- Kagel, Mauricio
- Kai, Jin
- Kalichstein-Laredo-Robinson Trio
- Kambeitz, Niklas
- Kamjoo, Saeed
- Kammerensemble Neue Musik Berlin
- Kämper, Rudolf
- Kang, Eyvind
- Kangoro, V Kineya
- Kappeler, Beat
- Károlyi, Pál
- Katcho, Line
- Kawamura, Koyo
- Kazandjiev, Vassil
- Kearney, Patrick
- Kelemen, Milko
- Keller, Géraldine
- Kelley, Russell
- Kelterborn, Rudolf
- Kendergi, Maryvonne
- Kennedy, Kathy
- Kentros, George
- Keren, Jonathan
- Kern, Margit
- Khachaturian, Aram
- Khoury-Ghata, Vénus
- Kim, Sean
- Kim, Yubin
- Kinner, Adam
- Klanac, Petar-Kresimir
- Klangforum Wien
- Klatzow, Peter
- Klause, Carolyn
- Klaxon Gueule
- Klefstad, Jeffrey
- Klein, Julian
- Klein, Julieanne
- Kleine, Lorenzo
- Klimbo
- Klughardt, August
- Knudson, Elizabeth Joanna
- Koch, Henry
- Koene, J Peter
- Koering, René
- Koh, Min-Jeong
- Kohn, Amy
- Kölner Ensemble für Neues Musiktheater
- Komorous, Rudolf
- Kondo, Fusako
- Kondo, Jo
- Kontarsky, Alfons
- Kontarsky, Aloys
- Koprowski, Peter Paul
- Korde, Shirish
- Koshkin, Nikita
- Kotoński, Włodzimierz
- Kourliandski, Dmitri
- Kourliandsky, Dimitri
- Koyohide, Yoshizumi
- Kradjian, Serouj
- Kramer, Eliazer
- Krasnyanskaya, Irina
- Krauze, Zygmunt
- Krenek, Ernst
- Kristin, Joy
- Kröll, Georg
- Kucharzyk, Henry
- Kulish, Taras
- Kunst, Jos
- Kunz, Jean-Willy
- Kuo, Lynn
- Kuo, William
- Kuroki, Maya
- Kurtág, György
- Kurtz, Eugène
- Kutavicius, Bronius
- Kutter, Markus
