| Oscàr, Martin | Martin Oscàr (Martin Oscàr) | Actor | 1914 | 1 | |
| Olsen, Hans | Hans Olsen (Hans Olsen) | Actor | 1902 - 1903 | 17 | |
| Orliński, Janusz | Janusz Orliński (Janusz Orliński) | Actor | 1903 - 1909 | 4 | |
| Ozoliņa, Marta | Marta Ozoliņa (Marta Ozoliņa) | Actor | 1903 | 1 | |
| Otis, Elita Proctor | Elita Proctor Otis (Elita Proctor Otis) | Actor | 1903 | 13 | |
| O'Neil, Nance | Nance O'Neil (Nance O'Neil) | Actor | 1900 - 1917 | 23 | |
| Ormbee, Helen | Helen Ormbee (Helen Ormbee) | Actor | 1904 | 1 | |
| Oaker, Jane | Jane Oaker (Jane Oaker) | Actor | 1904 | 1 | |
| O'Neill, Kathleen | Kathleen O'Neill (Kathleen O'Neill) | Actor | 1904 | 1 | |
| Ordonówna, Władysława | Władysława Ordonówna (Władysława Ordonówna) | Actor | 1904 | 1 | |
| Otis, Edith | Edith Otis (Edith Otis) | Actor | 1905 | 1 | |
| Ognjanov, Sava | Sava Ognjanov (Sava Ognjanov) | Actor, Director | 1905 - 1928 | 8 | |
| Ottolini, Piero | Piero Ottolini (Piero Ottolini) | Translator | 1905 - 1906 | 4 | |
| Orlandini, Leo | Leo Orlandini (Leo Orlandini) | Actor | 1892 - 1924 | 12 | |
| Orleneff, Paul | Paul Orleneff (Paul Orleneff) | Actor | 1906 - 1912 | 7 | |
| Olive, Edyth | Edyth Olive (Edyth Olive) | Actor | 1906 | 1 | |
| Orchowski, Walter | Walter Orchowski (Walter Orchowski) | Actor | 1906 | 1 | |
| Onsøjen, Ole | Ole Onsøjen (Ole Onsøjen) | Musical Director | 1906 | 1 | |
| Osmond, Clara | Clara Osmond (Clara Osmond) | Actor | 1906 - 1907 | 3 | |
| Olasz, Pál | Pál Olasz (Pál Olasz) | Actor | 1906 - 1908 | 4 | |
| Oranowski, Bronisław | Bronisław Oranowski (Bronisław Oranowski) | Actor, Translator | 1907 - 1911 | 3 | |
| Oland, Warner | Warner Oland (Warner Oland) | Actor | 1906 - 1908 | 5 | |
| Ogińska, Antonina | Antonina Ogińska (Antonina Ogińska) | Actor | 1908 - 1910 | 3 | |
| Owen, William | William Owen (William Owen) | Actor | 1908 | 1 | |
| O'Neil, Barry | Barry O'Neil (Barry O'Neil) | Director | 1909 | 1 | |
| Osanai, Kaoru | Kaoru Osanai (Kaoru Osanai) | Director | 1909 - 1928 | 6 | |
| Okada, Saburonosuke | Saburonosuke Okada (Saburonosuke Okada) | Designer | 1909 | 1 | |
| Odzhakov, Zhivko | Zhivko Odzhakov (Zhivko Odzhakov) | Actor | 1910 | 1 | |
| Obreschkov, Todor | Todor Obreschkov (Todor Obreschkov) | Actor | 1910 | 1 | |
| Odzhakova, Jurija | Jurija Odzhakova (Jurija Odzhakova) | Actor | 1910 | 1 | |
| Ostrowska, Franciszka | Franciszka Ostrowska (Franciszka Ostrowska) | Actor | 1910 | 2 | |
| Olram, Gunnar | Gunnar Olram (Gunnar Olram) | Actor | 1943 - 2006 | 187 | |
| Ousdal, Bodil | Bodil Ousdal (Bodil Ousdal) | Choreographer | 1985 - 1991 | 6 | |
| Orbakk, Dag Eirik | Dag Eirik Orbakk (Dag Eirik Orbakk) | Actor | 1985 | 2 | |
| Opperud, Knut | Knut Opperud (Knut Opperud) | Designer | 1994 | 1 | |
| Olason, Ragnar | Ragnar Olason (Ragnar Olason) | Actor | 1956 - 1973 | 48 | |
| Osjord, Elin | Elin Osjord (Elin Osjord) | Actor | 1991 | 1 | |
| Ottesen, Rigmor | Rigmor Ottesen (Rigmor Ottesen) | Actor | 1992 - 2007 | 32 | |
| Ottesen, Per | Per Ottesen (Per Ottesen) | Actor | 1992 - 2013 | 36 | |
| Omland, Marit Pedersen | Marit Pedersen Omland (Marit Pedersen Omland) | Actor | 1993 | 6 | |
| Ones, Arvid | Arvid Ones (Arvid Ones) | Actor, Director | 1983 - 2004 | 22 | |
| O'Neill, Dean | Dean O'Neill (Dean O'Neill) | Actor | 1993 | 1 | |
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