John Ellwood Madill (15 January 1915 – 5 December 1999) was a Progressive Conservative party member of the House of Commons of Canada. He was born in Melancthon, Ontario. From 1952 to 1957, he was a municipal councillor for Mono Township, subsequently its deputy reeve to 1959, then reeve from that point until 1963. In 1962, he was warden of Dufferin County. Besides his insurance practice, Madill was also a businessman and farmer during his career.