The 2018–19 Idaho Vandals women's basketball team represented the University of Idaho during the 2018–19 NCAA Division I women's basketball season.

The Vandals, led by eleventh year head coach Jon Newlee, played their home games at the Cowan Spectrum with early season games at Memorial Gym, and were members of the Big Sky Conference.

They finished the season 22–12, 16–4 in Big Sky play to win the Big Sky regular season championship.

They advanced to the semifinals of the Big Sky women's tournament, where they lost to Portland State.

They received an automatic bid to the Women's National Invitation Tournament, where they defeated Loyola Marymount and Denver in the first and second rounds before losing to Arizona in the third round.