John Stanley Marshall (28 August 1941 – 16 September 2023) was an English drummer and founding member of the jazz rock band Nucleus. From 1972 to 1978, he was the drummer for Soft Machine, replacing Phil Howard when he joined.

Marshall was born in Isleworth, Middlesex on 28 August 1941, and worked with various jazz and rock bands and musicians, among them J. J. Jackson, Allan Holdsworth, Barney Kessel, Alexis Korner, Graham Collier, Michael Gibbs, Arthur Brown, Keith Tippett, Centipede, Jack Bruce, John McLaughlin, Dick Morrissey, Hugh Hopper, Elton Dean, John Surman, Charlie Mariano, John Abercrombie, Arild Andersen, and Eberhard Weber's Colours.

From 1999, he worked with former Soft Machine co-musicians in several Soft Machine-related projects like SoftWare, SoftWorks and Soft Machine Legacy. He toured as a member of the band, which operated under the name Soft Machine again, from 2015 to 2023.

Marshall died on 16 September 2023, at the age of 82.

With Jack Bruce

With John Surman

With Vassilis Tsabropoulos

With others