| O’Rowe, Mark | Mark O’Rowe | Adaptation, Director | 2015 - 2023 | 2 | |
| Ostroróg, Mieczysław | Mieczysław Ostroróg | Actor | 1968 | 2 | |
| Oettinger, Karen | Karen Oettinger | Actor | 1968 | 2 | |
| Olty, Magda | Magda Olty | Actor | 1935 - 1941 | 2 | |
| Ogata, Kikuko | Kikuko Ogata | Costume Designer | 1968 - 2010 | 2 | |
| Oszter, Sándor | Sándor Oszter | Actor | 1978 - 2007 | 2 | |
| Ohlsson, Marrit | Marrit Ohlsson | Actor | 1947 - 1966 | 2 | |
| Orosz, Helga | Helga Orosz | Actor | 2005 | 2 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | |
| Ostrugnaj, Anton | Anton Ostrugnaj | Actor | 2002 | 2 | |
| Ott, Marcel | Marcel Ott | Actor | 2002 | 2 | |
| Olinger, Marc | Marc Olinger | Actor | 2003 | 2 | |
| Ocampo, Paul | Paul Ocampo | Actor, Dancer | 2001 | 2 | |
| Oppenberg, Marette | Marette Oppenberg | Costume Designer | 2003 | 2 | |
| O'Brien, Jim | Jim O'Brien | Actor | 2004 - 2021 | 2 | |
| Olden, Terje | Terje Olden | Actor | 2004 | 2 | |
| Ostrowski, Andrew David | Andrew David Ostrowski | Lighting Designer | 2005 - 2007 | 2 | |
| Oľšavská, Antónia | Antónia Oľšavská | Actor | 2012 | 2 | |
| Olejár, Peter | Peter Olejár | Actor | 2012 | 2 | |
| Ochránek, Marcel | Marcel Ochránek | Actor | 2007 - 2008 | 2 | |
| Olszewska, Jolanta | Jolanta Olszewska | Actor | 2007 | 2 | |
| Otani, Hayato | Hayato Otani | Lighting Designer | 2006 | 2 | |
| Okada, Yoshihiro | Yoshihiro Okada | Actor | 1999 - 2006 | 2 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Olsson, Marie | Marie Olsson | Costume Designer, Designer | 2014 | 2 | |
| Oxlade, Jonathon | Jonathon Oxlade | Costume Designer, Designer | 2007 | 2 | |
| Oikonomou, Thodoris | Thodoris Oikonomou | Composer, Musician | 2007 - 2020 | 2 | |
| Ontiveros, Montserrat | Montserrat Ontiveros | Actor | 2006 | 2 | |
| Ocampo, Pavel | Pavel Ocampo | Musician | 2006 | 2 | |
| O'Connell, Caitlin | Caitlin O'Connell | Actor | 2006 - 2009 | 2 | |
| Olisah, Paul | Paul Olisah | Actor, Designer | 2002 | 2 | |
| Olsoni, Kristin | Kristin Olsoni | Assistant Director | 1991 - 2006 | 2 | |
| Ohba, Ai | Ai Ohba | Actor | 2006 - 2009 | 2 | |
| Ono Seo, Rie | Rie Ono Seo | Lighting Designer | 2009 - 2010 | 2 | |
| Ockel, Reinhold | Reinhold Ockel | Designer, Director | 1927 - 1942 | 2 | |
| O'Shaughnessy, Fiona | Fiona O'Shaughnessy | Actor | 2008 | 2 | |
| Orsini, Elena | Elena Orsini | Actor | 2016 - 2017 | 2 | |
| Orlova, Elena, Ju. | Elena Ju. Orlova | Costume Designer | 2008 - 2011 | 2 | |
| Omdal, Adrian | Adrian Omdal | Actor | 2016 - 2017 | 2 | |
| Obi, Christopher | Christopher Obi | Actor | 2008 | 2 | |
| O'Dowd, Spencer | Spencer O'Dowd | Actor | 2008 | 2 | |
| Orlac, Stephan | Stephan Orlac | Actor | 1966 | 2 | |
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