James Louis Johnson (January 22, 1924 – February 4, 2001) was an American jazz trombonist, composer and arranger. Johnson was one of the earliest trombonists to embrace bebop.

After studying the piano beginning at age 9, Johnson decided to play trombone at the age of 14. In 1941, he began his professional career with Clarence Love, and then played with Snookum Russell in 1942. In Russell’s band he met the trumpeter Fats Navarro, who influenced him to play in the style of the tenor saxophonist Lester Young. Johnson played in Benny Carter‘s orchestra between 1942 and 1945, and made his first recordings in 1942 under Carter’s leadership, recording his first solo (on Love for Sale) in October 1943. In 1944, he took part in the first Jazz at the Philharmonicconcert, presented in Los Angeles and organized by Norman Granz. In 1945 he joined the big band of Count Basie, touring and recording with him until 1946.

While the trombone was featured prominently in dixieland and swing music, it fell out of favor among bebop musicians, largely because instruments with valves and keys (trumpet, saxophone) were believed to be more suited to bebop’s often rapid tempos and demand for technical mastery. In 1946, bebop co-inventor Dizzy Gillespie encouraged the young trombonist’s development with the comment, “I’ve always known that the trombone could be played different, that somebody’d catch on one of these days. Man, you’re elected.” After leaving Basie in 1946 to play in small bebop bands in New York clubs, Johnson toured in 1947 with Illinois Jacquet. During this period he also began recording as a leader of small groups featuring Max Roach, Sonny Stitt and Bud Powell. He performed with Charlie Parker at the 17 December 1947 Dial Records session following Parker’s release from Camarillo State Mental Hospital.