Michael Holt Newlin (May 16, 1926 – August 9, 2021) was an American diplomat who served as the United States Ambassador to Algeria. A career Foreign Service officer, he was nominated by Ronald Reagan in August 1981, and served from October 28, 1981 until July 21, 1985. He was also the Representative of the U.S.A. to the Vienna Office of the United Nations from August 12, 1988 until September 6, 1991.