| Orloff, Penny | Penny Orloff | Actor | 1982 | 1 | |
| Orloff, Nicholas | Nicholas Orloff | Actor | 1908 | 1 | 1 |
| Orloff, Ida | Ida Orloff | Actor | 1905 - 1942 | 26 | |
| Orlinsky, Walter | Walter Orlinsky | Actor | 1963 | 1 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1904 - 1916 | 9 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1903 - 1909 | 4 | |
| Orliński, Bolesław | Bolesław Orliński | Actor | 1923 | 1 | |
| Orling, O. | O. Orling | Designer | 1895 | 2 | |
| Orling, E. | E. Orling | Designer | 1895 - 1896 | 6 | |
| Orlikowsky, Wazlaw | Wazlaw Orlikowsky | Adaptation, Choreographer, Director | 1956 | 3 | 1 |
| Orlik, Stanisław | Stanisław Orlik | Actor | 1904 - 1924 | 4 | |
| Orlia, Axel | Axel Orlia | Mask Maker | 1993 | 1 | |
| Orley, Ray | Ray Orley | Actor | 1965 | 1 | |
| Orlenev, Pavel | Pavel Orlenev | Actor, Director | 1903 - 1923 | 14 | 1 |
| Orlenco, Alexej | Alexej Orlenco | Actor | 2011 | 2 | |
| Orlemann, Philipp | Philipp Orlemann | Actor | 1961 | 1 | |
| Orlemann, Jed | Jed Orlemann | Actor | 2002 | 4 | |
| Orléans, Sabine | Sabine Orléans | Actor | 1994 | 3 | |
| Orlando, Carlo | Carlo Orlando | Assistant Director | 2021 | 1 | |
| Orlandini, Lia | Lia Orlandini | Actor | 1921 - 1922 | 5 | |
| Orlandini, Leo | Leo Orlandini | Actor | 1892 - 1924 | 12 | |
| Orlandini, Claudio | Claudio Orlandini | Director | 2011 | 1 | |
| Orlandini, C. | C. Orlandini | Actor | 1891 - 1892 | 3 | |
| Orlandersmith, Dael | Dael Orlandersmith | Actor | 1993 | 1 | |
| Orlandelli, Paolo | Paolo Orlandelli | Assistant Director | 2019 | 1 | |
| Orlamundt, Kai | Kai Orlamundt | Actor | 1926 | 1 | |
| Orlamundt, Hans | Hans Orlamundt | Actor | 1877 - 1880 | 13 | 1 |
| Orlac, Stephan | Stephan Orlac | Actor | 1966 | 2 | |
| Orlac, S. | S. Orlac | Director | 1995 | 1 | |
| Orkin, Andre | Andre Orkin | Actor | 1944 | 1 | |
| Orjas, José | José Orjas | Actor | 1968 | 1 | |
| Oristânio, Giuseppe | Giuseppe Oristânio | Actor | 1997 - 1998 | 3 | |
| Orion, Elizabeth | Elizabeth Orion | Actor | 1951 | 1 | |
| Orillac, Sebastian | Sebastian Orillac | Actor | 2010 | 1 | |
| Orii, Akitsu | Akitsu Orii | Musician | 2013 | 1 | |
| Orihuela, Belén | Belén Orihuela | Actor | 2009 | 1 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| Oriane, Francoise | Francoise Oriane | Actor | 1984 | 1 | |
| Orhun, Emine | Emine Orhun | Actor | 2007 | 1 | |
| Orhon, Coşkun | Coşkun Orhon | Actor | 1965 - 1971 | 2 | |
| Orheian, Vasile Ioan | Vasile Ioan Orheian | Actor | 2009 | 1 | |
| Orgulas, Jaanus | Jaanus Orgulas | Actor | 1962 - 1989 | 2 | |
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