Alexander Daniel Alan Macmillan, 2nd Earl of Stockton, styled as Viscount Macmillan of Ovenden between 1984 and 1986, is a Conservative Party politician in the United Kingdom. He is the eldest son of the Conservative politician Maurice Macmillan and grandson of prime minister Harold Macmillan, 1st Earl of Stockton.

Maurice Victor Macmillan, Viscount Macmillan of Ovenden,, was a British Conservative Party politician and Member of Parliament. He was the only son of Harold Macmillan, 1st Earl of Stockton, who was Prime Minister of the United Kingdom from 1957 to 1963.