Marvin Lester Kay (February 17, 1939 – April 19, 2023) was an American college football coach. He was the head football coach and athletic director for the Colorado School of Mines, holding the position of head football coach from 1969 to 1994 and athletic director from 1995 to 2004. He played college football for Colorado Mines as a lineman.
Kay served in the United States Army as a lieutenant from April 1964 to April 1966. He was also the 43rd mayor of Golden, Colorado, from 1988 to 1996. Colorado Mines football stadium was dedicated to Kay in 2015.