The 2015 Washington State Cougars football team represented Washington State University during the 2015 NCAA Division I FBS football season.

The team was coached by fourth-year head coach Mike Leach and played their home games at Martin Stadium in Pullman, Washington.

They were members of the North Division of the Pac-12 Conference.

[1] They were invited to the Sun Bowl where they defeated the Miami Hurricanes.

Conference opponents not played this season: Utah, USC [2]