- Kagen, Sergius
- Kahn, Robert
- Kalbeck, Max
- Kalivoda, Jan
- Kaltneker, Hans
- Kannegießer, Karl Ludwig
- Kapper, Siegfried
- Karg-Elert, Sigfrid
- Karsted
- Kauffmann, Emil
- Kayser, Philipp Christoph
- Keel, Frederick
- Keimann, Christian
- Keller, Gottfried
- Kempff, Wilhelm
- Kerner, Justinus
- Kernochan, Marshall Rutgers
- Kernstock, Ottokar
- Kerr, Alfred
- Key, Francis Scott
- Keymann, Christian
- Kienzl, Wilhelm
- Kilenyi, Edward
- Kind, Johann Friedrich
- King, Betty Jackson
- Kinkel, Gottfried
- Kipling, Rudyard
- Kipper, Heinrich
- Kirlin, June Caldwell
- Kittl, Jan Bedrich
- Kjerulf, Halfdan
- Kleffel, Arno
- Klein, Bruno Oscar
- Klemperer, Otto
- Klenke, Karoline Louise von
- Kletke, Hermann
- Klingemann, Karl
- Klingenfeld, Emma
- Klingermann, Karl
- Klingsor, Tristan
- Klopstock, Friedrich Gottlieb
- Knab, Armin
- Knapp, Immanuel Friedrich
- Koch, Ernst
- Koczalski, Raoul
- Koechlin, Charles
- Königswinter, Wolfgang Müller von
- Kopisch, August
- Korbay, Francis Alexander
- Körner, Karl Julius
- Körner, Karl Theodor
- Korngold, Erich Wolfgang
- Kosegarten, Ludwig Gotthard
- Kosma, Joseph
- Kramer, A. Walter
- Kreutzer, Conradin
- Kreuz, Emil
- Kücken, Friedrich Wilhelm
- Kuffner, Christoph
- Kugler, Franz Theodor
- Kuh, Emil
- Kuhlau, Daniel Friedrich Rudolph
- Kulemann, Rudolf
- Kulmann, Elisabeth
