William Francis "Bo" Ryan, Jr. (born December 20, 1947) is an American basketball coach and former player. He is the current head coach of the University of Wisconsin–Madison Badgers men's basketball team, a position he has held since 2001. Ryan served as the head men's basketball coach at the University of Wisconsin–Platteville from 1984 to 1999 and at the University of Wisconsin–Milwaukee from 1999 to 2001.