| Otto, Teo | Teo Otto | Costume Designer, Designer, Director | 1934 - 1959 | 14 | |
| Ovanessian, Arby | Arby Ovanessian | Costume Designer, Designer, Director | 1970 | 3 | 1 |
| Oenslager, Donald | Donald Oenslager | Costume Designer, Designer, Lighting Designer | 1934 - 1951 | 19 | 1 |
| Opsvig, Virginia | Virginia Opsvig | Costume Designer, Mask Maker | 1931 - 1936 | 4 | |
| Olenina, E. | E. Olenina | Dancer | 1999 - 2000 | 2 | |
| Olstad, Jon Ole | Jon Ole Olstad | Dancer | 2011 | 1 | |
| Olsen, Gudrun | Gudrun Olsen | Dancer | 1928 | 1 | |
| Okafor, Stella C | Stella C Okafor | Dancer | 2002 | 1 | |
| Okafor, Stella O | Stella O Okafor | Dancer | 2002 | 1 | |
| Olsen, Mikkel, Are | Mikkel Are Olsen | Dancer | 2006 | 1 | |
| O'Donnell, Carolyn | Carolyn O'Donnell | Dancer | 1956 | 1 | |
| Oulianine, Nina | Nina Oulianine | Dancer | 1937 | 1 | |
| Olsen, Lisbeth-Anita, Grimsø | Lisbeth-Anita Grimsø Olsen | Dancer | 2017 | 1 | |
| Okun, Alexander | Alexander Okun | Designer | 1992 - 2003 | 3 | 1 |
| Otto, Wilfried | Wilfried Otto | Designer | 1958 | 1 | |
| Owen, Hugh | Hugh Owen | Designer | 1927 | 1 | |
| Orling, O. | O. Orling | Designer | 1895 | 2 | |
| Orling, E. | E. Orling | Designer | 1895 - 1896 | 6 | |
| og Bauer, Breitner | Breitner og Bauer | Designer | 1897 | 1 | |
| Obstfelder, Helmut | Helmut Obstfelder | Designer | 1949 | 1 | |
| Okada, Saburonosuke | Saburonosuke Okada | Designer | 1909 | 1 | |
| Opperud, Knut | Knut Opperud | Designer | 1994 | 1 | |
| Opstad, Eva Cathrine | Eva Cathrine Opstad | Designer | 2007 | 1 | |
| Obolensky, Chloé | Chloé Obolensky | Designer | 2011 | 1 | 1 |
| Otto, Bailey | Bailey Otto | Designer | 2014 | 1 | |
| Odvárková, Lenka | Lenka Odvárková | Designer | 2009 - 2011 | 3 | |
| O'Hara, Caitlin | Caitlin O'Hara | Designer | 2013 | 1 | |
| Olson, Stephan | Stephan Olson | Designer | 1990 | 1 | |
| O´Byrne, Louis | Louis O´Byrne | Designer | 1991 | 1 | |
| Ormerod, Nick | Nick Ormerod | Designer | 1990 | 1 | 1 |
| Okazaki, Shinobu | Shinobu Okazaki | Designer | 1991 | 1 | |
| Oskam, Floor | Floor Oskam | Designer | 1991 - 1992 | 14 | |
| O'Connor, Francis | Francis O'Connor | Designer | 2000 | 1 | |
| Oman, Julia, Trevelyan | Julia Trevelyan Oman | Designer | 1980 | 1 | |
| Oldman, David | David Oldman | Designer | 1996 | 1 | |
| Oswald, Cornelius | Cornelius Oswald | Designer | 2014 | 1 | 1 |
| Oliver, Simon | Simon Oliver | Designer | 2002 | 1 | |
| Orcier, Sylvie | Sylvie Orcier | Designer | 2004 - 2005 | 9 | |
| O'Hare, Tim | Tim O'Hare | Designer | 2004 | 1 | |
| Oniga, Laurian | Laurian Oniga | Designer | 1985 | 3 | |
| Ortiz, Alain | Alain Ortiz | Designer | 2006 | 3 | |
| Ogazi, Solomon | Solomon Ogazi | Designer | 2002 | 1 | |
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