John A. "Peck" Morrison (September 11, 1919 – February 25, 1988) was an American jazz bassist.
Morrison was classically trained, and was competent on trumpet and percussion in addition to bass. He played in military bands in Italy during World War II and moved to New York City after the war to play professionally. He played with Lucky Thompson in the early 1950s, and then recorded with Horace Silver, Gigi Gryce, and Art Farmer. He played with Gerry Mulligan in tours of Europe. He was a noted accompanist and sideman, playing with Carmen McRae, Tiny Bradshaw, King Pleasure, Zoot Sims, Eddie Jefferson, the J. J. Johnson/Kai Winding Quintet (1954), Duke Ellington (1955 and 1964), Lou Donaldson, Johnny Smith, Mal Waldron, Randy Weston, Babs Gonzales, the Newport Rebels (1960), Shirley Scott, Red Garland, Charles McPherson, and Sy Oliver and the Harlem Blues and Jazz Band (1986).
Morrison never recorded as a session leader.