The 2018–19 Idaho Vandals men's basketball team represented the University of Idaho in the Big Sky Conference during the 2018–19 NCAA Division I men's basketball season.

Led by eleventh-year head coach Don Verlin, the Vandals played their home games at Cowan Spectrum, with a few early-season games at Memorial Gym, both on campus in Moscow, Idaho.

Idaho lost in the first round of the conference tournament to Montana State.

On June 14, 2019, head coach Don Verlin was fired amid possible NCAA violations.

They lost in the quarterfinals of the Big Sky tournament to Southern Utah.