| Olesen, Henning | Henning Olesen | Actor | 1983 - 2010 | 3 | |
| Ousdal, Sverre Anker | Sverre Anker Ousdal (Sverre Anker Ousdal) | Actor | 1983 - 2020 | 40 | |
| Oriane, Francoise | Francoise Oriane (Francoise Oriane) | Actor | 1984 | 1 | |
| Ondráčková, Danuše | Danuše Ondráčková | Actor | 1984 | 2 | |
| O'Sullivan, Matthew | Matthew O'Sullivan | Actor | 1984 | 1 | |
| Okuněv, Alexej | Alexej Okuněv | Actor | 1984 | 1 | |
| Olauson, Judith | Judith Olauson | Actor | 1984 | 1 | |
| O'Flaherty, Michael | Michael O'Flaherty | Musical Director | 1984 | 1 | |
| O'Hare, Denis | Denis O'Hare | Actor | 1984 | 1 | |
| Ohlson, Jan-Erik | Jan-Erik Ohlson | Actor | 1984 | 1 | |
| Ohsaka, Hidemi | Hidemi Ohsaka | Actor | 1984 | 1 | |
| Otton, Steve | Steve Otton | Assistant Director | 1984 | 1 | |
| Oden, Christopher | Christopher Oden | Actor, Director | 1984 - 2001 | 6 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk (Dag Eirik Orbakk) | Actor | 1985 | 2 | |
| Oechslin, Rosmarie | Rosmarie Oechslin | Actor | 1985 | 2 | |
| Otsamo, Kirsti | Kirsti Otsamo | Actor | 1985 | 1 | |
| Ojala, Timo | Timo Ojala | Director | 1985 | 1 | |
| Oechsner, Susanne | Susanne Oechsner | Actor | 1985 | 3 | |
| O'Kelly, Aideen | Aideen O'Kelly | Actor | 1985 | 1 | |
| O´Driscoll, Ann | Ann O´Driscoll | Director, Lighting Designer | 1985 | 2 | |
| Obuchová, L'ubica | L'ubica Obuchová | Costume Designer | 1985 | 1 | |
| Overdijk, Mariken | Mariken Overdijk | Actor | 1985 | 1 | |
| Oskam, Peter | Peter Oskam | Costume Designer, Designer | 1985 | 2 | |
| O'Hara, John, Ryker | John Ryker O'Hara | Actor | 1985 | 2 | |
| O'Flanagan, Lucille | Lucille O'Flanagan | Actor | 1985 | 1 | |
| Oniga, Laurian | Laurian Oniga | Designer | 1985 | 3 | |
| Ona, Bjørn | Bjørn Ona | Actor | 1985 | 1 | |
| Olsen, Trygve | Trygve Olsen | Lighting Designer | 1985 - 1987 | 3 | |
| Ousdal, Bodil | Bodil Ousdal (Bodil Ousdal) | Choreographer | 1985 - 1991 | 6 | |
| Oelkers, Uwe | Uwe Oelkers (Uwe Oelkers) | Costume Designer, Designer | 1985 - 2010 | 7 | |
| Olausson, Hilde | Hilde Olausson (Hilde Olausson) | Actor, Musician | 1985 - 2015 | 8 | 2 |
| Oppliger, Hans | Hans Oppliger | Actor | 1986 | 1 | |
| Ogoun, Luboš | Luboš Ogoun | Choreographer | 1986 | 1 | |
| Olivero, Franco | Franco Olivero | Actor | 1986 | 2 | |
| Opffer, Yvonne | Yvonne Opffer (Yvonne Opffer) | Actor | 1987 | 1 | |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| O´Donnell, Sarah | Sarah O´Donnell | Actor | 1987 | 2 | |
| Oliveri, Josephyne | Josephyne Oliveri | Actor | 1987 | 2 | |
| Oldeide, Aina | Aina Oldeide | Actor | 1987 | 1 | |
| Okkerse, Nico | Nico Okkerse | Actor | 1987 | 1 | |
| Olcay, Emin | Emin Olcay (Emin Olcay) | Actor | 1987 | 1 | |
| Otxoa, Iñaki | Iñaki Otxoa | Actor | 1987 | 1 | |
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