The 2015–16 Washington State Cougars men's basketball team represented Washington State University during the 2015–16 NCAA Division I men's basketball season. This was Ernie Kent's second year as head coach at Washington State. The Cougars played their home games at the Beasley Coliseum as members of the Pac-12 Conference. They finished the season 9–22, 1–17 in Pac-12 play to finish in last place. They lost in the first round of the Pac-12 tournament to Colorado.