| Name | Functions | Event Dates | Events  | Resources | ||
|---|---|---|---|---|---|---|
| Vidar Olaussen | Actor | 1999 - 2006 | 11 | |||
| Lars Otterstedt | Actor | 2006 | 11 | 1 | ||
| Ary Oechslin | Costume Designer, Designer | 1952 - 1978 | 11 | 1 | ||
| Owen Oakeshott | Actor | 2013 - 2014 | 11 | 1 | ||
| Philipp Otto | Actor | 2002 - 2015 | 11 | 1 | ||
| Francesc Orella | Actor | 2007 - 2013 | 11 | |||
| Elena Orsini | Actor | 2016 - 2017 | 11 | |||
| Timothy O'Brien | Costume Designer, Designer | 1964 - 1996 | 12 | |||
| Leo Orlandini | Actor | 1892 - 1924 | 12 | |||
| Otto Oskar | Actor | 1898 - 1916 | 12 | |||
| Thomas Otto | Actor | 1983 - 1993 | 12 | |||
| Kirsten Olesen | Actor | 1978 - 2011 | 12 | 2 | ||
| Friederike Ott | Actor | 2014 - 2016 | 12 | 1 | ||
| Viridiana Olvera | Actor | 2006 | 12 | |||
| Kathrin Ost | Actor | 2010 - 2011 | 12 | 2 | ||
| Frances Oduwole | Actor | 2011 | 12 | |||
| Andrew Oduwole | Actor | 2011 | 12 | |||
| Ayo Oduwole | Actor | 2011 | 12 | |||
| Margarethe Otto-Körner | Actor | 1898 - 1929 | 13 | |||
| Heinrich Oppermann | Actor | 1895 - 1925 | 13 | |||
| Hans Orlamundt | Actor | 1877 - 1880 | 13 | 1 | ||
| Elita Proctor Otis | Actor | 1903 | 13 | |||
| Lydia Opøien | Actor | 1923 - 2006 | 13 | 1 | ||
| Elvira Onetto | Actor | 2009 - 2011 | 13 | 1 | ||
| Laura Ozier | Mask Maker | 2000 - 2004 | 13 | |||
| Shonosuke Okura | Actor | 2005 - 2013 | 14 | |||
| Teo Otto | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |||
| Pavel Orlenev | Actor, Director | 1903 - 1923 | 14 | 1 | ||
| Gunhild Mathea Olaussen | Actor | 1994 - 2000 | 14 | |||
| Svein Olstad | Actor | 1999 - 2013 | 14 | |||
| Ladislav Obuch | Translator | 1955 - 2021 | 14 | 1 | ||
| Floor Oskam | Designer | 1991 - 1992 | 14 | |||
| Hildegard Osterloh | Actor | 1910 - 1916 | 15 | |||
| Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |||
| Florian Odendahl | Actor | 2004 - 2005 | 15 | |||
| Keiko Ogawa | Actor | 1999 - 2012 | 16 | |||
| Aydin Orak | Actor, Translator | 2010 | 16 | 2 | ||
| Julius Olbrich | Actor | 1876 - 1910 | 16 | |||
| Yoshihiko Oe | Dramaturg | 2010 | 16 | |||
| Mayumi Ozora | Actor | 2010 | 16 | |||
| John Olohan | Actor | 1980 | 16 | |||
| Máire O'Hanlon | Actor | 1980 | 16 | |||