- Knott, Albert Edward (1867-)
- Knott, Graham (1934-)
- Knott, Herbert
- Knott, Joshua R.
- Knott, Percival Alexander (1905-)
- Knott, William A. Percival (1884-)
- Knowleden, Arthur
- Knowles, Charles Edgar (1887-)
- Knox, William Robert (1861-1933)
- Knüller, Andreas (1649-1724)
- Knuth, Friedrich
- Knutzén, Ingvar (1932-)
- Knyght, Thomas
- Knyvett, Charles (1752-1822)
- Knyvett, Charles (1773-1852)
- Kobbé, G.
- Kobelt, Johann (1877-1973)
- Kobrich, Johann Anton (1714-1791)
- Koch, C. J. E.
- Koch, Casper P.
- Koch, Dagfinn (1964-)
- Koch, Elfriede (1899-1975)
- Koch, Erland von (1910-)
- Koch, Friedrich Ernst (1862-1927)
- Koch, Heinz (1916-)
- Koch, Herman Ernst (1885-1963)
- Koch, Johannes Hermann Ernst (1918-)
- Koch, Karl (1887-1971)
- Koch, Markus (1879-1948)
- Koch, Matthäus (1862-1933)
- Koch, Matthew
- Koch, Paul E.
- Koch, Sigurd Christian Erland von (1910-)
- Köckert, Carl (1840-)
- Kodály, Dr Zoltán (1882-1967)
- Kodama, Mari (1940-)
- Koechlin, Charles Louis Eugène (1867-1950)
- Koehne, Graeme John (1956-)
- Koelewijn, Bert (1953-)
- Koenen, Friedrich (1829-1887)
- Koenig, Fidèle (1848-)
- Koerppen, Alfred (1926-)
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- Koert, Han van (1913-1976)
- Koetsier, Jan (1911-)
- Kofler, Leo (1837-1908)
- Kofroń, Petr (1955-)
- Kögler, Walter
- Kohl, Leopold
- Kohlenberg, Oliver (1951-)
- Kohler, Alois (1867-c1907)
- Köhler, Ernst (1799-1847)
- Köhler, Karl (1919-)
- Köhler, Wolfgang (1923-)
- Köhler-Wumbach, Wilhelm (1858-1926)
- Kohlmann, Clarence (1891-1944)
- Kohn, Karl George (1926-)
- Kohoutek, Ctirad (1929-)
- Kohs, Ellis Bonoff (1916-2000)
- Kokkonen, Joonas (1921-1996)
- Kolander, Keith (1955-)
- Kolb, Barbara (1939-)
- Kolb, Karlmann (Carlmann) (1703-1765)
- Kolberg, Kåre (1936-)
- Kolessa, Nicolai Filaretovich (1904-)
- Kolinski, Mieczysalv (1901-1981)
- Kolk, Eric van der (1959-)
- Kollmann, August Friedrich Karl (Carl) (1756-1829)
- Kollmann, George August (1789-1845)
- Kollontay, Mikhail Georgievich (1952-)
- Kolman, Peter (1937-)
- Kolodub, Zhanna Efimovna (1930-)
- Koloss, István (1932-)
- Komarnitski, Oleg Mikhailovich (1946-1998)
- Komma, Kark Michael (1913-)
- Kondo, Jo (1947-)
- Konietzny, Heinrich (1910-1983)
- König, August (1829-)
- König, Ludwig
- König, Peter (1870-1940)
- König, Vincenz (1748-1804)
- Königslöw, Johann Wilheim Cornelius von (1745-1833)
- Königsperger, Johann Erhard Marianus (1708-1769)
- Kont, Paul (1920-2000)
- Kontor, Elek
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Organist 
Organist & composer 
Composer 
Organ builder 
Other
