| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Sava Ognjanov | Actor, Director | 1905 - 1928 | 8 | |||
| Leo Orlandini | Actor | 1892 - 1924 | 12 | |||
| Walter Orchowski | Actor | 1906 | 1 | |||
| Ole Onsøjen | Musical Director | 1906 | 1 | |||
| Clara Osmond | Actor | 1906 - 1907 | 3 | |||
| Pál Olasz | Actor | 1906 - 1908 | 4 | |||
| Bronisław Oranowski | Actor, Translator | 1907 - 1911 | 3 | |||
| Antonina Ogińska | Actor | 1908 - 1910 | 3 | |||
| Barry O'Neil | Director | 1909 | 1 | |||
| Saburonosuke Okada | Designer | 1909 | 1 | |||
| Zhivko Odzhakov | Actor | 1910 | 1 | |||
| Todor Obreschkov | Actor | 1910 | 1 | |||
| Jurija Odzhakova | Actor | 1910 | 1 | |||
| Franciszka Ostrowska | Actor | 1910 | 2 | |||
| Bodil Ousdal | Choreographer | 1985 - 1991 | 6 | |||
| Dag Eirik Orbakk | Actor | 1985 | 2 | |||
| Knut Opperud | Designer | 1994 | 1 | |||
| Ragnar Olason | Actor | 1956 - 1973 | 48 | |||
| Elin Osjord | Actor | 1991 | 1 | |||
| Rigmor Ottesen | Actor | 1992 - 2007 | 32 | |||
| Marit Pedersen Omland | Actor | 1993 | 6 | |||
| Dean O'Neill | Actor | 1993 | 1 | |||
| Lorraine O'Keeffe | Actor | 1993 | 1 | |||
| Gunhild Mathea Olaussen | Actor | 1994 - 2000 | 14 | |||
| Mikkel Are Olsen | Actor | 1995 - 2007 | 3 | |||
| Kristin Aafløy Opdan | Actor | 1996 - 2013 | 2 | |||
| Tone Omland | Actor | 1996 - 2013 | 2 | |||
| Johan Osuldsen | Choreographer | 1998 - 2000 | 3 | |||
| Maren K. Onsaker | Actor | 1998 | 2 | |||
| Anders Schanche Olsen | Actor | 1998 | 1 | |||
| Linn Olsen | Actor | 1999 - 2000 | 7 | |||
| Vidar Olaussen | Actor | 1999 - 2006 | 11 | |||
| Svein Olstad | Actor | 1999 - 2013 | 14 | |||
| Karina Opdal | Actor | 2000 | 2 | |||
| Even Olstad | Actor | 2000 - 2016 | 25 | |||
| Lillian Olsen | Costume Designer | 2000 | 7 | |||
| Marie Ormset | Actor | 2002 | 3 | |||
| Elise Brunstad Odden | Actor | 2002 | 2 | |||
| Sverre Offord | Actor | 2002 | 2 | |||
| Simen M. Otnes | Actor | 2003 | 1 | |||
| Kristina Opsahl | Actor | 2004 - 2006 | 6 | |||
| Peder Opstad | Actor, Adaptation, Director, Producer | 2005 - 2010 | 183 | |||