The 1989 Idaho Vandals football team represented the University of Idaho in the 1989 NCAA Division I-AA football season. The Vandals, led by first-year head coach John L. Smith, were members of the Big Sky Conference and played their home games at the Kibbie Dome, an indoor facility on campus in Moscow, Idaho. The Vandals won their third consecutive conference title (fourth in five years), and made the I-AA playoffs for the fifth consecutive season, under a third head coach. Led by senior All-American quarterback John Friesz, Idaho finished the regular season at 9–2 and 8–0 in the Big Sky.