Earl of Stockton is a title in the peerage of the United Kingdom. It was created on 24 February 1984 for Harold Macmillan, the former Conservative prime minister (from 1957 to 1963), less than three years before his death in 1986. At the same time a courtesy title was conferred for the earl's heir apparent: Viscount Macmillan of Ovenden, of Chelwood Gate in the County of East Sussex and of Stockton-on-Tees in the County of Cleveland. The family seat was Birch Grove, near Chelwood Gate, East Sussex, but it was sold by the 2nd Earl in 1989.