The Western Illinois Leathernecks men's basketball team represents Western Illinois University of Macomb, Illinois, in National Collegiate Athletic Association Division I men's college basketball competition. The school's team currently competes in The Summit League.
Western Illinois' first men's basketball team was fielded in 1910–1911. The Leathernecks men's basketball program made the transition from Division II to Division I beginning in the 1981–82 season. They were selected to play in the College Basketball Invitational tournament following the 2011–12 regular season, the first Division I postseason appearance in school history. The Leathernecks were selected again to play in the College Basketball Invitational tournament after the 2012–13 season.