| Ovanessian, Arby | Arby Ovanessian | Costume Designer, Designer, Director | 1970 | 3 | 1 |
| Ole, Antonio | Antonio Ole | | | | 1 |
| Ohlson, Monica | Monica Ohlson | | | | 1 |
| Olsen, Ole | Ole Olsen | Actor, Composer | 1895 - 1922 | 18 | 2 |
| Orak, Aydin | Aydin Orak | Actor, Translator | 2010 | 16 | 2 |
| Olsen, Olaus | Olaus Olsen | Actor | 1884 - 1904 | 45 | 2 |
| Ottmann, Victor | Victor Ottmann | Translator | 1901 - 1902 | 9 | 2 |
| Olesen, Kirsten | Kirsten Olesen | Actor | 1978 - 2011 | 12 | 2 |
| O'Connor, Peter, Dylan | Peter Dylan O'Connor | Actor | 2013 | 1 | 2 |
| Ost, Kathrin | Kathrin Ost | Actor | 2010 - 2011 | 12 | 2 |
| Oechel, Hagen | Hagen Oechel | Actor | 2012 - 2015 | 2 | 2 |
| O'Reilly, Genevieve | Genevieve O'Reilly | Actor | 2011 | 1 | 2 |
| Ottesen, Marian Saastad | Marian Saastad Ottesen | Actor | 2006 - 2021 | 11 | 3 |
| Otnes, Ola | Ola Otnes | Actor | 1981 - 2020 | 128 | 3 |
| Osa, Liv Bernhoft | Liv Bernhoft Osa | Actor | 1993 - 2020 | 10 | 3 |
| Olausson, Hilde | Hilde Olausson | Actor, Musician | 1985 - 2015 | 8 | 3 |
| Olsson, Tove | Tove Olsson | Actor | 2008 | 10 | 3 |
| O'Donnell, Patrick | Patrick O'Donnell | Actor | 2012 | 1 | 3 |
| OʼRegan, Craig | Craig OʼRegan | | | | 3 |
| Ousdal, Mads | Mads Ousdal | Actor | 1993 - 2020 | 21 | 4 |
| Olivette, Marcia, Ossei Agyeman | Marcia Ossei Agyeman Olivette | Actor | 2006 | 1 | 4 |
| Ordeman, Lee | Lee Ordeman | Actor | 2012 | 1 | 4 |
| Obst, Lena | Lena Obst | | | | 5 |
| Onstad, Kari | Kari Onstad | Actor | 1976 - 2018 | 60 | 6 |
| Owenberg-Lyche, Ragnhild | Ragnhild Owenberg-Lyche | Actor | 1911 - 1922 | 6 | 6 |
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