| Name | Functions | Event Dates  | Events | Resources | ||
|---|---|---|---|---|---|---|
| Michael O'Flaherty | Musical Director | 1984 | 1 | |||
| Denis O'Hare | Actor | 1984 | 1 | |||
| Jan-Erik Ohlson | Actor | 1984 | 1 | |||
| Hidemi Ohsaka | Actor | 1984 | 1 | |||
| Steve Otton | Assistant Director | 1984 | 1 | |||
| Sverre Anker Ousdal | Actor | 1983 - 2020 | 40 | |||
| Henning Olesen | Actor | 1983 - 2010 | 3 | |||
| Richard Ooms | Actor | 1983 - 2008 | 10 | |||
| Matthias Oelrich | Actor | 1983 - 2006 | 3 | |||
| Arvid Ones | Actor, Director | 1983 - 2004 | 22 | |||
| Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |||
| Taisto-Bertil Orsmaa | Adaptation, Director | 1983 - 1996 | 3 | |||
| Thomas Otto | Actor | 1983 - 1993 | 12 | |||
| Jolanta Orzechowska | Actor | 1983 | 1 | |||
| Charlie Otte | Actor | 1983 | 5 | |||
| John O'Reilly | Actor | 1983 | 3 | |||
| Nicholas Opolski | Actor | 1983 | 1 | |||
| Magda Olgyai | Actor | 1983 | 1 | |||
| Robert Olbrück | Actor | 1983 | 1 | |||
| Smaragda Olteanu | Actor | 1983 | 1 | |||
| Mark Owen-Taylor | Actor | 1983 | 1 | |||
| Sonja Oppenhagen | Actor | 1982 - 1993 | 4 | |||
| Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |||
| Penny Orloff | Actor | 1982 | 1 | |||
| Francisco Olmo | Actor | 1982 | 3 | |||
| Heinrich Ortmayr | Actor | 1982 | 1 | |||
| Peter O'Brien | Musician | 1982 | 1 | |||
| Ola Otnes | Actor | 1981 - 2020 | 128 | 2 | ||
| Ilaria Occhini | Actor | 1981 - 2005 | 19 | |||
| Joan Orenstein | Actor | 1981 - 1991 | 3 | |||
| Aage Olschansky | Actor | 1981 | 1 | |||
| Beatrice O'Donnell | Actor | 1981 | 1 | |||
| James O'Reilly | Actor | 1981 | 2 | |||
| Dietrich v. Oertzen | Actor, Dramaturg, Translator | 1981 | 3 | |||
| Monika Orthofer | Actor | 1981 | 5 | |||
| Sylvia O'Brien | Actor | 1981 | 1 | |||
| Shelly Olson | Actor | 1981 | 1 | |||
| Patricia O'Donnell | Actor | 1981 | 4 | |||
| Anna-Maija Ollikainen | Actor | 1981 | 1 | |||
| Carol Oditz | Costume Designer | 1981 | 1 | |||
| Kate O'Mara | Actor | 1981 | 1 | |||
| Trisha O´Donnell | Lighting Designer | 1981 | 1 | |||