| Ottesen, Rasmus | Rasmus Ottesen | Actor | 1902 - 1926 | 18 | |
| Oenslager, Donald | Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 |
| Occhini, Ilaria | Ilaria Occhini | Actor | 1981 - 2005 | 19 | 1 |
| Odasso, Cristina | Cristina Odasso | Actor | 2005 - 2006 | 19 | |
| Olsen, Arne, Thomas | Arne Thomas Olsen | Actor, Director | 1955 - 1963 | 19 | 1 |
| Olsson, Bror | Bror Olsson | Actor | 1877 - 1928 | 20 | 1 |
| Otto, Alex | Alex Otto | Actor, Director, Playwright | 1898 - 1934 | 21 | |
| Ousdal, Mads | Mads Ousdal | Actor | 1993 - 2020 | 21 | 4 |
| Ones, Arvid | Arvid Ones | Actor, Director | 1983 - 2004 | 22 | 1 |
| Osmarr, Otto | Otto Osmarr | Actor, Director | 1889 - 1919 | 23 | |
| O'Neil, Nance | Nance O'Neil | Actor | 1900 - 1917 | 23 | 1 |
| Olstad, Even | Even Olstad | Actor | 2000 - 2016 | 25 | |
| Olsen, Tyler | Tyler Olsen | Actor | 2006 | 25 | |
| Orloff, Ida | Ida Orloff | Actor | 1905 - 1942 | 26 | |
| Orvelius, Gunilla | Gunilla Orvelius | Actor | 1992 - 2002 | 27 | 1 |
| Oredsson, Thomas | Thomas Oredsson | Actor | 1975 - 1997 | 27 | |
| Otten, Marcel | Marcel Otten | Translator | 2012 - 2013 | 29 | 1 |
| Osterop, Marcel | Marcel Osterop | Actor | 2012 - 2013 | 29 | |
| Onslow, Michael | Michael Onslow | Actor | 1999 | 30 | |
| Ottesen, Rigmor | Rigmor Ottesen | Actor | 1992 - 2007 | 32 | |
| Ottesen, Per | Per Ottesen | Actor | 1992 - 2013 | 36 | 1 |
| Ofsdal, Steinar | Steinar Ofsdal | Musician | 1978 | 38 | 1 |
| Orsini, Umberto | Umberto Orsini | Actor | 1963 - 2020 | 39 | |
| Ousdal, Sverre Anker | Sverre Anker Ousdal | Actor | 1983 - 2020 | 40 | 1 |
| Ochandiano, Amelia | Amelia Ochandiano | Director | 2010 - 2011 | 40 | |
| Ormerod, Ben | Ben Ormerod | Lighting Designer | 1994 - 2007 | 41 | |
| Olsen, Olaus | Olaus Olsen | Actor | 1884 - 1904 | 45 | 2 |
| Olason, Ragnar | Ragnar Olason | Actor | 1956 - 1973 | 48 | |
| Oelschlegel, Vera | Vera Oelschlegel | Director | 1997 - 2000 | 52 | |
| Ostendorf, Nils | Nils Ostendorf | Composer | 2008 - 2014 | 54 | 1 |
| Otto, Harald | Harald Otto | Actor, Director | 1896 - 1922 | 55 | 1 |
| Olsen, Ragnar | Ragnar Olsen | Adaptation, Translator | 1994 - 2018 | 58 | 1 |
| Olofson, Anna | Anna Olofson | Mask Maker | 2006 - 2010 | 58 | |
| Onstad, Kari | Kari Onstad | Actor | 1976 - 2018 | 60 | 6 |
| Orcier, Cendrine | Cendrine Orcier | Actor | 2004 - 2005 | 63 | |
| Opsann, Aksel | Aksel Opsann | Actor | 1900 - 1928 | 66 | |
| Oggenfuss, Michael | Michael Oggenfuss | Designer, Lighting Designer | 2002 - 2004 | 66 | 1 |
| Ording, Jørn | Jørn Ording | Actor, Director | 1938 - 1978 | 69 | 1 |
| Orcier, Fabien | Fabien Orcier | Actor | 2004 - 2005 | 72 | |
| Osinski, Aurélien | Aurélien Osinski | Actor | 2000 - 2004 | 78 | |
| Overbeeke, Adri | Adri Overbeeke | Actor | 1991 - 1992 | 84 | |
| Opstad, Cathrine Gåre | Cathrine Gåre Opstad | Costume Designer | 2005 - 2008 | 90 | |
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