| 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 | |
| Joplin, Scott | Scott Joplin | Composer | 1994 | 1 | |
| Johansson, Stefan | Stefan Johansson | Composer | 2014 - 2015 | 44 | 1 |
| Jíra, Milan | Milan Jíra | Composer | 1979 - 2000 | 3 | |
| Jörissen, Rainer | Rainer Jörissen | Composer | 1997 - 2007 | 4 | |
| Jedlièka, Václav | Václav Jedlièka | Composer | 2012 | 1 | |
| Jonsson, Helén | Helén Jonsson | Composer | 2002 - 2003 | 3 | |
| Jóhannsson, Jóhann | Jóhann Jóhannsson | Composer | 2003 | 1 | |
| Jones, Dan | Dan Jones | Composer | 2004 - 2012 | 2 | 1 |
| Jíra, Vítek | Vítek Jíra | Composer | 2006 | 1 | |
| Johnson, Lee | Lee Johnson | Composer | 2005 | 3 | |
| Jelescu, Dan | Dan Jelescu | Composer | 1963 | 1 | |
| Jacques, Sylvain | Sylvain Jacques | Composer | 2006 - 2007 | 2 | |
| Jerez, Sergio Murillo | Sergio Murillo Jerez | Composer | 2008 - 2009 | 4 | |
| Janssen, Richard | Richard Janssen | Composer | 2008 - 2009 | 2 | |
| Jóhannsson, Barði | Barði Jóhannsson | Composer | 2011 | 1 | |
| Jones, Grace | Grace Jones | Composer | 2011 | 1 | |
| Józsa, Tamás | Tamás Józsa | Composer | 2016 | 1 | |
| Jarnefelt, Edvard, Armas | Edvard Armas Jarnefelt | Composer | 1936 | 1 | |
| Jans, Alaric | Alaric Jans | Composer | 1978 | 1 | 1 |
| Judson, Arnold | Arnold Judson | Composer | 1964 | 1 | |
| Joseph, Cuinn | Cuinn Joseph | Composer | 2019 | 1 | |
| Janssønn, Jakob | Jakob Janssønn | Composer | 2019 | 1 | |
| Janette Walen, Niels | Niels Janette Walen | Composer | 1976 | 1 | |
| Joseph, Kathryn | Kathryn Joseph | Composer | 2021 | 5 | |
| Johnson, Laurie | Laurie Johnson | Composer | 1975 | 1 | |
| Jocov, Christo | Christo Jocov (Христо Йоцов) | Composer | 2022 | 1 | |
| Jordan, Sverre | Sverre Jordan | Composer, Conductor | 1936 - 1957 | 8 | |
| Joannides, Alex | Alex Joannides | Composer, Musical Director | 2009 | 2 | |
| Johannesen, Terje | Terje Johannesen | Composer, Musician | 2002 - 2016 | 11 | 1 |
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