The 2015–16 Wisconsin Badgers men's basketball team represented the University of Wisconsin–Madison in the 2015–16 NCAA Division I men's basketball season. This was Bo Ryan's 15th season as head coach at Wisconsin, before he resigned 12 games into the season. On December 15, 2015, Ryan announced he would retire effective immediately leaving associate head coach Greg Gard as interim head coach. The team played their home games at the Kohl Center and were members of the Big Ten Conference. They finished the season 22–13, 12–6 in Big Ten play to finish in a four-way tie for third place in conference. Shortly after the regular season, Greg Gard had the interim tag removed as he was announced as the permanent head coach. The Badgers were upset by Nebraska in the second round of the Big Ten tournament. They received an at-large bid to the NCAA tournament, their 18th straight appearance in the Tournament. They defeated Pittsburgh and Xavier to advance to the Sweet Sixteen for the third consecutive year. In the Sweet Sixteen, they lost to Notre Dame.

William Francis "Bo" Ryan Jr. is an American former college basketball coach. He was the head coach of the Wisconsin Badgers men's basketball team of the University of Wisconsin–Madison 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. His overall collegiate coaching record was 747–233. Ryan was inducted into the College Basketball Hall of Fame in 2017.