Jack McVitie (19 April 1932 – 29 October 1967), best known as Jack the Hat, was an English criminal from London during the 1950s and 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.