| Ousdal, Bodil | Bodil Ousdal | Choreographer | 1985 - 1991 | 6 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk | Actor | 1985 | 2 | |
| Opperud, Knut | Knut Opperud | Designer | 1994 | 1 | |
| Olason, Ragnar | Ragnar Olason | Actor | 1956 - 1973 | 48 | |
| Osjord, Elin | Elin Osjord | Actor | 1991 | 1 | |
| Ottesen, Rigmor | Rigmor Ottesen | Actor | 1992 - 2007 | 32 | |
| Ottesen, Per | Per Ottesen | Actor | 1992 - 2013 | 36 | |
| Omland, Marit Pedersen | Marit Pedersen Omland | Actor | 1993 | 6 | |
| Ones, Arvid | Arvid Ones | Actor, Director | 1983 - 2004 | 22 | |
| O'Neill, Dean | Dean O'Neill | Actor | 1993 | 1 | |
| O'Keeffe, Lorraine | Lorraine O'Keeffe | Actor | 1993 | 1 | |
| Olaussen, Gunhild Mathea | Gunhild Mathea Olaussen | Actor | 1994 - 2000 | 14 | |
| Olsen, Ragnar | Ragnar Olsen | Adaptation, Translator | 1994 - 2015 | 48 | |
| Ottersen, Anne Marie | Anne Marie Ottersen | Actor | 1978 - 2014 | 7 | |
| Olsen, Mikkel Are | Mikkel Are Olsen | Actor | 1995 - 2007 | 3 | |
| Opdan, Kristin Aafløy | Kristin Aafløy Opdan | Actor | 1996 - 2013 | 2 | |
| Omland, Tone | Tone Omland | Actor | 1996 - 2013 | 2 | |
| Osuldsen, Johan | Johan Osuldsen | Choreographer | 1998 - 2000 | 3 | |
| Onsaker, Maren K. | Maren K. Onsaker | Actor | 1998 | 2 | |
| Olsen, Anders Schanche | Anders Schanche Olsen | Actor | 1998 | 1 | |
| Olsen, Linn | Linn Olsen | Actor | 1999 - 2000 | 7 | |
| Olaussen, Vidar | Vidar Olaussen | Actor | 1999 - 2006 | 11 | |
| Olstad, Svein | Svein Olstad | Actor | 1999 - 2013 | 14 | |
| Opdal, Karina | Karina Opdal | Actor | 2000 | 2 | |
| Olstad, Even | Even Olstad | Actor | 2000 - 2016 | 25 | |
| Olsen, Lillian | Lillian Olsen | Costume Designer | 2000 | 7 | |
| Ormset, Marie | Marie Ormset | Actor | 2002 | 3 | |
| Odden, Elise Brunstad | Elise Brunstad Odden | Actor | 2002 | 2 | |
| Offord, Sverre | Sverre Offord | Actor | 2002 | 2 | |
| Offord, Hilde Svennevig | Hilde Svennevig Offord | Actor | 2002 - 2007 | 3 | |
| Opsahl, Linda | Linda Opsahl | Actor | 2002 | 2 | |
| Otnes, Simen M. | Simen M. Otnes | Actor | 2003 | 1 | |
| Opsahl, Kristina | Kristina Opsahl | Actor | 2004 - 2006 | 6 | |
| Ohlsson, Monica | Monica Ohlsson | Dramaturg, Translator | 2005 - 2009 | 8 | |
| Opstad, Peder | Peder Opstad | Actor, Adaptation, Director, Producer | 2005 - 2010 | 183 | |
| Opstad, Cathrine Gåre | Cathrine Gåre Opstad | Costume Designer | 2005 - 2008 | 90 | |
| Olsen, Lars Reynert | Lars Reynert Olsen | Actor | 2005 - 2008 | 90 | |
| Obuchowicz, Bartek Kaminski | Bartek Kaminski Obuchowicz | Actor | 2005 | 1 | |
| Otterstedt, Lars | Lars Otterstedt | Actor | 2006 | 11 | |
| Oltedal, Martin Johannes | Martin Johannes Oltedal | Actor | 2006 | 1 | |
| Oldani, Emilia | Emilia Oldani | Actor | 2006 | 2 | |
| Olsen, Julia Stefany | Julia Stefany Olsen | Actor | 2006 | 1 | |
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