| O'Malley, Geraldine | Geraldine O'Malley | Costume Designer, Designer | 1989 - 1990 | 4 | |
| Oliveira, Christian Manuel | Christian Manuel Oliveira | Actor | 2006 - 2007 | 4 | |
| Otto, Frank-Tilmann | Frank-Tilmann Otto | Costume Designer, Designer | 2008 | 4 | |
| Otto, Max Julian | Max Julian Otto | Designer | 2008 - 2009 | 4 | |
| O’Hearn, Nigel | Nigel O’Hearn | Adaptation | 2011 - 2016 | 4 | |
| Osa, Sigbjørn, Bernhoft | Sigbjørn Bernhoft Osa | Actor | 1962 - 1965 | 4 | |
| Onsum, Per | Per Onsum | Actor | 1962 - 1965 | 4 | |
| Oberlin, Richard | Richard Oberlin | Actor | 1961 - 1963 | 4 | |
| O'Rourke, Joan | Joan O'Rourke | Actor, Costume Designer | 1945 - 1961 | 4 | |
| Orlikowsky, Wazlaw | Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 - 1964 | 4 | 1 |
| Ophaug, Erna | Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |
| Omdal, Leif | Leif Omdal | Actor | 1935 - 1956 | 4 | |
| Okito, Takashi | Takashi Okito | Actor | 2016 - 2018 | 4 | |
| O'Malley, Tom | Tom O'Malley | Actor | 1949 | 4 | |
| Ohlin, Bjarne | Bjarne Ohlin | Actor | 1971 | 4 | |
| Okazaki, Satsuki | Satsuki Okazaki | Actor | 2017 | 4 | |
| Oliveira, João, Ricardo Barros | João Ricardo Barros Oliveira | Musical Director, Sound Designer | 2002 - 2021 | 4 | |
| Osazuwa, Evelyn, Rasmussen | Evelyn Rasmussen Osazuwa | Actor, Composer | 2018 - 2019 | 4 | |
| O'Riordan, Rachel | Rachel O'Riordan | Director | 2015 - 2025 | 4 | |
| Orme, Michael | Michael Orme | Director, Producer | 1930 - 1936 | 5 | |
| Oscar, Henry | Henry Oscar | Actor, Director, Producer | 1930 - 1947 | 5 | |
| Otto, Wilhelm | Wilhelm Otto | Actor | 1889 - 1898 | 5 | |
| Olsen, Frk. | Frk. Olsen | Actor | 1874 - 1876 | 5 | |
| Ozoliņš, Pēteris | Pēteris Ozoliņš | Actor, Director | 1889 - 1912 | 5 | |
| Odemar, Fritz | Fritz Odemar | Actor, Director | 1893 - 1934 | 5 | |
| Ostwald, Frank | Frank Ostwald | Actor | 1917 - 1937 | 5 | |
| Oland, Warner | Warner Oland | Actor | 1906 - 1908 | 5 | 1 |
| Oftebro, Jakob | Jakob Oftebro | Actor | 2006 - 2022 | 5 | 1 |
| Olsen, Tonny | Tonny Olsen | Actor | 1918 - 1924 | 5 | |
| Orlandini, Lia | Lia Orlandini | Actor | 1921 - 1922 | 5 | |
| Olsen, Arne, H. | Arne H. Olsen | Lighting Designer | 1971 - 1978 | 5 | |
| Omodei, Raymond | Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |
| Oudinotis, Alekos | Alekos Oudinotis | Actor | 1975 - 1985 | 5 | |
| Olschok, Herbert | Herbert Olschok | Director | 1988 - 2014 | 5 | |
| Orthofer, Monika | Monika Orthofer | Actor | 1981 | 5 | |
| Osis, Jānis | Jānis Osis | Actor, Director | 1921 - 1943 | 5 | |
| Otte, Charlie | Charlie Otte | Actor | 1983 | 5 | |
| Osca, Isabel | Isabel Osca | Actor | 2001 | 5 | |
| Owe, Baard | Baard Owe | Actor | 1964 - 2007 | 5 | |
| O´Regan, Mark | Mark O´Regan | Actor | 1988 | 5 | |
| Orav, Aksel | Aksel Orav | Actor | 1962 - 1997 | 5 | |
| Olsén, Ruth | Ruth Olsén | Actor | 1995 | 5 | |
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