| Oschlag, Jakob | Jakob Oschlag | Adaptation, Director | 1977 - 2001 | 8 | |
| Osborne, John | John Osborne | Adaptation, Translator | 1972 - 2011 | 8 | |
| Ostendorf, Josef | Josef Ostendorf | Actor | 1991 - 2016 | 8 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| Ojamaa, Pekka | Pekka Ojamaa | Costume Designer, Designer | 1990 - 2001 | 9 | |
| Orliński, Janusz | Janusz Orliński | Actor | 1904 - 1916 | 9 | |
| Otterström, Ludvig | Ludvig Otterström | Actor | 1883 - 1885 | 9 | |
| Oppel, Georg | Georg Oppel | Actor | 1893 - 1926 | 9 | |
| Ottmann, Victor | Victor Ottmann | Translator | 1901 - 1902 | 9 | 1 |
| Onno, Ferdinand | Ferdinand Onno | Actor | 1904 - 1938 | 9 | |
| O’Brien, Fergus | Fergus O’Brien | Sound Designer | 2006 | 9 | |
| Ott, Gisa | Gisa Ott | Actor | 1910 - 1941 | 9 | |
| Osa, Liv Bernhoft | Liv Bernhoft Osa | Actor | 1993 - 2020 | 9 | 2 |
| Ortiz, Esperanza | Esperanza Ortiz | Actor | 1928 - 1929 | 9 | |
| Oliver, Stephen | Stephen Oliver | Composer | 1977 - 1983 | 9 | |
| Orcier, Sylvie | Sylvie Orcier | Designer | 2004 - 2005 | 9 | |
| Obregon, Gustavo | Gustavo Obregon | Actor | 2009 | 9 | |
| Olsen, Augusta | Augusta Olsen | Actor | 1907 | 10 | |
| Oswald, Richard | Richard Oswald | Actor, Director, Producer | 1910 - 1919 | 10 | |
| Ottzenn, Paula | Paula Ottzenn | Actor | 1919 - 1936 | 10 | |
| Olsson, Tove | Tove Olsson | Actor | 2008 | 10 | 2 |
| Ooms, Richard | Richard Ooms | Actor | 1983 - 2008 | 10 | |
| O'Mahoney, Robert | Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |
| O'Brien, Jackie | Jackie O'Brien | Actor | 2006 | 10 | |
| Ottersen, Kyrre, Eikås | Kyrre Eikås Ottersen | Actor | 2004 - 2016 | 10 | |
| Olympios, Spyros | Spyros Olympios | Actor, Dancer | 1935 - 1997 | 10 | |
| Olsen, Ragnar | Ragnar Olsen | Translator | 2018 | 10 | |
| Ottesen, Marian Saastad | Marian Saastad Ottesen | Actor | 2006 - 2021 | 11 | 2 |
| Olaussen, Vidar | Vidar Olaussen | Actor | 1999 - 2006 | 11 | |
| Otterstedt, Lars | Lars Otterstedt | Actor | 2006 | 11 | |
| Oechslin, Ary | Ary Oechslin | Costume Designer, Designer | 1952 - 1978 | 11 | |
| Oakeshott, Owen | Owen Oakeshott | Actor | 2013 - 2014 | 11 | 1 |
| Otto, Philipp | Philipp Otto | Actor | 2002 - 2015 | 11 | |
| Orella, Francesc | Francesc Orella | Actor | 2007 - 2013 | 11 | |
| O'Brien, Timothy | Timothy O'Brien | Costume Designer, Designer | 1964 - 1996 | 12 | |
| Orlandini, Leo | Leo Orlandini | Actor | 1892 - 1924 | 12 | |
| Opøien, Lydia | Lydia Opøien | Actor | 1924 - 2006 | 12 | |
| Oskar, Otto | Otto Oskar | Actor | 1898 - 1916 | 12 | |
| Otto, Thomas | Thomas Otto | Actor | 1983 - 1993 | 12 | |
| Olesen, Kirsten | Kirsten Olesen | Actor | 1978 - 2011 | 12 | 1 |
| Ott, Friederike | Friederike Ott | Actor | 2014 - 2016 | 12 | |
| Olvera, Viridiana | Viridiana Olvera | Actor | 2006 | 12 | |
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