The 2015–16 Illinois State Redbirds men's basketball team represented Illinois State University during the 2015–16 NCAA Division I men's basketball season. The Redbirds, led by fourth-year head coach Dan Muller, played their home games at Redbird Arena in Normal, Illinois as a member of the Missouri Valley Conference. They finished the season 18–14, 12–6 in conference play, to finish in a tie for second place. As the number three seed in the MVC tournament, they were defeated by Indiana State in their quarterfinal game.