James Minter Knepper (November 22, 1927 – June 14, 2003) was an American jazz trombonist. In addition to his own recordings as leader, Knepper performed and recorded with Charlie Barnet, Woody Herman, Claude Thornhill, Stan Kenton, Benny Goodman, Gil Evans, Thad Jones and Mel Lewis, Toshiko Akiyoshi and Lew Tabackin, and, most famously, Charles Mingus in the late 1950s and early 1960s. Knepper died in 2003 of complications of Parkinson's disease.

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