| O'Connor, Declan | Declan O'Connor | Actor | 2017 | 1 | |
| O'Connell, Janine | Janine O'Connell | Actor | 1971 | 1 | |
| Ostrander, Ruth | Ruth Ostrander | Actor | 1947 | 1 | |
| Oldfield, Ben | Ben Oldfield | Actor | 2000 | 1 | |
| Oehmig, Franz | Franz Oehmig | Actor | 1900 | 1 | |
| Orwoll, Styrk | Styrk Orwoll | Actor | 1948 | 1 | |
| Ohlin, Nils | Nils Ohlin | Actor | 1948 | 1 | |
| O'Reilly, Alpho | Alpho O'Reilly | Actor | 1948 | 1 | |
| Oglesby, Ethel | Ethel Oglesby | Actor | 1949 | 1 | |
| O'Connor, Tim | Tim O'Connor | Actor | 1949 | 1 | |
| O'Malley, Tom | Tom O'Malley | Actor | 1949 | 4 | |
| Orlov, Aleksandr | Aleksandr Orlov | Actor | 2000 | 1 | |
| Orliński, Bolesław | Bolesław Orliński | Actor | 1923 | 1 | |
| Ohtaki, Hiroko | Hiroko Ohtaki | Actor | 2000 | 1 | |
| Oraloğlu, Alev | Alev Oraloğlu (Alev Oraloglu) | Actor | 2012 | 1 | |
| Olska, Maria | Maria Olska | Actor | 1925 | 1 | |
| Orbán, Levente | Levente Orbán | Actor | 2016 | 2 | |
| Ozker, Eren | Eren Ozker | Actor | 1971 | 1 | |
| O'Hara, Jill | Jill O'Hara | Actor | 1971 | 1 | |
| Ohlin, Bjarne | Bjarne Ohlin | Actor | 1971 | 4 | |
| Ognyanova, Rositsa | Rositsa Ognyanova | Actor | 2015 - 2016 | 2 | |
| O'Hara, Lesley | Lesley O'Hara | Actor | 1972 | 1 | |
| Owen, George | George Owen | Actor | 1911 - 1912 | 5 | |
| Ortmann, Wilfried | Wilfried Ortmann | Actor | 1973 | 1 | |
| Olson, Marlo | Marlo Olson | Actor | 2017 | 1 | |
| Oatley, Carl | Carl Oatley | Actor | 1975 | 1 | |
| Orhon, Coşkun | Coşkun Orhon (Coskun Orhon) | Actor | 1965 - 1971 | 2 | |
| Oktav, Burcu | Burcu Oktav (Burcu Oktav) | Actor | 2017 | 1 | |
| Owens, Andrew | Andrew Owens | Actor | 2017 | 1 | |
| Ona, Bjørn | Bjørn Ona | Actor | 1985 | 1 | |
| O'Brien, Terence | Terence O'Brien | Actor | 1917 | 1 | |
| Ohtsuka, Michiko | Michiko Ohtsuka | Actor | 1978 | 1 | |
| Obino, Kinji | Kinji Obino | Actor | 1978 | 1 | |
| Obino, Tetsushi | Tetsushi Obino | Actor | 1978 | 1 | |
| Ohtori, Yachiyo | Yachiyo Ohtori | Actor | 1978 | 1 | |
| Oostveen, Anne | Anne Oostveen | Actor | 1978 | 1 | |
| Olohan, John | John Olohan | Actor | 1980 | 16 | |
| O'Hanlon, Máire | Máire O'Hanlon | Actor | 1980 | 16 | |
| Ortíz, Nancy | Nancy Ortíz | Actor | 1980 | 1 | |
| Ortíz, Norma-Norma | Norma-Norma Ortíz | Actor | 1980 | 1 | |
| Osske, Tamara | Tamara Osske | Actor | 1980 | 1 | |
| O'Mara, Kate | Kate O'Mara | Actor | 1981 | 1 | |
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