The 2018–19 Idaho Vandals men's basketball team represented the University of Idaho during the 2018–19 NCAA Division I men's basketball season. The Vandals, led by eleventh-year head coach Don Verlin, played their home games at the Cowan Spectrum, with a few early season games at Memorial Gym, in Moscow, Idaho as members of the Big Sky Conference. They finished the season 5–27, 2–18 in Big Sky play to finish in last place. They lost in the first round of the Big Sky tournament to Montana State.