| Year: | 1991 |
| Team: | Youngstown State Penguins |
| Sport: | football |
| Conference: | Independent |
| Record: | 12–3 |
| Head Coach: | Jim Tressel |
| Hc Year: | 6th |
| Off Coach: | Don Treadwell |
| Oc Year: | 1st as OC, 6th overall |
| Stadium: | Stambaugh Stadium |
| Champion: | NCAA Division I-AA champion |
| Bowl: | NCAA Division I-AA Championship Game |
| Bowl Result: | W 25–17 vs. Marshall |
The 1991 Youngstown State Penguins football team represented Youngstown State University in the 1991 NCAA Division I-AA football season. The Penguins were led by sixth-year head coach Jim Tressel and played their home games at Stambaugh Stadium. They finished the season 12–3. They received an at-large bid to the I-AA playoffs, where they defeated Villanova, Nevada, and Samford to advance to the National Championship Game, where they defeated Marshall. This was their first national championship in school history.