The 2017–18 Illinois Fighting Illini men's basketball team represented the University of Illinois at Urbana–Champaign in the 2017–18 NCAA Division I men's basketball season. Led by first-year head coach Brad Underwood, the Illini played their home games at State Farm Center in Champaign, Illinois as members of the Big Ten Conference. They finished the season 14–18, 4–14 in Big Ten play to finish in a three-way tie for 11th place. As the No. 13 seed in the Big Ten tournament, they lost in the first round to Iowa.