| Orella, Francesc | Francesc Orella | Actor | 2007 - 2013 | 11 | |
| Orendy, C. | C. Orendy | Actor | 1920 - 1928 | 3 | |
| Orenstein, Joan | Joan Orenstein | Actor | 1981 - 1991 | 3 | |
| Orenstein, Sarah | Sarah Orenstein | Actor | 2004 | 1 | 1 |
| Orešković, Želimir | Želimir Orešković | Director | 1975 - 1989 | 3 | 1 |
| Orfanidis, Stelios | Stelios Orfanidis | Designer | 1949 | 1 | |
| Orfanos, Lampros | Lampros Orfanos | Costume Designer, Designer | 1943 | 2 | |
| Orford, Cathleen | Cathleen Orford | Actor | 1913 - 1918 | 4 | |
| Orgal, Yehiel | Yehiel Orgal | Lighting Designer | 1995 | 1 | |
| Organ, Alex | Alex Organ | Actor, Sound Designer | 2002 | 2 | |
| Orgill, Paul | Paul Orgill | Actor | 1973 | 1 | |
| Orgler, Wolfgang | Wolfgang Orgler | Actor | 2024 | 1 | |
| Orgulas, Jaanus | Jaanus Orgulas | Actor | 1962 - 1989 | 2 | |
| Orheian, Vasile Ioan | Vasile Ioan Orheian | Actor | 2009 | 1 | |
| Orhon, Coşkun | Coşkun Orhon | Actor | 1965 - 1971 | 2 | |
| Orhun, Emine | Emine Orhun | Actor | 2007 | 1 | |
| Ori, Benedetta | Benedetta Ori | Actor | 1999 | 2 | |
| Oriane, Francoise | Francoise Oriane | Actor | 1984 | 1 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| Orihuela, Belén | Belén Orihuela | Actor | 2009 | 1 | |
| Orii, Akitsu | Akitsu Orii | Musician | 2013 | 1 | |
| Orillac, Sebastian | Sebastian Orillac | Actor | 2010 | 1 | |
| Orion, Elizabeth | Elizabeth Orion | Actor | 1951 | 1 | |
| Oristânio, Giuseppe | Giuseppe Oristânio | Actor | 1997 - 1998 | 3 | |
| Orjas, José | José Orjas | Actor | 1968 | 1 | |
| Orkin, Andre | Andre Orkin | Actor | 1944 | 1 | |
| Orlac, S. | S. Orlac | Director | 1995 | 1 | |
| Orlac, Stephan | Stephan Orlac | Actor | 1966 | 2 | |
| Orlamundt, Hans | Hans Orlamundt | Actor | 1877 - 1880 | 13 | 1 |
| Orlamundt, Kai | Kai Orlamundt | Actor | 1926 | 1 | |
| Orlandelli, Paolo | Paolo Orlandelli | Assistant Director | 2019 | 1 | |
| Orlandersmith, Dael | Dael Orlandersmith | Actor | 1993 | 1 | |
| Orlandini, C. | C. Orlandini | Actor | 1891 - 1892 | 3 | |
| Orlandini, Claudio | Claudio Orlandini | Director | 2011 | 1 | |
| Orlandini, Gianluca | Gianluca Orlandini | Director | 2003 | 1 | |
| Orlandini, Leo | Leo Orlandini | Actor | 1892 - 1924 | 12 | |
| Orlandini, Lia | Lia Orlandini | Actor | 1921 - 1922 | 5 | |
| Orlandini, Veronica | Veronica Orlandini | Actor | 2015 | 1 | |
| Orlando, Carlo | Carlo Orlando | Assistant Director | 2021 | 3 | |
| Orléans, Sabine | Sabine Orléans | Actor | 1994 | 3 | |
| Orlemann, Jed | Jed Orlemann | Actor | 2002 | 4 | |
| Orlemann, Philipp | Philipp Orlemann | Actor | 1961 | 1 | |
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