Paul Laurence Dunbar Chambers Jr. was an American jazz double bassist. A fixture of rhythm sections during the 1950s and 1960s, he has become one of the most widely-known jazz bassists of the hard bop era. He was also known for his bowed solos. Chambers recorded about a dozen albums as a leader or co-leader, and over 100 more as a sideman, especially as the anchor of trumpeter Miles Davis's "first great quintet" (1955–63) and with pianist Wynton Kelly (1963–68).

Hard bop is a subgenre of jazz that is an extension of bebop music. Journalists and record companies began using the term in the mid-1950s to describe a new current within jazz that incorporated influences from rhythm and blues, gospel music, and blues, especially in saxophone and piano playing.