John Symon Asher "Jack" Bruce (born May 14, 1943) is a Scottish musician; a multi-instumentalist, composer, singer. He is most well known as a very influential electric bassist, especially when he was a member of seminal rock band Cream.

In the early 60s, Bruce played double bass with Graham bond in the Graham Bond Organisation, which played a mixture of jazz, blues, and R&B. It was at this time that he met drummer Ginger Baker. After stints with John Mayall and Manfred Mann, he formed Cream with Baker and guitarist Eric Clapton. Cream had numerous hits during its existence, most of them written by Bruce with lyricist Pete Brown.

In the years since Cream's breakup in 1968, Bruce has released a number of solo albums, mostly in a more experimental vein, and worked with a wide variety of musicians in many genres. The list includes Robin Trower, Tony Williams, John McLaughlin, Carla Bley, Allan Holdsworth, Ringo Starr and Frank Zappa. He was also a member of the band West, Bruce And Laing.