Raymond Matthews Brown (October 13, 1926 – July 2, 2002 Pittsburg, PA) was an American jazz double bassist, known for his extensive work with Oscar Peterson and Ella Fitzgerald. He was also a founding member of the group that would later develop into the Modern Jazz Quartet.

As a young man Brown became increasingly well known in the Pittsburgh jazz scene, with his first experiences playing in bands with the Jimmy Hinsley Sextet and the Snookum Russell band. Later, having heard stories about the burgeoning jazz scene on 52nd Street in New York City, he bought a one-way ticket to New York. He arrived in New York at the age of 20, met up with Hank Jones, with whom he had previously worked, and was introduced to Dizzy Gillespie, who was looking for a bass player. Gillespie hired Brown on the spot, and he soon played with such established musicians as Art Tatum and Charlie Parker. In 1948, Brown left Dizzy’s band to start a trio with Hank Jones and Charlie Smith.

From 1946 to 1951, Brown played in Gillespie’s band. Brown, along with the vibraphonist Milt Jackson, drummer Kenny Clarke, and pianist John Lewis formed the rhythm section of the Gillespie band. Lewis, Clarke, and Jackson eventually formed the Modern Jazz Quartet. Brown became acquainted with singer Ella Fitzgerald when she joined the Gillespie band as a special attraction for a tour of the southern United States in 1947. The two married that year, and together they adopted a child born to Fitzgerald’s half-sister Frances, whom they christened Ray Brown, Jr. Fitzgerald and Brown divorced in 1953, bowing to the various career pressures both were experiencing at the time, though they would continue to perform together.