| Oramusc, Anna | Anna Oramusc | Costume Designer | 2022 | 1 | |
| Olamina, Winter | Winter Olamina | Costume Designer | 2025 | 1 | |
| Oulette, Nancy | Nancy Oulette | Costume Designer | 2025 | 1 | |
| Oroșanu, Cristian | Cristian Oroșanu | Conductor | 2012 | 1 | |
| Olariu, Stelian | Stelian Olariu | Conductor | 2007 | 1 | |
| Ovodok, Vladimir | Vladimir Ovodok | Conductor | 2020 | 1 | |
| Oikonomou, Thodoris | Thodoris Oikonomou | Composer, Musician | 2007 - 2020 | 2 | |
| Oleś, Marcin | Marcin Oleś | Composer | 2006 - 2009 | 7 | |
| Oleś, Bartłomiej Brat | Bartłomiej Brat Oleś | Composer | 2006 - 2009 | 7 | |
| Otto | Otto - | Composer | 2002 | 1 | |
| Offenbach, Jacques | Jacques Offenbach | Composer | 1880 | 1 | |
| Oberthür, Charles | Charles Oberthür | Composer | 1880 | 1 | |
| Ostendorf, Nils | Nils Ostendorf | Composer | 2008 - 2014 | 54 | 1 |
| O'Neill, Norman | Norman O'Neill | Composer | 1913 | 1 | |
| O'Connor, Thom | Thom O'Connor | Composer | 2013 | 1 | |
| Ostaszewski, Jakub | Jakub Ostaszewski | Composer | 1995 | 1 | |
| Orbán, György | György Orbán | Composer | 1972 - 2002 | 2 | 1 |
| 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 | Choreographer, Dancer | 2008 - 2010 | 4 | |
| Orlovsky, Claudia | Claudia Orlovsky | Choreographer | 1998 | 1 | |
| O'Kelly, Geri | Geri O'Kelly | Choreographer | 1993 | 1 | |
| Oscar, - | - Oscar | Choreographer | 2006 | 1 | |
| Owen, Sally | Sally Owen | Choreographer | 2010 | 1 | |
| Oehlschläger, Margarethe | Margarethe Oehlschläger | Choreographer | 1921 | 1 | |
| Ornelli, Otto | Otto Ornelli | Choreographer | 1938 | 1 | |
| Ousdal, Bodil | Bodil Ousdal | Choreographer | 1985 - 1991 | 6 | |
| Osuldsen, Johan | Johan Osuldsen | Choreographer | 1998 - 2000 | 3 | |
| Ogoun, Luboš | Luboš Ogoun | Choreographer | 1986 | 1 | |
| O'Neill, Katherine | Katherine O'Neill | Choreographer | 2004 | 1 | |
| Obradović, Vera | Vera Obradović | Choreographer | 2005 | 1 | |
| Oščepkov, Artur | Artur Oščepkov | Choreographer | 2013 | 1 | |
| Ogurlieva, Irina | Irina Ogurlieva (Ирина Огурлиева) | Choreographer | 2024 | 1 | |
| O’Rourke, Rylee | Rylee O’Rourke | Assistant Director, Producer | 2020 - 2022 | 2 | |
| Olsoni, Kristin | Kristin Olsoni | Assistant Director | 1991 - 2006 | 2 | |
| Oestereich, Tilman | Tilman Oestereich | Assistant Director | 2013 | 1 | |
| Odağ, Efsane | Efsane Odağ | Assistant Director | 2019 | 1 | |
| Oberhäußer, Frank | Frank Oberhäußer | Assistant Director | 2006 | 1 | |
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