| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| 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 | ||
| Thomas Olsson | Actor | 1998 - 2017 | 3 | 1 | ||
| Gunilla Orvelius | Actor | 1992 - 2002 | 27 | 1 | ||
| Elvira Onetto | Actor | 2009 - 2011 | 13 | 1 | ||
| Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | 1 | ||
| Želimir Orešković | Director | 1975 - 1989 | 3 | 1 | ||
| Virgil Ogăşanu | Actor | 1969 - 2006 | 6 | 1 | ||
| Eva Opaker | Actor | 1973 | 1 | 1 | ||
| Ladislav Obuch | Translator | 1955 - 2021 | 14 | 1 | ||
| Ilaria Occhini | Actor | 1981 - 2005 | 19 | 1 | ||
| Kipp Osborne | Actor | 1976 | 1 | 1 | ||
| Jens Okking | Actor | 1979 - 1984 | 4 | 1 | ||
| John Osborne | Adaptation, Translator | 1972 - 2011 | 8 | 1 | ||
| Patricia O'Donnell | Actor | 1981 | 4 | 1 | ||
| Richard Ooms | Actor | 1983 - 2008 | 10 | 1 | ||
| Henning Olesen | Actor | 1983 - 2010 | 3 | 1 | ||
| Ary Oechslin | Costume Designer, Designer | 1952 - 1978 | 11 | 1 | ||
| Taisto-Bertil Orsmaa | Adaptation, Director | 1983 - 1996 | 3 | 1 | ||
| Janet Owusu | Director | 2006 | 1 | 1 | ||