John Gilmore (September 28, 1931 – August 20, 1995) was an American jazz saxophonist, clarinetist, and percussionist. He was known for his tenure with the avant-garde keyboardist/bandleader Sun Ra from the 1950s to the 1990s, and led The Sun Ra Arkestra from Sun Ra’s death in 1993 until his own death in 1995.

Gilmore was raised in Chicago and played clarinet from the age of 14. He took up the tenor saxophone while serving in the United States Air Force from 1948 through 1951. He then pursued a musical career, beginning as a tenor saxophonist on a national tour with the Harlem Globetrotters in an ensemble that included pianist Earl Hines in 1952.