John Middleton Campbell, Baron Campbell of Eskan, known familiarly as "Jock", was a British businessman and entrepreneur, who the Chairman of Booker Brothers, McConnell and Co in British Guiana between 1952 and 1967. He was knighted in 1957 and was created a Labour Party life peer on 14 January 1966, taking the title Baron Campbell of Eskan, of Camis Eskan in the County of Dumbarton. He was Chairman of the Commonwealth Sugar Exporters Association (1950–84). He was additionally notable as chairman of Booker McConnell, Chairman of the New Statesman and Nation and the first chairman of the Milton Keynes Development Corporation.

Booker Group Limited is a British wholesale distributor, and subsidiary of Tesco.