The 2015 Northwestern State Demons football team represented Northwestern State University as a member of the Southland Conference during the 2015 NCAA Division I FCS football season. Led by third-year head coach Jay Thomas, the Demons compiled an overall record of 4–7 with a mark of 4–5 in conference play, placing in a three-way tie for fifth in the Southland. Northwestern State played home games at Harry Turpin Stadium in Natchitoches, Louisiana.