| Oliveira, Joice | Joice Oliveira | Actor | 1945 | 1 | |
| O'Grady, Chris | Chris O'Grady | Actor | 2011 | 1 | |
| O'Grady, Sorcha | Sorcha O'Grady | Actor | 2011 | 1 | |
| O'Neill, Chris | Chris O'Neill | Designer, Lighting Designer | 2011 | 2 | |
| Ottenheimer, Albert M. | Albert M. Ottenheimer | Actor | 1932 - 1936 | 4 | |
| Oraker, Rutledge | Rutledge Oraker | Actor | 1932 | 2 | |
| Opsvig, Virginia | Virginia Opsvig | Costume Designer, Mask Maker | 1931 - 1936 | 4 | |
| O'Gara, Patrick | Patrick O'Gara | Actor | 1973 | 1 | |
| Ogawa, Toshiro | Toshiro Ogawa | Lighting Designer | 1964 - 1981 | 2 | |
| O'Leary, Bridget Kathleen | Bridget Kathleen O'Leary | Director | 2011 | 1 | |
| Osa, Life Bernhoft | Life Bernhoft Osa | Actor | 2010 | 1 | |
| Oddsson, Júlíus | Júlíus Oddsson | Actor | 1944 | 1 | |
| Orban, Peter | Peter Orban | Lighting Designer | 2011 | 8 | |
| Oppermann, Heinrich | Heinrich Oppermann | Actor | 1895 - 1925 | 13 | |
| Oster, Teresina | Teresina Oster | Actor | 1906 - 1909 | 4 | |
| Ormerod, Ben | Ben Ormerod | Lighting Designer | 1994 - 2007 | 41 | |
| O'Reilly, James | James O'Reilly | Actor | 1981 | 2 | |
| Olivetti, Alessia | Alessia Olivetti | Actor | 2008 - 2011 | 4 | |
| Olsen, Ole Andreas | Ole Andreas Olsen | Actor | 1859 | 1 | |
| Olsen, Frk. | Frk. Olsen | Actor | 1874 - 1876 | 5 | |
| Olbrich, Julius | Julius Olbrich | Actor | 1876 - 1910 | 16 | |
| Otto-Martineck, Rosa | Rosa Otto-Martineck | Actor | 1876 | 1 | |
| Olsson, Bror | Bror Olsson | Actor | 1877 - 1928 | 15 | |
| Olsen, - | - Olsen | Actor | 1883 | 1 | |
| Orlamundt, Hans | Hans Orlamundt | Actor | 1877 - 1880 | 13 | |
| Ottomeyer, Hans Leonard | Hans Leonard Ottomeyer | Actor | 1878 | 1 | |
| Ohlsson, Erik | Erik Ohlsson | Actor | 1878 - 1883 | 8 | |
| Otto, Herr | Herr Otto | Actor, Director | 1878 | 2 | |
| Oppmar, Mr. | Mr. Oppmar | Actor | 1879 | 1 | |
| Offel-Kley, Van | Van Offel-Kley | Actor | 1880 | 1 | |
| Offenbach, Jacques | Jacques Offenbach | Composer | 1880 | 1 | |
| Oberthür, Charles | Charles Oberthür | Composer | 1880 | 1 | |
| Ohlson, - | - Ohlson | Actor | 1882 | 1 | |
| Otremba, Adolf | Adolf Otremba | Translator | 1882 - 1883 | 3 | |
| Otrembowa, Julia | Julia Otrembowa | Actor, Translator | 1883 - 1899 | 4 | |
| Otterström, Ludvig | Ludvig Otterström | Actor | 1883 - 1885 | 9 | |
| Ottesen, Rasmus | Rasmus Ottesen | Actor | 1902 - 1926 | 18 | |
| Olsson, Mr. | Mr. Olsson | Actor | 1886 | 1 | |
| Olin, Vilhelm | Vilhelm Olin | Actor | 1886 - 1919 | 2 | |
| Olander, - | - Olander | Actor | 1887 | 1 | |
| Oeser, Anna | Anna Oeser | Actor | 1888 | 1 | |
| Ozoliņš, Pēteris | Pēteris Ozoliņš | Actor, Director | 1889 - 1912 | 5 | |
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