| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| 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 - 1930 | 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 - 1898 | 5 | |||
| C. Orlandini | Actor | 1891 - 1892 | 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 - 2004 | 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 - 1929 | 13 | |||
| Mahin Oskui | Actor, Director | 1959 | 2 | |||
| Otto - | Composer | 2002 | 1 | |||
| David Orneallas | Actor | 2011 | 1 | |||
| Helene Odilon | Actor | 1894 | 1 | |||
| Jules Odendahl-James | Dramaturg | 2011 | 1 | |||
| Sally Owen | Choreographer | 2010 | 1 | |||
| Ida Orloff | Actor | 1905 - 1942 | 26 | |||
| Erich Otto | Actor | 1920 - 1921 | 2 | |||
| Roald Ottesen | Lighting Designer | 1972 | 1 | |||
| Rhoda Ofori-Attah | Actor | 2011 | 1 | |||
| Amelia Ochandiano | Director | 2010 - 2011 | 40 | |||
| Frank O'Grady | Actor | 1932 | 1 | |||