| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Lennart Olsson | Director | 1971 - 1987 | 4 | |||
| Agnieszka Olsten | Director | 2006 - 2009 | 7 | |||
| Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | |||
| Zsuzsanna Ongjerth | Actor | 1960 | 1 | |||
| Masutaro Ono | Actor | 1913 | 1 | |||
| Mizuho Ono | Actor | 1997 | 1 | |||
| Michael Onslow | Actor | 1999 | 30 | |||
| Aksel Opsann | Actor | 1900 - 1928 | 66 | |||
| Het Oranjehotel | ||||||
| Lisa Orberg | Actor | 1974 | 1 | |||
| Isella Orchis | Actor | 1993 | 2 | |||
| Sarah Orenstein | Actor | 2004 | 1 | |||
| Alex Organ | Actor, Sound Designer | 2002 | 2 | |||
| Stanisław Orlik | Actor | 1904 - 1924 | 4 | |||
| Janusz Orliński | Actor | 1904 - 1916 | 9 | |||
| Penny Orloff | Actor | 1982 | 1 | |||
| Claudia Orlovsky | Choreographer | 1998 | 1 | |||
| Michael Orme | Director, Producer | 1930 - 1936 | 5 | |||
| Claire Ormond | Actor | 1993 | 1 | |||
| Diane Orr | Actor | 1979 | 1 | |||
| Gudrun Orsky | Director | 2004 | 1 | |||
| Elisabeth Orth | Actor | 1971 - 1995 | 6 | |||
| Elmar Osborn | Actor | 1955 | 1 | |||
| Dorithy Osborne | Actor | 1943 | 1 | |||
| Si Osborne | Actor | 2001 | 2 | |||
| Henry Oscar | Actor, Director, Producer | 1930 - 1947 | 5 | |||
| in Oslo | ||||||
| Leni Osswald | Costume Designer | 1955 - 1962 | 2 | |||
| Christine Ostermayer | Actor | 1965 - 1969 | 3 | |||
| Axsel Oswald | Actor | 1936 - 1937 | 2 | |||
| Günther Ott | Actor | 1931 | 1 | |||
| Sharon Ott | Director | 1993 - 1997 | 3 | |||
| John Ottavino | Actor | 1997 | 1 | |||
| Otto Ottbert | Actor, Director | 1876 - 1906 | 7 | |||
| Helle Ottesen | Actor | 1975 - 2013 | 7 | |||
| Alexander Otto | Actor, Designer | 1919 - 1966 | 7 | |||
| Harald Otto | Actor, Director | 1896 - 1922 | 55 | |||
| Miranda Otto | Actor | 2002 - 2015 | 2 | |||
| Pavel Otto | Actor | 1957 | 1 | |||
| Wilfried Otto | Designer | 1958 | 1 | |||
| Georges Ourth | Actor, Director | 1978 - 1984 | 2 | |||
| Régis Outin | Actor | 1928 - 1978 | 4 | |||