William Francis "Bo" Ryan Jr. (born December 20, 1947) is an American former college basketball coach and player. He was the head coach of the University of Wisconsin–Madison Badgers men's basketball team from 2001 to December 2015. 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. On December 15, 2015, Ryan announced his retirement, effective immediately.
