| Name | Functions | Event Dates | Events  | Resources | ||
|---|---|---|---|---|---|---|
| Isabel Osca | Actor | 2001 | 5 | |||
| Baard Owe | Actor | 1964 - 2007 | 5 | |||
| Mark O´Regan | Actor | 1988 | 5 | |||
| Aksel Orav | Actor | 1962 - 1997 | 5 | |||
| Ruth Olsén | Actor | 1995 | 5 | |||
| Fran Overbury | Actor, Musical Director | 2001 | 5 | |||
| Attila Orbán | Actor | 2008 | 5 | |||
| Koji Okukawa | Actor | 2008 - 2010 | 5 | |||
| Eduard Ollinger | Lighting Designer | 2010 - 2012 | 5 | |||
| Mark O'Rowe | Adapter, Director | 2015 - 2025 | 5 | 1 | ||
| Irena Orawiec | Actor | 2014 | 5 | |||
| George Owen | Actor | 1911 - 1912 | 5 | |||
| Anders Ortman | Composer | 2020 | 5 | |||
| Federico Oliver | Director | 1902 - 1908 | 5 | |||
| Armando Ocano | Adaptation | 1975 - 1980 | 5 | |||
| Liběna Odstrčilová | Actor | 1919 - 1932 | 6 | |||
| Elisabeth Orth | Actor | 1971 - 1995 | 6 | |||
| Deirdre O'Connell | Actor, Director | 1971 - 1985 | 6 | |||
| Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | 1 | ||
| E. Orling | Designer | 1895 - 1896 | 6 | |||
| M. Ol'čeva | Actor | 1900 - 1924 | 6 | |||
| Albert Olsen | Actor | 1901 | 6 | |||
| Kaoru Osanai | Director | 1909 - 1928 | 6 | 1 | ||
| Bodil Ousdal | Choreographer | 1985 - 1991 | 6 | |||
| Marit Pedersen Omland | Actor | 1993 | 6 | |||
| Kristina Opsahl | Actor | 2004 - 2006 | 6 | |||
| Ragnhild Owenberg-Lyche | Actor | 1911 - 1922 | 6 | 6 | ||
| Hans Obermüller | Actor | 1971 - 1981 | 6 | |||
| Julius Otto | Actor | 1880 - 1898 | 6 | |||
| Virgil Ogăşanu | Actor | 1969 - 2006 | 6 | 1 | ||
| Lothar Ostermann | Actor | 1960 - 1976 | 6 | |||
| Christopher Oden | Actor, Director | 1984 - 2001 | 6 | 1 | ||
| Nils Bernt Olsen | Actor | 1987 - 1989 | 6 | |||
| Doc O'Brien | Actor | 1991 | 6 | |||
| Wolf Oeser | Actor | 1989 - 1994 | 6 | |||
| Brendan O'Hea | Actor | 1993 - 1999 | 6 | 1 | ||
| Vidal de Oliveira | Translator | 1949 - 1994 | 6 | |||
| Minni Oehl | Actor | 1995 | 6 | |||
| Helmut Oeser | Actor | 1955 - 2003 | 6 | |||
| Christiaan Olwagen | Adaptation, Director | 2015 - 2024 | 6 | |||
| Valerie Oberhof | Actor | 2002 - 2012 | 6 | 1 | ||
| Thomas Oberender | Dramaturg | 2003 - 2004 | 6 | 1 | ||