Contributors
| Name | Functions | Event Dates | Event Functions | Resources | ||
|---|---|---|---|---|---|---|
| John O'Connor | Director | 2003 | 1 | |||
| Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | |||
| Peter O'Brien | Actor | 2002 | 1 | |||
| Dennis O'Connell Bak | Actor | 2006 | 1 | |||
| Richárd Ongjerth | Actor | 1960 | 1 | |||
| Tú Oanh | Actor | 2006 - 2010 | 2 | |||
| Michael O'Foghludha | Actor | 2001 | 1 | |||
| Nancy O'Kane | Actor | 1952 - 1961 | 2 | |||
| Timothy O'Brien | Costume Designer, Designer | 1964 - 1996 | 12 | |||
| Maggie Olesen | Actor | 1971 | 1 | |||
| Brenainn O'Callaghan | Actor | 2000 | 1 | |||
| Ricky Oitana | Actor | 1996 | 2 | |||
| James O'Brien | Actor | 1957 - 1971 | 2 | |||
| Patricia O'Connell | Actor | 1975 - 2000 | 2 | |||
| Lynn E. Orr | Designer, Director, Lighting Designer | 1937 | 3 | |||
| Nelly Oosthout | Actor | 1928 | 2 | |||
| Carol O'Connell | Actor | 1963 | 1 | |||
| Yvonne Opffer | Actor | 1987 | 1 | |||
| Toshiko Oze | Actor | 1968 | 1 | |||
| Jolanta Orzechowska | Actor | 1983 | 1 | |||
| Elżbieta Osterwianka | Actor | 1973 | 1 | |||
| Wilhelm Otto | Actor | 1889 - 1897 | 5 | |||
| C. Orlandini | Actor | 1891 | 3 | |||
| Christa Oenicke | Actor | 1958 | 1 | |||
| Inosuke Okada | Lighting Designer | 1934 | 1 | |||
| Noboru Ogawa | Lighting Designer | 1946 | 1 | |||
| Bartłomiej Brat Oleś | Composer | 2006 - 2009 | 7 | |||
| - Oscar | Choreographer | 2006 | 1 | |||
| Beatrice O'Donnell | Actor | 1981 | 1 | |||
| Lubov Orlova | Actor | 1959 | 1 | |||
| B. Olenin | Actor | 1959 | 1 | |||
| Jaye O'Brien | Actor | 1957 | 1 | |||
| Johann Adam Oest | Actor | 1977 - 2006 | 4 | |||
| Yoni Oppenheim | Director, Producer | 2011 | 2 | |||
| Alessandro Otupacca | Actor | 2011 | 1 | |||
| Claudio Orlandini | Director | 2011 | 1 | |||
| Lynne Osbourne | Actor | 2000 | 1 | |||
| Margarethe Otto-Körner | Actor | 1898 - 1900 | 13 | |||
| Mahin Oskui | Actor, Director | 1959 | 2 | |||
| David Orneallas | Actor | 2011 | 1 | |||
| Helene Odilon | Actor | 1894 - 1895 | 1 | |||
| Jules Odendahl-James | Dramaturg | 2011 | 1 | |||