Komponisten der Gegenwart (KDG) J-Kd
- Jacobi, Wolfgang
- Jägermeier, Otto
- Jaggi, Martin
- Jahn, Thomas
- Jakubėnas, Vladas
- Janáček, Leoš
- Jarnach, Philipp
- Jarrell, Michael
- Jelinek, Hanns
- Jentzsch, Wilfried
- Ježek, Jaroslav
- Jian-Er, Zhu
- Johansson, Sven-Ake
- Johnson, Evan
- Johnson, Tom
- Jolivet, André
- Jost, Christian
- Julius, Rolf
- Jung, Helge
- Juozapaitis, Jurgis
- Kabalevskij, Dmitrij
- Kabeláč, Miloslav
- Kagel, Mauricio
- Kahn, Erich Itor
- Kahn, Robert
- Kaipainen, Jouni
- Kalitzke, Johannes
- Kalninš, Imants
- Kalsons, Romualds
- Kampe, Gordon
- Kangro, Raimo
- Kang, Sukhi
- Kantscheli, Gija
- Kapr, Jan
- Karaev, Faradž
- Karger, Reinhard
- Karkoschka, Erhard
- Kats-Chernin, Elena
- Katzer, Georg
- Kaufmann, Dieter
- Kaul, Matthias
- Kazandžiev, Vasil