1983–84 Idaho Vandals men's basketball team

The 1983–84 Idaho Vandals men's basketball team represented the University of Idaho during the 1983–84 NCAA Division I men's basketball season. Members of the Big Sky Conference, the Vandals were led by first-year head coach Bill Trumbo and played their home games on campus at the Kibbie Dome in Moscow, Idaho.

The Vandals were 9–18 overall in the regular season and 4–10 in conference play; after four consecutive years in the top half of the standings (with two titles), Idaho returned to last place in the Big Sky. The conference tournament previously included only the top four teams; it was expanded this year to include all eight. The quarterfinals were at campus sites on Tuesday, and eighth-seeded Idaho fell to league champion Weber State.

Two Inland Empire winning streaks ended this season: after three straight wins over Washington State in the Battle of the Palouse, the Cougars beat the Vandals by thirteen points in Pullman in December. Gonzaga broke a four-game losing streak to Idaho with a seven-point win in Moscow in January; it was senior point guard John Stockton's sole win in the series.

No Vandals were named to the all-conference team; senior center Pete Prigge was honorable mention. Two years earlier as a sophomore, he was the sixth man on the successful 1982 team.

Hired in early April, Trumbo was previously the head coach at Santa Rosa Junior College in northern California; he succeeded alumnus Don Monson, who departed after five seasons for Oregon of the Pac-10 Conference.

Roster

 * Source

Postseason result
!colspan=6 style=| Big Sky tournament