The 2019–20 Illinois State Redbirds men's basketball team represented Illinois State University during the 2019–20 NCAA Division I men's basketball season. The Redbirds, led by eighth-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 10–21, 5–13 in conference play to finish in ninth place. They lost in the opening round of the MVC tournament as the number nine seed to Drake.