The 2018–19 UNLV Runnin' Rebels basketball team represented the University of Nevada, Las Vegas during the 2018–19 NCAA Division I men's basketball season. The Runnin' Rebels were led by third-year head coach Marvin Menzies and played their home games at the Thomas & Mack Center in Paradise, Nevada as members of the Mountain West Conference. They finished the season 17–14, 11–7 in Mountain West play to finish in a tie for fourth place. They lost in the quarterfinals of the Mountain West tournament to San Diego State.