John Symon Asher "Jack" Bruce (14 May 1943 – 25 October 2014) was a Scottish musician and composer, known primarily as a member of the British rock trio Cream.

Bruce maintained a solo career that spanned several decades and also played in several musical groups. Although particularly famous for his work as a vocalist, bass guitarist and songwriter, he also played double bass, harmonica, piano and cello. He was trained as a classical cellist and considered himself a jazz musician, although much of his catalogue of compositions and recordings tended toward blues and rock and roll. The Sunday Times said that "many consider him to be one of the greatest bass players of all time."