| Name | Functions | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Ola Otnes | Actor | 1981 – 2020 | 256 | 2 | ||
| Penny Orloff | Actor | 1982 | 1 | |||
| Francisco Olmo | Actor | 1982 | 2 | |||
| Heinrich Ortmayr | Actor | 1982 | 1 | |||
| Peter O'Brien | Musician | 1982 | 1 | |||
| Robert O'Mahoney | Actor, Author | 1982 – 1991 | 10 | |||
| Sonja Oppenhagen | Actor | 1982 – 1993 | 4 | |||
| Jolanta Orzechowska | Actor | 1983 | 1 | |||
| Thomas Otto | Actor | 1983 | 12 | |||
| Charlie Otte | Actor | 1983 | 5 | |||
| John O'Reilly | Actor | 1983 | 3 | |||
| Nicholas Opolski | Actor | 1983 | 1 | |||
| Magda Olgyai | Actor | 1983 | 1 | |||
| Taisto-Bertil Orsmaa | Adaptation, Director | 1983 | 3 | |||
| Robert Olbrück | Actor | 1983 | 1 | |||
| Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 | 15 | |||
| Smaragda Olteanu | Actor | 1983 | 1 | |||
| Mark Owen-Taylor | Actor | 1983 | 1 | |||
| Sverre Anker Ousdal | Actor | 1983 – 2003 | 40 | |||
| Arvid Ones | Actor, Director | 1983 – 2004 | 22 | |||
| Matthias Oelrich | Actor | 1983 – 2006 | 3 | |||
| Richard Ooms | Actor | 1983 – 2008 | 10 | |||
| Henning Olesen | Actor | 1983 – 2010 | 3 | |||
| Francoise Oriane | Actor | 1984 | 1 | |||
| Danuše Ondráčková | Actor | 1984 | 2 | |||
| Matthew O'Sullivan | Actor | 1984 | 1 | |||
| Alexej Okuněv | Actor | 1984 | 1 | |||
| Judith Olauson | Actor | 1984 | 1 | |||
| Michael O'Flaherty | Musical Director | 1984 | 1 | |||
| Denis O'Hare | Actor | 1984 | 1 | |||
| Jan-Erik Ohlson | Actor | 1984 | 1 | |||
| Hidemi Ohsaka | Actor | 1984 | 1 | |||
| Christopher Oden | Actor, Director | 1984 – 2001 | 6 | |||
| Bodil Ousdal | Choreographer | 1985 | 6 | |||
| Dag Eirik Orbakk | Actor | 1985 | 2 | |||
| Rosmarie Oechslin | Actor | 1985 | 2 | |||
| Kirsti Otsamo | Actor | 1985 | 1 | |||
| Timo Ojala | Director | 1985 | 1 | |||
| Susanne Oechsner | Actor | 1985 | 3 | |||
| Aideen O'Kelly | Actor | 1985 | 1 | |||
| Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |||
| L'ubica Obuchová | Costume Designer | 1985 | 1 | |||