Name  | Functions | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Y. Ono | Dramaturg | 2008 - 2009 | 3 | |||
| Shuji Onodera | Director | 2013 | 1 | |||
| Stefano Onofri | Actor | 1991 | 1 | |||
| Mr. Onorato | Actor | 1893 | 2 | |||
| Maren K. Onsaker | Actor | 1998 | 2 | |||
| Alexander Onslow | Actor | 1932 | 1 | |||
| Michael Onslow | Actor | 1999 | 30 | |||
| Ole Onsøjen | Musical Director | 1906 | 1 | |||
| Kari Onstad | Actor | 1976 - 2018 | 60 | 6 | ||
| Per Onsum | Actor | 1962 - 1965 | 4 | |||
| Montserrat Ontiveros | Actor | 2006 | 2 | |||
| Toby Onwumere | Actor | 2014 | 1 | |||
| Uton Onyejekwe | Actor | 2017 | 1 | |||
| Mike Ooi | Actor | 2022 | 1 | |||
| Johan Ooms | Actor | 1975 - 1981 | 3 | |||
| Richard Ooms | Actor | 1983 - 2008 | 10 | 1 | ||
| Mark Oosterveen | Actor | 2012 | 1 | |||
| Nora Oosterwijk | Actor | 1956 - 1957 | 3 | |||
| Peter Oosthoek | Actor | 1992 | 1 | |||
| Nelly Oosthout | Actor | 1928 - 1930 | 2 | |||
| Anne Oostveen | Actor | 1978 | 1 | |||
| Theo Op de Beeck | Actor | 1961 | 1 | |||
| Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |||
| Eva Opaker | Actor | 1973 | 1 | 1 | ||
| Bartosz Opania | Actor | 1997 | 1 | |||
| Karina Opdal | Actor | 2000 | 2 | |||
| Kristin Aafløy Opdan | Actor | 1996 - 2013 | 2 | |||
| Ivy Opdyke | Actor | 2018 | 1 | |||
| Herman Ljung Opedal | Actor | 2010 | 3 | |||
| Janel Opeka | Costume Designer | 2003 | 1 | |||
| Mr. Opel | Actor | 1898 | 1 | |||
| Rudolf Opel | Actor | 1901 - 1910 | 3 | |||
| H. Kevin Opela | Actor | 1996 | 1 | |||
| Yvonne Opffer | Actor | 1987 | 1 | |||
| Heinz Opfinger | Actor | 1990 - 1991 | 2 | |||
| Alen Opgaard | Designer | 1939 | 1 | |||
| Carleton Opgaard | Actor | 1939 | 1 | |||
| Gustav Opgaard | Designer | 1939 | 1 | |||
| John Opgaard | Actor, Designer | 1939 | 2 | |||
| Rosella Opgaard | Actor | 1939 | 1 | |||
| Vivian Opgaard | Actor | 1939 | 1 | |||
| Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |||