Harold Millington (24 April 1875 – 25 October 1951) was an Australian politician. He was a Labor Party member of the Parliament of Western Australia; as a member of the Legislative Council for North-East Province for six years from 1914, and as a member of the Legislative Assembly from 1924 to 1947, representing the electorates of Leederville (1924–1930) and Mount Hawthorn (1930–1947). He was a long-serving state minister in the governments of Philip Collier and John Willcock, and was Deputy Premier under Willcock.