| Year: | 1991 |
| Team: | Western Illinois Leathernecks |
| Sport: | football |
| Conference: | Gateway Collegiate Athletic Conference |
| Short Conf: | Gateway |
| Record: | 7–4–1 |
| Conf Record: | 4–2 |
| Head Coach: | Randy Ball |
| Hc Year: | 2nd |
| Stadium: | Hanson Field |
| Bowl: | NCAA Division I-AA First Round |
| Bowl Result: | L 17–20 vs. Marshall |
The 1991 Western Illinois Leathernecks football team represented Western Illinois University as a member of the Gateway Collegiate Athletic Conference during the 1991 NCAA Division I-AA football season. They were led by second-year head coach Randy Ball and played their home games at Hanson Field. The Leathernecks finished the season with a 7–4–1 record overall and a 4–2 record in conference play. The team received an at-large bid to the NCAA Division I-AA Football Championship playoffs, where they lost to Marshall in the first round.[1]