- Jolson, Al, 1886-1950 (composer)1
- Joplin, Scott, 1868-1917 (composer)1
- Kassel, Art, 1896-1965 (composer/lyricist)1
- Keel, Frederick, 1871-1954 (composer)1
- Kenbrovin, Jaan (composer/lyricist)1
- Kendis, James, 1883-1946 (composer/lyricist)1
- King, Charles E. (Charles Edward), 1874-1950 (composer/lyricist)1
- King, Irving (composer/lyricist)1
- Koehler, Ted, 1894-1973 (composer/lyricist)1
- Kálmán, Emmerich, 1882-1953 (composer)1
- La Forge, Frank, 1879-1953 (composer)1
- Lampe, J. B. (Jens Bodewalt), 1869-1929 (composer)1
- Lax, Arnold T. (composer)1
- Lehár, Franz, 1870-1948 (composer)1
- Leopold, J. Walter, 1890-1956 (composer)1
- Levey, Harold, 1894-1967 (composer)1
- Liddle, Samuel, 1868-1935? (composer)1
- Lincke, Paul, 1866-1946 (composer)1
- Little, George A., 1890-1946 (composer/lyricist)1
- Lo?hr, Hermann, 1871-1943 (composer)1