Stephen Ailes (May 25, 1912 – June 30, 2001) was a prominent member of the District of Columbia Bar and a partner in the firm of Steptoe & Johnson. He served as the United States Under Secretary of the Army from February 9, 1961, to January 28, 1964, and as United States Secretary of the Army from January 28, 1964, to July 1, 1965. He received his undergraduate education at Princeton University, and attended the law school of West Virginia University, where he was a member of Phi Kappa Psi fraternity.