| Olsen, Karl Gustav | Karl Gustav Olsen | Actor | 1933 | 1 | |
| Oden, Christopher | Christopher Oden | Actor, Director | 1984 - 2001 | 6 | |
| Osvald, Aksel | Aksel Osvald | Actor | 1933 - 1935 | 3 | |
| Owen, Jenny | Jenny Owen | Actor | 2013 | 1 | |
| O'Hara, Caitlin | Caitlin O'Hara | Designer | 2013 | 1 | |
| Onwumere, Toby | Toby Onwumere | Actor | 2014 | 1 | |
| Olsen, Roar, Skau | Roar Skau Olsen | Sound Designer | 2013 | 1 | |
| Oppliger, Hans | Hans Oppliger | Actor | 1986 | 1 | |
| 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 | |
| Oftedahl, Peter | Peter Oftedahl | Actor | 1970 | 1 | |
| 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 | |
| Olsen , Trygve | Trygve Olsen | Lighting Designer | 1985 - 1987 | 3 | |
| O'Flanagan, Lucille | Lucille O'Flanagan | Actor | 1985 | 1 | |
| O'Toole , John | John O'Toole | Actor | 1987 - 2000 | 2 | |
| Okajima, Yuki | Yuki Okajima | Lighting Designer | 2014 | 1 | |
| O'Hare, Denis | Denis O'Hare | Actor | 1984 | 1 | |
| Ogoun, Luboš | Luboš Ogoun | Choreographer | 1986 | 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 | |
| Olsen, Nils Bernt | Nils Bernt Olsen | Actor | 1987 - 1989 | 6 | |
| Oldeide, Aina | Aina Oldeide | Actor | 1987 | 1 | |
| Ornbo, Robert | Robert Ornbo | Lighting Designer | 1978 - 1987 | 2 | |
| Orczy, Odette | Odette Orczy | Actor | 1931 | 1 | |
| Oleniacz, Tom | Tom Oleniacz | Actor | 1990 | 1 | |
| O'Brien, Jack | Jack O'Brien | Director | 1990 | 1 | |
| Oakenleaf, Fingal | Fingal Oakenleaf | Actor | 2008 | 1 | |
| Oaten, James | James Oaten | Actor | 2008 | 1 | |
| O'Keefe, Nathan | Nathan O'Keefe | Actor | 2008 - 2017 | 3 | |
| O'Reilly, Imelda | Imelda O'Reilly | Actor | 1990 | 1 | |
| Ohlson, Jan-Erik | Jan-Erik Ohlson | Actor | 1984 | 1 | |
| Okkerse , Nico | Nico Okkerse | Actor | 1987 | 1 | |
| Otto, Eva | Eva Otto | Actor | 1991 | 2 | |
| Ohl, Jürgen | Jürgen Ohl | Actor | 1988 | 1 | |
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