| Ostrowska, Franciszka | Franciszka Ostrowska (Franciszka Ostrowska) | Actor | 1910 | 2 | |
| Olram, Gunnar | Gunnar Olram (Gunnar Olram) | Actor | 1943 - 2006 | 187 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk (Dag Eirik Orbakk) | Actor | 1985 | 2 | |
| Ottesen, Marian Saastad | Marian Saastad Ottesen (Marian Saastad Ottesen) | Actor | 2006 - 2021 | 11 | 2 |
| Otnes, Ola | Ola Otnes (Ola Otnes) | Actor | 1981 - 2020 | 128 | 2 |
| Onstad, Kari | Kari Onstad (Kari Onstad) | Actor | 1976 - 2018 | 60 | 5 |
| Olason, Ragnar | Ragnar Olason (Ragnar Olason) | Actor | 1956 - 1973 | 48 | |
| Osjord, Elin | Elin Osjord (Elin Osjord) | Actor | 1991 | 1 | |
| Ottesen, Rigmor | Rigmor Ottesen (Rigmor Ottesen) | Actor | 1992 - 2007 | 32 | |
| Ottesen, Per | Per Ottesen (Per Ottesen) | Actor | 1992 - 2013 | 36 | |
| Osa, Liv Bernhoft | Liv Bernhoft Osa (Liv Bernhoft Osa) | Actor | 1993 - 2020 | 9 | 2 |
| Omland, Marit Pedersen | Marit Pedersen Omland (Marit Pedersen Omland) | Actor | 1993 | 6 | |
| Ousdal, Mads | Mads Ousdal (Mads Ousdal) | Actor | 1993 - 2020 | 21 | 3 |
| O'Neill, Dean | Dean O'Neill (Dean O'Neill) | Actor | 1993 | 1 | |
| O'Keeffe, Lorraine | Lorraine O'Keeffe (Lorraine O'Keeffe) | Actor | 1993 | 1 | |
| Olaussen, Gunhild Mathea | Gunhild Mathea Olaussen (Gunhild Mathea Olaussen) | Actor | 1994 - 2000 | 14 | |
| Ottersen, Anne Marie | Anne Marie Ottersen (Anne Marie Ottersen) | Actor | 1978 - 2014 | 7 | |
| Olsen, Mikkel Are | Mikkel Are Olsen (Mikkel Are Olsen) | Actor | 1995 - 2007 | 3 | |
| Opdan, Kristin Aafløy | Kristin Aafløy Opdan (Kristin Aafløy Opdan) | Actor | 1996 - 2013 | 2 | |
| Omland, Tone | Tone Omland (Tone Omland) | Actor | 1996 - 2013 | 2 | |
| Onsaker, Maren K. | Maren K. Onsaker (Maren K. Onsaker) | Actor | 1998 | 2 | |
| Olsen, Anders Schanche | Anders Schanche Olsen (Anders Schanche Olsen) | Actor | 1998 | 1 | |
| Olsen, Linn | Linn Olsen (Linn Olsen) | Actor | 1999 - 2000 | 7 | |
| Olaussen, Vidar | Vidar Olaussen (Vidar Olaussen) | Actor | 1999 - 2006 | 11 | |
| Olstad, Svein | Svein Olstad (Svein Olstad) | Actor | 1999 - 2013 | 14 | |
| Opdal, Karina | Karina Opdal (Karina Opdal) | Actor | 2000 | 2 | |
| Olstad, Even | Even Olstad (Even Olstad) | Actor | 2000 - 2016 | 25 | |
| Ormset, Marie | Marie Ormset (Marie Ormset) | Actor | 2002 | 3 | |
| Odden, Elise Brunstad | Elise Brunstad Odden (Elise Brunstad Odden) | Actor | 2002 | 2 | |
| Offord, Sverre | Sverre Offord (Sverre Offord) | Actor | 2002 | 2 | |
| Offord, Hilde Svennevig | Hilde Svennevig Offord (Hilde Svennevig Offord) | Actor | 2002 - 2007 | 3 | |
| Opsahl, Linda | Linda Opsahl (Linda Opsahl) | Actor | 2002 | 2 | |
| Otnes, Simen M. | Simen M. Otnes (Simen M. Otnes) | Actor | 2003 | 1 | |
| Opsahl, Kristina | Kristina Opsahl (Kristina Opsahl) | Actor | 2004 - 2006 | 6 | |
| Olsen, Lars Reynert | Lars Reynert Olsen | Actor | 2005 - 2008 | 90 | |
| Obuchowicz, Bartek Kaminski | Bartek Kaminski Obuchowicz (Bartek Kaminski Obuchowicz) | Actor | 2005 | 1 | |
| Otterstedt, Lars | Lars Otterstedt (Lars Otterstedt) | Actor | 2006 | 11 | |
| Oltedal, Martin Johannes | Martin Johannes Oltedal (Martin Johannes Oltedal) | Actor | 2006 | 1 | |
| Oldani, Emilia | Emilia Oldani (Emilia Oldani) | Actor | 2006 | 2 | |
| Olsen, Julia Stefany | Julia Stefany Olsen (Julia Stefany Olsen) | Actor | 2006 | 1 | |
| Oftebro, Jakob | Jakob Oftebro (Jakob Oftebro) | Actor | 2006 - 2022 | 5 | |
| Olsen, Elisabeth | Elisabeth Olsen (Elisabeth Olsen) | Actor | 2006 | 1 | |
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