- Kagen, Sergius
- Kahn, Robert
- Kalivoda, Jan
- Karg-Elert, Sigfrid
- Kauffmann, Emil
- Kayser, Philipp Christoph
- Keel, Frederick
- Kempff, Wilhelm
- Kernochan, Marshall Rutgers
- Kienzl, Wilhelm
- Kilenyi, Edward
- King, Betty Jackson
- Kirlin, June Caldwell
- Kittl, Jan Bedrich
- Kjerulf, Halfdan
- Kleffel, Arno
- Klein, Bruno Oscar
- Klemperer, Otto
- Knab, Armin
- Knapp, Immanuel Friedrich
- Koczalski, Raoul
- Koechlin, Charles
- Korbay, Francis Alexander
- Korngold, Erich Wolfgang
- Kosma, Joseph
- Kramer, A. Walter
- Kreutzer, Conradin
- Kreuz, Emil
- Kücken, Friedrich Wilhelm
- Kuhlau, Daniel Friedrich Rudolph
