Jack D McVitie (1932, Battersea, London – 29 October 1967, Stoke Newington, London), more commonly known as Jack the Hat, was a notorious English criminal from London of the 1950s – 1960s. He is posthumously famous for triggering the imprisonment and downfall of the Kray twins. He had acted as an enforcer and hitman with links to "the firm", and was murdered by Reggie Kray in 1967.