| Jeffrey, Clare | Clare Jeffrey | Costume Designer | 1978 - 1979 | 2 | 1 |
| Jacobs, Carin | Carin Jacobs | Costume Designer | 2018 | 1 | |
| Jularić, Oliver | Oliver Jularić | Costume Designer | 2017 - 2021 | 2 | |
| Jiryis, Ihab | Ihab Jiryis | Costume Designer | 2020 | 1 | |
| Jakobsen, Else, Ciljan | Else Ciljan Jakobsen | Costume Designer | 2019 - 2021 | 5 | |
| Juvik Pedersen, Marianne | Marianne Juvik Pedersen | Costume Designer | 2008 | 1 | |
| Jasselette, Florence | Florence Jasselette | Costume Designer | 2021 - 2023 | 2 | |
| Juhrke, Werner | Werner Juhrke | Costume Designer | 1966 | 1 | |
| Jones, Pam | Pam Jones | Costume Designer | 2024 | 1 | |
| Johnston, Gillian | Gillian Johnston | Costume Designer | 2024 | 1 | |
| Jovanović, Stanko | Stanko Jovanović | Conductor | 2011 | 1 | |
| Jensen, Eivind, Gullberg | Eivind Gullberg Jensen | Conductor | 2013 | 1 | 1 |
| Jonas, Rudolf | Rudolf Jonas | Conductor | 1918 | 1 | |
| Jensen, Thomas | Thomas Jensen | Conductor | 1935 - 1943 | 2 | |
| Johnson, Milton | Milton Johnson | Conductor | 1940 | 1 | |
| Joneš, Boris | Boris Joneš | Conductor | 1985 | 1 | |
| Järnefelt, Armas | Armas Järnefelt | Conductor | 1914 | 1 | |
| Jacobson, Ilja | Ilja Jacobson | Conductor | 1928 | 1 | |
| Järvi, Neeme | Neeme Järvi | Conductor | 2006 | 1 | |
| John, Alan | Alan John | Composer, Sound Designer | 2002 - 2017 | 5 | 1 |
| Johnson, Aaron Krister | Aaron Krister Johnson | Composer, Sound Designer | 2004 | 2 | |
| Johannesen, Terje | Terje Johannesen | Composer, Musician | 2002 - 2016 | 11 | 1 |
| Jensen, Geir | Geir Jensen | Composer, Musician | 2007 - 2019 | 3 | |
| Jacques, Sylvain | Sylvain Jacques | Composer, Musical Director | 2006 - 2026 | 5 | |
| Joannides, Alex | Alex Joannides | Composer, Musical Director | 2009 | 2 | |
| Jordan, Sverre | Sverre Jordan | Composer, Conductor | 1936 - 1957 | 8 | |
| Jayathilake, Pradeep | Pradeep Jayathilake | Composer | 2006 | 7 | |
| Jordanssen, Leif | Leif Jordanssen | Composer | 2008 | 4 | |
| Jud, Robert | Robert Jud | Composer | 1977 | 1 | |
| Junge, W. | W. Junge | Composer | 1889 | 1 | |
| Janáček, Leoš | Leoš Janáček | Composer | 1994 - 1996 | 3 | |
| Joner, Sverre Indris | Sverre Indris Joner | Composer | 2004 - 2006 | 22 | |
| Jenssen, Geir | Geir Jenssen | Composer | 2010 - 2013 | 5 | |
| Jasenka, Antanas | Antanas Jasenka | Composer | 2012 | 1 | |
| Jæv, Jæwer | Jæwer Jæv | Composer | 2005 - 2006 | 9 | |
| Jiankuan, Liu | Liu Jiankuan | Composer | 2006 - 2010 | 7 | |
| Jirák, Karel, Boleslav | Karel Boleslav Jirák | Composer | 1922 | 1 | |
| Jakša, Lado | Lado Jakša | Composer | 1986 | 1 | |
| John, Aloys | Aloys John | Composer | 1985 | 1 | |
| Jelde, Tassilo | Tassilo Jelde | Composer | 1985 | 1 | |
| James, Bob | Bob James | Composer | 1990 | 1 | |
| Jordan, Chris | Chris Jordan | Composer | 1990 - 1992 | 2 | |
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