| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Aune Ollila | ||||||
| Hiroko Ohtaki | Actor | 2000 | 1 | |||
| Ann Oakley | Director | 2000 | 1 | |||
| Alev Oraloğlu | Actor | 2012 | 1 | |||
| Maria Olska | Actor | 1925 | 1 | |||
| Kinji Ohoka | Director, Translator | 1971 | 2 | |||
| Levente Orbán | Actor | 2016 | 2 | |||
| Eren Ozker | Actor | 1971 | 1 | |||
| Jill O'Hara | Actor | 1971 | 1 | |||
| Cachi Otero | Costume Designer | 1971 | 3 | |||
| Bjarne Ohlin | Actor | 1971 | 4 | |||
| Rositsa Ognyanova | Actor | 2015 - 2016 | 2 | |||
| Lesley O'Hara | Actor | 1972 | 1 | |||
| Cristian Oroșanu | Conductor | 2012 | 1 | |||
| George Owen | Actor | 1911 - 1912 | 5 | |||
| Stelian Olariu | Conductor | 2007 | 1 | |||
| Wilfried Ortmann | Actor | 1973 | 1 | |||
| Marlo Olson | Actor | 2017 | 1 | |||
| Matt Otto | Sound Designer | 2017 | 1 | |||
| Carl Oatley | Actor | 1975 | 1 | |||
| Coşkun Orhon | Actor | 1965 - 1971 | 2 | |||
| Burcu Oktav | Actor | 2017 | 1 | |||
| Rachel O'Riordan | Director | 2015 | 1 | |||
| Andrew Owens | Actor | 2017 | 1 | |||
| Bjørn Ona | Actor | 1985 | 1 | |||
| Terence O'Brien | Actor | 1917 | 1 | |||
| Eyvind Olsen | Musician | 1976 | 1 | |||
| Michiko Ohtsuka | Actor | 1978 | 1 | |||
| Kinji Obino | Actor | 1978 | 1 | |||
| Tetsushi Obino | Actor | 1978 | 1 | |||
| Yachiyo Ohtori | Actor | 1978 | 1 | |||
| Niclas Olson | Actor, Adaptation, Director | 2017 | 3 | |||
| Anne Oostveen | Actor | 1978 | 1 | |||
| John Olohan | Actor | 1980 | 16 | |||
| Máire O'Hanlon | Actor | 1980 | 16 | |||
| Grischa Ostrovski | Director | 1980 | 1 | |||
| Nancy Ortíz | Actor | 1980 | 1 | |||
| Norma-Norma Ortíz | Actor | 1980 | 1 | |||
| Tamara Osske | Actor | 1980 | 1 | |||
| Carol Oditz | Costume Designer | 1981 | 1 | |||
| Kate O'Mara | Actor | 1981 | 1 | |||
| Trisha O´Donnell | Lighting Designer | 1981 | 1 | |||