William J. Lewis (born August 5, 1941) is a former American football player and coach. He served as the head football coach at the University of Wyoming (1977–1979), East Carolina University (1989–1991), and the Georgia Institute of Technology (1992–1994), compiling a career college football record of 45–52–2. Lewis was a defensive assistant at many schools and most notably served as an assistant to Vince Dooley at the University of Georgia, helping win a National Championship in 1980.