John Richard "Streamline" Ewing (January 19, 1917 in Topeka, Kansas – February 1, 2002) was an American jazz trombonist.

In 1934, Ewing began his career when he was seventeen. Four years later he was with Horace Henderson, then with Earl Hines live and on record from 1938 to 1939 and from 1941 to 1942. He worked for short spans with Louis Armstrong and Lionel Hampton in the 1940s, in addition to Jimmie Lunceford (1943–45), Cab Calloway (1946, 1949), Jay McShann (1948), Cootie Williams (1950), Louis Jordan, and Earl Bostic.

In the early 1950s he moved to California and played with George Jenkins and in the studio with T-Bone Walker and Gerald Wilson. He began playing with Teddy Buckner in 1956; the two would play together on and off into the 1980s. He led his band the Streamliners for recording sessions in 1958 and 1960. In 1962 he toured with Henderson again and with Rex Stewart in 1967. Late in the 1960s he played in the Young Men of New Orleans band.

In 1983 he played with the Eagle Brass Band and recorded with Johnny Otis in 1990. He played on two Willy DeVille albums: Backstreets of Desire (1992) and Big Easy Fantasy (1995).