| Name | Functions | Event Dates | Events | Resources  | ||
|---|---|---|---|---|---|---|
| Kristen O'Rourke | Actor | 2009 | 1 | |||
| Rie Ono Seo | Lighting Designer | 2009 - 2010 | 2 | |||
| Michelle O'Neill | Actor | 2008 | 3 | |||
| Henry Odum | Actor | 2009 | 1 | |||
| Aigars Ozoliņš | Designer | 2008 | 1 | |||
| Barret O'Brien | Actor | 2008 | 1 | |||
| Reinhold Ockel | Designer, Director | 1927 - 1942 | 2 | |||
| Totti Oja | Actor | 2008 | 1 | |||
| Philip Ortolani | Actor | 2008 | 1 | |||
| Ninna Olesen | Costume Designer | 2008 | 1 | |||
| Fiona O'Shaughnessy | Actor | 2008 | 2 | |||
| Elena Orsini | Actor | 2016 - 2017 | 11 | |||
| Alex Oberheide | Actor | 2008 | 1 | |||
| Ryan O'Shea | Actor | 2008 | 1 | |||
| Elena Ju. Orlova | Costume Designer | 2008 - 2011 | 2 | |||
| Adrian Omdal | Actor | 2016 - 2017 | 2 | |||
| Kyrre Eikås Ottersen | Actor | 2004 - 2016 | 10 | |||
| Violet O´Valle | Director | 2008 | 1 | |||
| Christopher Obi | Actor | 2008 | 2 | |||
| Hans Ohloff | Actor | 1939 | 1 | |||
| Connie Orr | Actor | 1965 | 1 | |||
| Spencer O'Dowd | Actor | 2008 | 2 | |||
| Ryoichi Okubo | Actor | 2008 | 1 | |||
| Edgar Olt | Actor | 1955 | 3 | |||
| Margot Otenbacher | Actor | 1959 | 1 | |||
| Josef Ostendorf | Actor | 1991 - 2016 | 8 | |||
| Stephan Orlac | Actor | 1966 | 2 | |||
| Tim Olsen | Actor | 2009 | 1 | |||
| Akane Ohkuwa | Actor | 2009 | 1 | |||
| Vincent O'Neill | Actor | 2009 | 1 | |||
| Frank-Tilmann Otto | Costume Designer, Designer | 2008 | 4 | |||
| Koji Okukawa | Actor | 2008 - 2010 | 5 | |||
| Max Julian Otto | Designer | 2008 - 2009 | 4 | |||
| Andrei Onegin | Designer | 2009 | 1 | |||
| Leif Olsen | Composer | 2009 | 1 | |||
| James Ogden | Designer | 2009 | 1 | |||
| Robert Oakes | Adaptation | 2009 | 1 | |||
| Minako Ohkawa | Actor | 2008 - 2009 | 6 | |||
| Y. Ono | Dramaturg | 2008 - 2009 | 3 | |||
| Joanna Ortiz | Actor | 2008 | 1 | |||
| Karl Ott | Actor | 1880 - 1893 | 3 | |||
| Gisela Ott | Actor | 1889 | 1 | |||