| 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 | |
| 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 | |
| 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 | |
| Orczy, Odette | Odette Orczy | Actor | 1931 | 1 | |
| Oleniacz, Tom | Tom Oleniacz | Actor | 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 | |
| Opitz, E. | E. Opitz | Actor | 1990 | 1 | |
| Obermüller, Ulrike | Ulrike Obermüller | Costume Designer | 1991 - 2016 | 2 | |
| Otis, James | James Otis | Actor | 1991 | 1 | |
| O'Brien, Doc | Doc O'Brien | Actor | 1991 | 6 | |
| Olsson, Ecke | Ecke Olsson | Actor | 1990 | 1 | |
| Onofri, Stefano | Stefano Onofri | Actor | 1991 | 1 | |
| Olson, Stephan | Stephan Olson | Designer | 1990 | 1 | |
| Otter, Karl | Karl Otter | Actor | 1990 | 1 | |
| Olschewski, Gerhard | Gerhard Olschewski | Actor | 1990 | 1 | |
| O´Byrne, Louis | Louis O´Byrne | Designer | 1991 | 1 | |
| Ohlsson, Lotta | Lotta Ohlsson | Actor | 1990 | 2 | |
| Oscarsson, Kjell | Kjell Oscarsson | Actor | 1990 | 2 | |
| Omundson, Timothy | Timothy Omundson | Actor | 1990 | 1 | |
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