Leslie William Buck (30 May 1915 – 23 December 1984) was a British trade unionist.
Buck grew up in Middlesex and attended Willesden County Grammar School.
He completed an apprenticeship as a panel beater, and joined the National Union of Sheet Metal Workers and Braziers.
[1] Buck gradually rose to prominence in the Sheet Metal Workers, becoming a district officer in 1957, then district secretary in 1960, and general secretary of the union in 1962.
[1] In 1973, the Electrical, Electronic, Telecommunications and Plumbing Union opened talks with the Sheet Metal Workers regarding a possible merger, and in exchange offered Buck the post of general secretary, but the merger did not go ahead.