Leonard A. McEwan (February 17, 1925 – January 24, 2008) was an American jurist who served as chief justice of the Wyoming Supreme Court. McEwan served in the United States Army Air Corps during World War II. He received a B.S. in business and accounting from the University of Wyoming in 1955, followed by a Juris Doctor degree from the UW College of Law in 1957. In January 1975, McEwan stepped down as Chief Justice to become a judge of the Wyoming Fourth Judicial District, following the ouster of judge in a no-confidence vote the previous November.