| Olson, Andrew | Andrew Olson | Actor | 2018 | 6 | |
| Oelkers, Uwe | Uwe Oelkers | Costume Designer, Designer | 1985 - 2010 | 7 | |
| Okornicki, Kazimierz | Kazimierz Okornicki | Actor, Director | 1908 - 1922 | 7 | |
| Oleś, Marcin | Marcin Oleś | Composer | 2006 - 2009 | 7 | |
| Olsten, Agnieszka | Agnieszka Olsten | Director | 2006 - 2009 | 7 | 1 |
| Ottbert, Otto | Otto Ottbert | Actor, Director | 1876 - 1906 | 7 | |
| Otto, Alexander | Alexander Otto | Actor, Designer | 1919 - 1966 | 7 | |
| Oleś, Bartłomiej Brat | Bartłomiej Brat Oleś | Composer | 2006 - 2009 | 7 | |
| Outram, Leonard | Leonard Outram | Actor, Director | 1891 - 1897 | 7 | 1 |
| Osmarr, Lili | Lili Osmarr | Actor | 1911 - 1926 | 7 | |
| Otto, Martina | Martina Otto | Actor | 1915 - 1925 | 7 | |
| Ottersen, Anne Marie | Anne Marie Ottersen | Actor | 1978 - 2014 | 7 | 1 |
| Olsen, Linn | Linn Olsen | Actor | 1999 - 2000 | 7 | |
| Olsen, Lillian | Lillian Olsen | Costume Designer | 2000 | 7 | |
| Orson, Barbara | Barbara Orson | Actor | 1968 - 1998 | 7 | |
| O'Connor, Cecile | Cecile O'Connor | Actor | 1973 | 7 | |
| Oikonomidou, Rania | Rania Oikonomidou | Actor | 1976 - 2004 | 7 | |
| O'Brien, Shelley | Shelley O'Brien | Actor | 2005 | 7 | |
| O'Brien, Raymond | Raymond O'Brien | Actor | 1935 - 1937 | 7 | |
| O'Brien, Eileen | Eileen O'Brien | Actor | 2000 | 8 | 1 |
| Orban, Peter | Peter Orban | Lighting Designer | 2011 | 8 | |
| Ohlsson, Erik | Erik Ohlsson | Actor | 1878 - 1883 | 8 | |
| Ottmay, Georg | Georg Ottmay | Actor | 1906 - 1961 | 8 | |
| Ozory, Armand | Armand Ozory | Actor | 1925 - 1952 | 8 | |
| Ognjanov, Sava | Sava Ognjanov | Actor, Director | 1905 - 1928 | 8 | |
| Ohlsson, Monica | Monica Ohlsson | Dramaturg, Translator | 2005 - 2009 | 8 | 1 |
| Olausson, Hilde | Hilde Olausson | Actor, Musician | 1985 - 2015 | 8 | 3 |
| Oschlag, Jakob | Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | 1 |
| Osborne, John | John Osborne | Adaptation, Translator | 1972 - 2011 | 8 | 1 |
| Ostendorf, Josef | Josef Ostendorf | Actor | 1991 - 2016 | 8 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| Olier, Luz | Luz Olier | Actor | 2016 | 8 | |
| Ojamaa, Pekka | Pekka Ojamaa | Costume Designer, Designer | 1990 - 2001 | 9 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1904 - 1916 | 9 | |
| Ottesen, Helle | Helle Ottesen | Actor | 1975 - 2021 | 9 | 1 |
| Oppel, Georg | Georg Oppel | Actor | 1893 - 1926 | 9 | |
| Ottmann, Victor | Victor Ottmann | Translator | 1901 - 1902 | 9 | 2 |
| Onno, Ferdinand | Ferdinand Onno | Actor | 1904 - 1938 | 9 | |
| O’Brien, Fergus | Fergus O’Brien | Sound Designer | 2006 | 9 | |
| Ott, Gisa | Gisa Ott | Actor | 1910 - 1941 | 9 | |
| Ortiz, Esperanza | Esperanza Ortiz | Actor | 1928 - 1929 | 9 | |
| Oliver, Stephen | Stephen Oliver | Composer | 1977 - 1983 | 9 | |
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