| Obermüller, Ulrike | Ulrike Obermüller | Costume Designer | 1991 - 2016 | 2 | |
| Olich, Michael | Michael Olich | Costume Designer | 1992 | 1 | |
| O’Brien, Peter | Peter O’Brien | Costume Designer | 2015 | 1 | |
| Ogata, Kikuko | Kikuko Ogata | Costume Designer | 1968 - 2010 | 2 | |
| Oltványi, Klára | Klára Oltványi | Costume Designer | 2005 | 1 | |
| Opeka, Janel | Janel Opeka | Costume Designer | 2003 | 1 | |
| Oppenberg, Marette | Marette Oppenberg | Costume Designer | 2003 | 2 | |
| Oliver, Anna | Anna Oliver | Costume Designer | 1999 - 2010 | 3 | |
| Olsen Rosing, Anna Nuka | Anna Nuka Olsen Rosing | Costume Designer | 2005 | 1 | |
| Olesen, Ninna | Ninna Olesen | Costume Designer | 2008 | 1 | |
| Orlova, Elena, Ju. | Elena Ju. Orlova | Costume Designer | 2008 - 2011 | 2 | |
| Osborne, Dana | Dana Osborne | Costume Designer | 2011 | 1 | |
| Olsen, Oliver | Oliver Olsen | Costume Designer | 1959 | 2 | |
| Orozco, Hiram Alexander | Hiram Alexander Orozco | Costume Designer | 2016 | 1 | |
| Owen-Maclean, - | - Owen-Maclean | Costume Designer | 1950 | 1 | |
| Otero, Cachi | Cachi Otero | Costume Designer | 1971 | 3 | |
| Oditz, Carol | Carol Oditz | Costume Designer | 1981 | 1 | |
| O'Gara, Penn | Penn O'Gara | Costume Designer | 2019 | 1 | |
| Oliver, Sarah, M. | Sarah M. Oliver | Costume Designer | 2019 | 1 | |
| Obendorf, Lujo | Lujo Obendorf | Costume Designer | 1952 | 1 | |
| Oleinick, Tracy | Tracy Oleinick | Costume Designer | | 1 | |
| Oroșanu, Cristian | Cristian Oroșanu | Conductor | 2012 | 1 | |
| Olariu, Stelian | Stelian Olariu | Conductor | 2007 | 1 | |
| Oikonomou, Thodoris | Thodoris Oikonomou | Composer, Musician | 2007 - 2020 | 2 | |
| Oleś, Marcin | Marcin Oleś (Marcin Oleś) | Composer | 2006 - 2009 | 7 | |
| Oleś, Bartłomiej Brat | Bartłomiej Brat Oleś (Bartłomiej Brat Oleś) | Composer | 2006 - 2009 | 7 | |
| Otto | Otto - (Otto -) | Composer | 2002 | 1 | |
| Offenbach, Jacques | Jacques Offenbach (Jacques Offenbach) | Composer | 1880 | 1 | |
| Oberthür, Charles | Charles Oberthür (Charles Oberthür) | Composer | 1880 | 1 | |
| Ostendorf, Nils | Nils Ostendorf (Nils Ostendorf) | Composer | 2008 - 2014 | 54 | |
| O'Neill, Norman | Norman O'Neill | Composer | 1913 | 1 | |
| O'Connor, Thom | Thom O'Connor | Composer | 2013 | 1 | |
| Oliver, Stephen | Stephen Oliver | Composer | 1977 - 1983 | 9 | |
| Ostaszewski, Jakub | Jakub Ostaszewski | Composer | 1995 | 1 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | |
| O’Brien, Scott | Scott O’Brien | Composer | 2001 | 1 | |
| Olsen, Leif | Leif Olsen | Composer | 2009 | 1 | |
| O'Riada, Sean | Sean O'Riada | Composer | 1961 | 1 | |
| Ostermeier, Bettina | Bettina Ostermeier | Composer | 2011 | 1 | |
| Ortman, Anders | Anders Ortman | Composer | 2020 | 5 | |
| Odland, Bruce | Bruce Odland | Composer | 2013 | 1 | |
| Omar, Sulekha Ali | Sulekha Ali Omar (Sulekha Ali Omar) | Choreographer, Dancer | 2008 - 2010 | 4 | |
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