John Reginald Crocker (born 19 October 1937, in West Bridgford, Nottinghamshire, England)^[1] was the English leading clarinet and saxophone player for the Chris Barber jazz band for just over 30 years, before retiring in February 2003.

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In addition to his band work, Crocker also played with musician Elton John, contributing clarinet to "Big Dipper" and tenor saxophone on "Shooting Star" for John's 1978 album, A Single Man.^[2] Since retiring Crocker has guested with several bands including Kenny Ball and a Ken Colyer tribute band.^{[citation needed]}