| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Yean Olsson | Actor, Costume Designer | 1997 | 4 | |||
| Nicholas Olsson | Actor | 1996 - 1997 | 2 | |||
| Tamae Ohnishi | Actor | 1995 | 1 | |||
| Karen Oberlin | Actor | 1995 | 1 | |||
| S. Orlac | Director | 1995 | 1 | |||
| Heidemarie Otte | Mask Maker | 2002 | 1 | |||
| Gianfranco Ombuen | Actor | 1967 - 1969 | 3 | |||
| Jiří Olijnyk | Actor | 1969 | 1 | |||
| Mathew O'Sullivan | Actor | 1969 | 1 | |||
| Gustav Opočenský | Actor | 1969 | 1 | |||
| Warwick Ongley | Director | 1969 | 1 | |||
| Edward Ożana | Actor | 1970 - 1975 | 2 | |||
| Vera Oelschlegel | Director | 1997 - 2000 | 52 | |||
| Rune Ottoson | Actor | 1969 | 1 | |||
| Stanislav Oubram | Actor | 1969 - 2006 | 2 | |||
| Mark O’Rowe | Adaptation, Director | 2015 - 2023 | 2 | |||
| Peter O’Brien | Costume Designer | 2015 | 1 | |||
| Syusaku Ohtake | Actor | 1997 | 1 | |||
| Sara Otermin | Actor | 1997 | 1 | |||
| Martin Olbertz | Actor | 1997 | 1 | |||
| Petra Ottl | Actor | 1997 | 1 | |||
| 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 | |||