| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Mieczysław Ostroróg | Actor | 1968 | 2 | |||
| Jan Owen | Actor | 1968 | 1 | |||
| Helmut Oeser | Actor | 1955 - 2003 | 6 | |||
| Otto-Richard Olschewski | Actor | 1968 | 1 | |||
| Karen Oettinger | Actor | 1968 | 2 | |||
| Magda Olty | Actor | 1935 - 1941 | 2 | |||
| Kikuko Ogata | Costume Designer | 1968 - 2010 | 2 | |||
| Brigitte Ornstein | Actor | 1968 | 1 | |||
| Munenori Oyamada | Actor | 1968 | 1 | |||
| Minako Osanai | Actor | 1968 | 1 | |||
| Edith Ottosen | Actor | 1955 - 1967 | 4 | |||
| Alois Ostr | Actor | 1967 | 1 | |||
| Hisao Ogawa | Lighting Designer | 1967 | 1 | |||
| Eric Olson | Actor | 2004 | 1 | |||
| Joe Ouellette | Actor | 2004 | 1 | |||
| Francisco Ortiz | Actor | 2016 | 1 | |||
| Charlotte Owens | Actor | 1967 | 1 | |||
| Kirsti Ortola | Actor | 1955 - 1971 | 4 | |||
| Tomomi Okazaki | Actor | 1967 | 1 | |||
| Magda Olthy | Actor | 1939 | 1 | |||
| Anneliese Otto | Actor | 1966 | 1 | |||
| Ludwig Ott | Actor | 1966 | 1 | |||
| Hans O'Connell | Actor | 1966 | 1 | |||
| Marrit Ohlsson | Actor | 1947 - 1966 | 2 | |||
| Aaron Oglesby | Actor | 1966 | 1 | |||
| Franz Otto | Actor | 1917 - 1924 | 3 | |||
| Wolfgang Oeser | Actor | 1966 | 1 | |||
| Isabella Ott | Actor | 1966 | 1 | |||
| James Olson | Actor | 1966 | 1 | |||
| Jiří Opřátko | Actor | 1965 | 1 | |||
| James D. Owens | Actor | 1965 | 1 | |||
| Ray Orley | Actor | 1965 | 1 | |||
| Christiaan Olwagen | Adaptation, Director | 2015 - 2016 | 4 | |||
| Helga Orosz | Actor | 2005 | 2 | |||
| Minoru Ohhinata | Actor | 2002 | 1 | |||
| Kazuhiko Okazaki | Actor | 2002 | 1 | |||
| Adam O'Byrne | Actor | 2002 | 1 | |||
| Jed Orlemann | Actor | 2002 | 4 | |||
| Richard Olmsted | Designer, Lighting Designer | 2002 - 2003 | 3 | |||
| Jehuda Otte | Actor | 2002 | 1 | |||
| Tim Ocel | Director | 2002 | 1 | |||
| Hermann Otto | Translator | 2002 | 1 | |||