| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| Orr, Lynn E. | Lynn E. Orr | Designer, Director, Lighting Designer | 1937 | 3 | |
| Orlandini, C. | C. Orlandini | Actor | 1891 - 1892 | 3 | |
| Otremba, Adolf | Adolf Otremba | Translator | 1882 - 1883 | 3 | |
| Olszewski, Edward | Edward Olszewski | Actor | 1894 - 1902 | 3 | |
| Opel, Rudolf | Rudolf Opel | Actor | 1901 - 1910 | 3 | |
| Otto, Marg. | Marg. Otto | Actor | 1906 - 1908 | 3 | |
| Oppermann, Leonore | Leonore Oppermann | Actor | 1919 - 1922 | 3 | |
| Osten, Käte | Käte Osten | Actor | 1919 - 1923 | 3 | |
| Ohlsen, Castora | Castora Ohlsen | Actor | 1902 - 1909 | 3 | |
| Osmond, Clara | Clara Osmond | Actor | 1906 - 1907 | 3 | |
| Oranowski, Bronisław | Bronisław Oranowski | Actor, Translator | 1907 - 1911 | 3 | |
| Ogińska, Antonina | Antonina Ogińska | Actor | 1908 - 1910 | 3 | |
| Olsen, Mikkel Are | Mikkel Are Olsen | Actor | 1995 - 2007 | 3 | |
| Osuldsen, Johan | Johan Osuldsen | Choreographer | 1998 - 2000 | 3 | |
| Ormset, Marie | Marie Ormset | Actor | 2002 | 3 | |
| Offord, Hilde Svennevig | Hilde Svennevig Offord | Actor | 2002 - 2007 | 3 | 1 |
| Opheim, Lea Basch | Lea Basch Opheim | Actor | 2009 - 2011 | 3 | |
| Opedal, Herman Ljung | Herman Ljung Opedal | Actor | 2010 | 3 | |
| Offerdal, Sindre Strand | Sindre Strand Offerdal | Actor | 2012 - 2015 | 3 | |
| Odstrčilová, Liběna | Liběna Odstrčilová | Actor | 1913 - 1922 | 3 | |
| Olsson, Thomas | Thomas Olsson | Actor | 1998 - 2017 | 3 | 1 |
| Ooms, Johan | Johan Ooms | Actor | 1975 - 1981 | 3 | |
| Orešković, Želimir | Želimir Orešković | Director | 1975 - 1989 | 3 | 1 |
| Oertzen, Dietrich v. | Dietrich v. Oertzen | Actor, Dramaturg, Translator | 1981 | 3 | |
| Osmund, Alfred | Alfred Osmund | Actor | 1926 - 1933 | 3 | |
| Oelrich, Matthias | Matthias Oelrich | Actor | 1983 - 2006 | 3 | |
| Olesen, Henning | Henning Olesen | Actor | 1983 - 2010 | 3 | 1 |
| O'Reilly, John | John O'Reilly | Actor | 1983 | 3 | |
| Orr, Madeleine | Madeleine Orr | Actor | 1970 | 3 | |
| Orsmaa, Taisto-Bertil | Taisto-Bertil Orsmaa | Adaptation, Director | 1983 - 1996 | 3 | 1 |
| Olariu, Dana | Dana Olariu | Actor | 2009 - 2015 | 3 | |
| Osterberg, Craig | Craig Osterberg | Actor, Designer, Lighting Designer | 2009 | 3 | |
| Odvárková, Lenka | Lenka Odvárková | Designer | 2009 - 2011 | 3 | |
| Oviedo, Alejandra | Alejandra Oviedo | Actor | 2012 - 2013 | 3 | 1 |
| Osvald, Aksel | Aksel Osvald | Actor | 1933 - 1935 | 3 | |
| Oechsner, Susanne | Susanne Oechsner | Actor | 1985 | 3 | |
| Olsen, Trygve | Trygve Olsen | Lighting Designer | 1985 - 1987 | 3 | 1 |
| O'Keefe, Nathan | Nathan O'Keefe | Actor | 2008 - 2017 | 3 | |
| O'Connor, Paul, Vincent | Paul Vincent O'Connor | Actor | 1990 | 3 | |
| Ottmann, Anna | Anna Ottmann | Actor | 1992 - 2000 | 3 | 1 |
| Olmo, Francisco | Francisco Olmo | Actor | 1982 | 3 | |
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