The 2015 Western Illinois Leathernecks football team represented Western Illinois University in the 2015 NCAA Division I FCS football season. They were led by third year head coach Bob Nielson and played their home games at Hanson Field. They were a member of the Missouri Valley Football Conference. They finished the season 7–6, 5–3 in MVFC play to finish in a three way tie for third place. They received an at-large bid to the FCS playoffs where they defeated Dayton in the first round before losing in the second round to fellow MVFC member Illinois State.