The 1988–89 Idaho Vandals men's basketball team represented the University of Idaho during the 1988–89 NCAA Division I men's basketball season. Members of the Big Sky Conference, the Vandals were led by first-year head coach Kermit Davis and played their home games on campus at the Kibbie Dome in Moscow, Idaho. Seeded thirteenth in the West region, Idaho met fourth-seed #15 UNLV back in Boise and lost by twelve.