| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Kristoffer Olsen | Actor | 2024 | 1 | |||
| Paolo Orlandelli | Assistant Director | 2019 | 1 | |||
| Tamaki Okawa (Ōkawa Tamaki / 大川珠季) | Dramaturg, Translator | 2024 | 2 | |||
| Giulio Oppi | Actor | 1948 - 1949 | 2 | |||
| Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 | ||
| Nicholas Orloff | Actor | 1908 | 1 | 1 | ||
| Inga Olsen | Actor | 1877 - 1908 | 101 | 1 | ||
| Cornelia Oberkogler | Actor | 1959 | 1 | 1 | ||
| August Oddvar | Actor | 1900 - 1954 | 108 | 1 | ||
| Marcus Off | Actor | 2002 | 1 | 1 | ||
| Alexander Okun | Designer | 1992 - 2003 | 3 | 1 | ||
| César Olivar | Costume Designer | 2004 | 1 | 1 | ||
| Gunnar Ollén | Adaptation | 1947 - 2005 | 2 | 1 | ||
| Lennart Olsson | Director | 1971 - 1987 | 4 | 1 | ||
| Agnieszka Olsten | Director | 2006 - 2009 | 7 | 1 | ||
| Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | 1 | ||
| Sarah Orenstein | Actor | 2004 | 1 | 1 | ||
| Gudrun Orsky | Director | 2004 | 1 | 1 | ||
| Sharon Ott | Director | 1993 - 1997 | 3 | 1 | ||
| Helle Ottesen | Actor | 1975 - 2021 | 9 | 1 | ||
| Harald Otto | Actor, Director | 1896 - 1922 | 55 | 1 | ||
| Miranda Otto | Actor | 2002 - 2015 | 2 | 1 | ||
| Régis Outin | Actor | 1928 - 1978 | 4 | 1 | ||
| Kellie Overbey | Actor | 1998 | 1 | 1 | ||
| Eileen O'Brien | Actor | 2000 | 8 | 1 | ||
| Nils Ole Oftebro | Actor | 1970 - 2018 | 92 | 1 | ||
| Jørn Ording | Actor, Director | 1938 - 1978 | 69 | 1 | ||
| Tytti Oittinen | Director | 1992 - 1994 | 2 | 1 | ||
| Sverre Anker Ousdal | Actor | 1983 - 2020 | 40 | 1 | ||
| Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | 1 | ||
| Peter O'Brien | Actor | 2002 | 1 | 1 | ||
| Johann Adam Oest | Actor | 1977 - 2004 | 4 | 1 | ||
| Yoni Oppenheim | Director, Producer | 2011 | 2 | 1 | ||
| Mahin Oskui | Actor, Director | 1959 | 2 | 1 | ||
| Michael Oliver | Actor | 2011 | 1 | 1 | ||
| Bror Olsson | Actor | 1877 - 1928 | 20 | 1 | ||
| Hans Orlamundt | Actor | 1877 - 1880 | 13 | 1 | ||
| Vilhelm Olin | Actor, Director | 1886 - 1919 | 4 | 1 | ||
| Leonard Outram | Actor, Director | 1891 - 1897 | 7 | 1 | ||
| Olive Oliver | Actor | 1894 - 1904 | 2 | 1 | ||
| Hans Olden | Actor | 1895 | 1 | 1 | ||
| Nils Ostendorf | Composer | 2008 - 2014 | 54 | 1 | ||