| Ottosson, Annelie | Annelie Ottosson | Actor | 1993 | 2 | |
| Ottlik, Ádám | Ádám Ottlik | Actor | 1996 - 2008 | 2 | 1 |
| Oberle, Carl-Friedrich | Carl-Friedrich Oberle | Costume Designer, Designer | 1994 | 2 | |
| O'Sullivan, Barney | Barney O'Sullivan | Actor | 1976 - 1980 | 2 | |
| O'Connor, Francis | Francis O'Connor | Designer, Set Designer | 2000 - 2023 | 2 | |
| Oglesby, Thomas | Thomas Oglesby | Actor | 1977 - 1980 | 2 | 1 |
| Ohlsson, Marika | Marika Ohlsson | Actor | 1997 | 2 | |
| Ohara, Ken | Ken Ohara | Actor | 1996 - 1997 | 2 | |
| Olsson, Inge | Inge Olsson | Actor | 1997 | 2 | |
| Olsson, Nicholas | Nicholas Olsson | Actor | 1996 - 1997 | 2 | |
| Ożana, Edward | Edward Ożana | Actor | 1970 - 1975 | 2 | |
| Oubram, Stanislav | Stanislav Oubram | Actor | 1969 - 2006 | 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 | 1 |
| Ohlsson, Marrit | Marrit Ohlsson | Actor | 1947 - 1966 | 2 | |
| Orosz, Helga | Helga Orosz | Actor | 2005 | 2 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | 1 |
| 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 | 1 |
| O'Brien, Jim | Jim O'Brien | Actor | 2004 - 2021 | 2 | 1 |
| Olden, Terje | Terje Olden | Actor | 2004 | 2 | |
| Ostrowski, Andrew David | Andrew David Ostrowski | Lighting Designer | 2005 - 2007 | 2 | |
| O'Donnell, Vayu | Vayu O'Donnell | Actor | 2005 - 2016 | 2 | |
| Oľšavská, Antónia | Antónia Oľšavská | Actor | 2012 | 2 | |
| Olejár, Peter | Peter Olejár | Actor | 2012 | 2 | |
| Ochránek, Marcel | Marcel Ochránek | Actor | 2007 - 2008 | 2 | |
| Ogrodnik, Dawid | Dawid Ogrodnik | Actor | 2011 - 2025 | 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 | 1 |
| Oikonomou, Thodoris | Thodoris Oikonomou | Composer, Musician | 2007 - 2020 | 2 | |
| Ontiveros, Montserrat | Montserrat Ontiveros | Actor | 2006 | 2 | |
| Ocampo, Pavel | Pavel Ocampo | Musician | 2006 | 2 | |
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