| Onstad, Kari | Kari Onstad | Actor | 1976 - 2018 | 60 | 6 |
| Owenberg-Lyche, Ragnhild | Ragnhild Owenberg-Lyche | Actor | 1911 - 1922 | 6 | 6 |
| Obst, Lena | Lena Obst | | | | 5 |
| 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 |
| 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 |
| 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 |
| Oenslager, Donald | Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 |
| Orloff, Nicholas | Nicholas Orloff | Actor | 1908 | 1 | 1 |
| Olsen, Inga | Inga Olsen | Actor | 1877 - 1908 | 101 | 1 |
| Oberkogler, Cornelia | Cornelia Oberkogler | Actor | 1959 | 1 | 1 |
| Oddvar, August | August Oddvar | Actor | 1900 - 1954 | 108 | 1 |
| Off, Marcus | Marcus Off | Actor | 2002 | 1 | 1 |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Olivar, César | César Olivar | Costume Designer | 2004 | 1 | 1 |
| Ollén, Gunnar | Gunnar Ollén | Adaptation | 1947 - 2005 | 2 | 1 |
| Olsson, Lennart | Lennart Olsson | Director | 1971 - 1987 | 4 | 1 |
| Olsten, Agnieszka | Agnieszka Olsten | Director | 2006 - 2009 | 7 | 1 |
| Omdal, Odin Hørthe | Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | 1 |
| Orenstein, Sarah | Sarah Orenstein | Actor | 2004 | 1 | 1 |
| Orsky, Gudrun | Gudrun Orsky | Director | 2004 | 1 | 1 |
| Ott, Sharon | Sharon Ott | Director | 1993 - 1997 | 3 | 1 |
| Ottesen, Helle | Helle Ottesen | Actor | 1975 - 2021 | 9 | 1 |
| Otto, Harald | Harald Otto | Actor, Director | 1896 - 1922 | 55 | 1 |
| Otto, Miranda | Miranda Otto | Actor | 2002 - 2015 | 2 | 1 |
| Outin, Régis | Régis Outin | Actor | 1928 - 1978 | 4 | 1 |
| Overbey, Kellie | Kellie Overbey | Actor | 1998 | 1 | 1 |
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