- Kneisel, Marianne1
- Knickerbocker Chamber Players2
- Knight, Felix1
- Knight, Gladys, 1944-1
- Knight, Morris, 1933-20131
- Koch, John, 1928-20141
- Kodály, Zoltán, 1882-19674
- Koellreutter, Hans Joachim, 1915-20051
- Kohn, Karl, 1926-1
- Kohon String Quartet5
- Kohon, Harold7
- Komaiko, William4
- Komatsu, Chosei1
- Konimsky, Anna1
- Konitz, Lee1
- Kopetz-Korf, Ada, 1919-20203
- Kopulos, Maria1
- Korn, Barbara1
- Korn, Peter Jona1
- Korn, Richard, 1908-19811
- Kornacker, Thomas1
- Korte, Karl1
- Koshak, John1
- Kouguell, Alexander6
- Koussevitzky, Serge, 1874-19512
- Koutzen, George3
- Kozusko, Colette1
- Kraber, Karl5
- Kraft, Jean1
- Kraft, Leo3
- Kraft, Marie Simmelink, 1900-19671
- Krause, Susan (Soprano)1
- Kreiselman, Jack5
- Krenek, Ernst, 1900-19911
- Kresky, Jeffrey, 1948-1
- Kriesberg, Matthias1
- Kroeger, Karl1
- Krosnick, Joel1
- Krupp, David1
- Kubera, Joseph2
- Kuboyama, Aikichi1
- Kuderna, Jerome1
- Kunz, Gerald1
- Kupferman, Meyer, 1926-20031
- Kupferman, Theodore1
- Kurka, Robert, 1921-19571
- Kushner, Eugene, 1923-20031
- Kuskin, Charles1
- La Barbara, Joan, 1947-1
- La Montaine, John1
- LaPorta, John2
- Laderman, Ezra2
- Lamoree, Valarie6
- Lancaster, Lisa1
- Lancman, Deborah1
- Laneri, Roberto, 1945-1
- Lanza, Alcides1
- Lark Woodwind Quintet1
- Lash, Warren1
- Laske, Otto E. (Otto Ernst), 1936-1