| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Eileen O'Brien | Actor | 2000 | 8 | 1 | ||
| Nils Ole Oftebro | Actor | 1970 - 2018 | 92 | 1 | ||
| Jørn Ording | Actor, Director | 1938 - 1978 | 69 | 1 | ||
| Tytti Oittinen | Director | 1992 - 1994 | 2 | 1 | ||
| Sverre Anker Ousdal | Actor | 1983 - 2020 | 40 | 1 | ||
| Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | 1 | ||
| Peter O'Brien | Actor | 2002 | 1 | 1 | ||
| Johann Adam Oest | Actor | 1977 - 2004 | 4 | 1 | ||
| Yoni Oppenheim | Director, Producer | 2011 | 2 | 1 | ||
| Mahin Oskui | Actor, Director | 1959 | 2 | 1 | ||
| Michael Oliver | Actor | 2011 | 1 | 1 | ||
| Bror Olsson | Actor | 1877 - 1928 | 20 | 1 | ||
| Hans Orlamundt | Actor | 1877 - 1880 | 13 | 1 | ||
| Vilhelm Olin | Actor, Director | 1886 - 1919 | 4 | 1 | ||
| Leonard Outram | Actor, Director | 1891 - 1897 | 7 | 1 | ||
| Olive Oliver | Actor | 1894 - 1904 | 2 | 1 | ||
| Hans Olden | Actor | 1895 | 1 | 1 | ||
| Nils Ostendorf | Composer | 2008 - 2014 | 54 | 1 | ||
| Paula Ottzenn | Actor | 1919 - 1936 | 10 | 1 | ||
| Nance O'Neil | Actor | 1900 - 1917 | 23 | 1 | ||
| Jane Oaker | Actor | 1904 | 1 | 1 | ||
| Piero Ottolini | Translator | 1905 - 1906 | 4 | 1 | ||
| Pavel Orlenev | Actor, Director | 1903 - 1923 | 14 | 1 | ||
| Edyth Olive | Actor | 1906 | 1 | 1 | ||
| Warner Oland | Actor | 1906 - 1908 | 5 | 1 | ||
| William Owen | Actor | 1908 | 1 | 1 | ||
| Kaoru Osanai | Director | 1909 - 1928 | 6 | 1 | ||
| Gunnar Olram | Actor | 1943 - 2006 | 187 | 1 | ||
| Per Ottesen | Actor | 1992 - 2013 | 36 | 1 | ||
| Arvid Ones | Actor, Director | 1983 - 2004 | 22 | 1 | ||
| Ragnar Olsen | Adaptation, Translator | 1994 - 2018 | 58 | 1 | ||
| Anne Marie Ottersen | Actor | 1978 - 2014 | 7 | 1 | ||
| Hilde Svennevig Offord | Actor | 2002 - 2007 | 3 | 1 | ||
| Linda Opsahl | Actor | 2002 | 2 | 1 | ||
| Monica Ohlsson | Dramaturg, Translator | 2005 - 2009 | 8 | 1 | ||
| Lars Otterstedt | Actor | 2006 | 11 | 1 | ||
| Jakob Oftebro | Actor | 2006 - 2022 | 5 | 1 | ||
| Stine Oliversen | Actor | 2009 | 1 | 1 | ||
| Chloé Obolensky | Designer | 2011 | 1 | 1 | ||
| Sigfrid Olander | Actor | 1920 | 1 | 1 | ||
| Lydia Opøien | Actor | 1923 - 2006 | 13 | 1 | ||
| Einar Oen | Actor | 1928 | 1 | 1 | ||