- Kessner, Daniel, 1946-1
- Kessner, Dolly, 1946-1
- Killmer, Richard1
- Kirkbride, Jerry2
- Kirkpatrick, John, 1905-19913
- Klein, Fred E4
- Knickerbocker Chamber Players2
- Knight, Morris, 1933-20131
- Koch, John, 1928-20141
- Koellreutter, Hans Joachim, 1915-20051
- Kohn, Karl, 1926-1
- Kohon String Quartet5
- Kohon, Harold2
- Komaiko, William4
- Konimsky, Anna1
- Kopulos, Maria1
- Korn, Barbara1
- Korn, Peter Jona1
- Kornacker, Thomas1
- Korte, Karl1
- Kouguell, Alexander6
- Koutzen, George3
- Kozusko, Colette1
- Kraber, Karl5
- Kraft, Jean1
- Kraft, Leo2
- Krause, Susan (Soprano)1
- Kreiselman, Jack5
- Kresky, Jeffrey, 1948-1
- Kriesberg, Matthias1
- Kroeger, Karl1
- Krosnick, Joel1
- 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
- Lateiner, Isidor, 1930-20052
- Laufer, Edward, 1938-20141
- Lavanne, Antonia4
- Lawergren, Bo1
- Lawrence, D. H. (David Herbert), 1885-19301
- Lawton, David1
- Layton, Billy Jim, 1924-20041
- Lazarof, Henri1
- LePage, Pierrette, 1939-1