1989–90 Idaho Vandals men's basketball team

1989–90 Idaho Vandals men's basketball
ConferenceBig Sky Conference
Record25–6 (13–3 Big Sky)
Head coach
Assistant coachSteve Barnes (2nd season)
Home arenaKibbie Dome
1989–90 Big Sky men's basketball standings
Conf.Overall
TeamW L PCTW L PCT
Idaho133 .813256  .806
Eastern Washington115 .6881811  .621
Montana106 .6251811  .621
Nevada97 .5631513  .536
Weber State88 .5001415  .483
Montana State88 .5001712  .586
Boise State79 .4381215  .444
Northern Arizona313 .188820  .286
Idaho State313 .188621  .222
Conference tournament winner

The 1989–90 Idaho Vandals men's basketball team represented the University of Idaho during the 1989–90 NCAA Division I men's basketball season. Members of the Big Sky Conference, the Vandals were led by second-year head coach Kermit Davis and played their home games on campus at the Kibbie Dome in Moscow, Idaho.

The Vandals were 23–5 overall in the regular season and 13–3 in conference play, champions in the regular season standings. At the conference tournament in Boise, the Vandals earned a third consecutive bye into the semifinals, where they beat sixth seed Montana State by nine points. In the final against league runner-up Eastern Washington, Idaho's Ricardo Boyd sank a three-pointer as time expired to break a tie and give the Vandals a second consecutive NCAA berth.

Seeded thirteenth again in the West Regional, Idaho lost to Louisville by nineteen points in Salt Lake City in the first round. Davis left in late March for Texas A&M, and was succeeded by Larry Eustachy, a former fellow UI assistant in Tim Floyd's first season (1986–87).

This was Idaho's fourth appearance in the NCAA tournament in ten years, but remains its most recent.