberg) | Actor | 1954 | 1 | |
| Oberkogler, Cornelia | Cornelia Oberkogler (Cornelia Oberkogler) | Actor | 1959 | 1 | |
| Oberska, Irena | Irena Oberska (Irena Oberska) | Actor | 1958 | 1 | |
| Oddvar, August | August Oddvar (August Oddvar) | Actor | 1900 - 1954 | 108 | |
| Odstrčilová, Liběna | Liběna Odstrčilová (Liběna Odstrčilová) | Actor | 1919 - 1932 | 6 | |
| Oesch, Ditta | Ditta Oesch (Ditta Oesch) | Actor | 1944 | 1 | |
| Off, Marcus | Marcus Off (Marcus Off) | Actor | 2002 | 1 | |
| Ogawa, Keiko | Keiko Ogawa (Keiko Ogawa) | Actor | 1999 - 2012 | 16 | |
| Ohlin, Jonas | Jonas Ohlin (Jonas Ohlin) | Actor | 1999 | 1 | |
| Ohtake, Shinobu | Shinobu Ohtake (Shinobu Ohtake) | Actor | 1991 | 1 | |
| Oka, Mizuho | Mizuho Oka (Mizuho Oka) | Actor | 1928 | 1 | |
| Okopiński, Marek | Marek Okopiński (Marek Okopiński) | Actor | 1958 | 1 | |
| Okraska, Paweł | Paweł Okraska (Paweł Okraska) | Actor | 1999 | 1 | |
| Okura, Shonosuke | Shonosuke Okura (Shonosuke Okura) | Actor | 2005 - 2013 | 14 | |
| Olchowska, (Nuna) Młodziejowska | (Nuna) Młodziejowska Olchowska ((Nuna) Młodziejowska Olchowska) | Actor | 1905 - 1907 | 2 | |
| Olderkjær, Stian | Stian Olderkjær (Stian Olderkjær) | Actor | 2006 | 1 | |
| Olenicki, Manfred | Manfred Olenicki (Manfred Olenicki) | Actor | 1995 - 1998 | 3 | |
| Olschansky, Aage | Aage Olschansky (Aage Olschansky) | Actor | 1981 | 1 | |
|
|
