1986–87 Idaho Vandals men's basketball team

The 1986–87 Idaho Vandals men's basketball team represented the University of Idaho during the 1986–87 NCAA Division I men's basketball season. Members of the Big Sky Conference, the Vandals were led by first-year head coach Tim Floyd and played their home games on campus at the Kibbie Dome in Moscow, Idaho.

The Vandals were 15–13 overall in the regular season and 5–9 in conference play. At the conference tournament in Flagstaff, Arizona, Idaho met third-seed Montana in the first quarterfinal at noon and won by a point, the program's first postseason win in five years. In the semifinal the next night, the Vandals lost to seventh-seed Idaho State, the eventual champion, by nineteen to end the season at 16–14.

Assistants Kermit Davis and Larry Eustachy were both future head coaches of the program.

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