| Orcier, Fabien | Fabien Orcier | Actor | 2004 - 2005 | 72 | |
| Orcier, Sylvie | Sylvie Orcier | Designer | 2004 - 2005 | 9 | |
| Orck, Charles | Charles Orck | Actor | 1970 | 1 | |
| Orczy, Odette | Odette Orczy | Actor | 1931 | 1 | |
| Orczyńska, Mieczysława | Mieczysława Orczyńska | Actor | 1911 | 1 | |
| Ordeman, Lee | Lee Ordeman | Actor | 2012 | 1 | 4 |
| Ordężanka, Janina | Janina Ordężanka | Actor | 1911 | 1 | |
| Ording, Jørn | Jørn Ording | Actor, Director | 1938 - 1978 | 69 | 1 |
| Ordóñez, María | María Ordóñez | Actor | 2023 | 1 | |
| Ordonówna, Władysława | Władysława Ordonówna | Actor | 1904 | 1 | |
| Orea, Mario | Mario Orea | Actor | 1961 - 1963 | 2 | |
| Oredsson, Thomas | Thomas Oredsson | Actor | 1975 - 1997 | 27 | |
| Orell, Heinrich | Heinrich Orell | Actor, Director | 1911 | 2 | |
| 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 | |
| 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 | |
| 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 | |
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