The 2015 Idaho State Bengals football team represented Idaho State University as a member of the Big Sky Conference during the 2015 NCAA Division I FCS football season.

Led by fifth-year head coach Mike Kramer, the Bengals compiled an overall record of 2–9 with a mark of 1–7 in conference play, tying for 12th place in the Big Sky.

Idaho State played their home games at Holt Arena in Pocatello, Idaho.