The 1986 Western Illinois Leathernecks football team represented Western Illinois University as a member of the Gateway Collegiate Athletic Conference (GCAC) during the 1986 NCAA Division I-AA football season. Led by fourth-year head coach Bruce Craddock, the Leathernecks compiled an overall record of 6–5, with a mark of 2–4 in conference play, and finished fifth in the GCAC. The Leathernecks were led by senior All-American center Frank Winters, senior All- American defensive lineman Todd Auer, and sophomore quarterback Paul Singer, who was 6 -2 as the starter and led the Leathernecks in passing for the second consecutive season. All - conference receiver Albert Brown led the Leathernecks in receiving yards.