| Olejár, Peter | Peter Olejár | Actor | 2012 | 2 | |
| Ondrejková, Bibiana | Bibiana Ondrejková | Actor | 1999 | 1 | |
| Ochránek, Marcel | Marcel Ochránek | Actor | 2007 - 2008 | 2 | |
| Osthoff, Sabine | Sabine Osthoff | Actor | 2005 | 1 | |
| Ojrzyńska, Marta | Marta Ojrzyńska | Actor | 2011 | 1 | |
| Ogrodnik, Dawid | Dawid Ogrodnik | Actor | 2011 | 1 | |
| Olszewska, Jolanta | Jolanta Olszewska | Actor | 2007 | 2 | |
| Osiński, Szymon | Szymon Osiński | Actor | 2007 | 4 | |
| Ostaszewska, Krystyna | Krystyna Ostaszewska | Actor | 1957 | 1 | |
| Oarcea, Sibylla | Sibylla Oarcea | Actor | 1972 | 4 | |
| O`Neill, Aisling | Aisling O`Neill | Actor | 2001 | 1 | |
| Orth, Theo | Theo Orth | Actor | 1900 | 1 | |
| Oniga, Laurian | Laurian Oniga | Designer | 1985 | 3 | |
| Olsson, Björn | Björn Olsson | Actor | 2001 | 1 | |
| Oltean, Silviu | Silviu Oltean | Actor | 2009 | 3 | |
| Olaru, Orodel | Orodel Olaru | Actor | 2009 | 4 | |
| Orheian, Vasile Ioan | Vasile Ioan Orheian | Actor | 2009 | 1 | |
| Otani, Hayato | Hayato Otani | Lighting Designer | 2006 | 2 | |
| Okada, Yoshihiro | Yoshihiro Okada | Actor | 1999 - 2006 | 2 | |
| Ortiz, Alain | Alain Ortiz | Designer | 2006 | 3 | |
| O'Malley, Geraldine | Geraldine O'Malley | Costume Designer, Designer | 1989 - 1990 | 4 | |
| Oliver, Barbara | Barbara Oliver | Actor, Director | 2006 - 2010 | 3 | |
| Oswald, Simone | Simone Oswald | Actor | 2006 | 1 | |
| Oxnam, Brad | Brad Oxnam | Actor | 2006 | 1 | |
| O'Neal, Timothy | Timothy O'Neal | Actor | 2006 | 1 | |
| Osgood, Erin | Erin Osgood | Actor | 2006 | 1 | |
| Orella, Francesc | Francesc Orella | Actor | 2007 - 2013 | 11 | |
| Oliver, Elinor | Elinor Oliver | Actor | 1922 | 1 | |
| Olvera, Viridiana | Viridiana Olvera | Actor | 2006 | 12 | |
| O'Brien, Patrick | Patrick O'Brien | Actor | 2006 | 1 | |
| Otteni, Stefan | Stefan Otteni | Director | 2006 | 1 | |
| Ovčinnikov, Jurij | Jurij Ovčinnikov | Actor | 2007 | 1 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Obenius, Frej | Frej Obenius | Sound Designer | 2015 | 1 | |
| 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 | |
| Otani, Ro | Ro Otani | Actor | 2006 | 1 | |
| Owen, Lisa | Lisa Owen | Actor | 2006 | 1 | |
| Oura, Mizuki | Mizuki Oura | Actor | 2006 | 3 | |
| Ontiveros, Montserrat | Montserrat Ontiveros | Actor | 2006 | 2 | |
| Ocampo, Pavel | Pavel Ocampo | Musician | 2006 | 2 | |
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