Guy Vernon Lewis II (March 19, 1922 – November 26, 2015) was an American basketball player and coach. He served as the head men's basketball coach at the University of Houston from 1956 to 1986. Lewis led his Houston Cougars to five appearances in the Final Four of the NCAA Tournament, in 1967, 1968, 1982, 1983, and 1984. His 1980s teams, nicknamed Phi Slama Jama for their slam dunks, were runners-up for the national championship in back-to-back seasons in 1983 and 1984. He was inducted into National Collegiate Basketball Hall of Fame in 2007 and the Naismith Memorial Basketball Hall of Fame in 2013.