| Year: | 1991 |
| Team: | SMU Mustangs |
| Sport: | football |
| Conference: | Southwest Conference |
| Short Conf: | SWC |
| Record: | 1–10 |
| Conf Record: | 0–8 |
| Head Coach: | Tom Rossley |
| Hc Year: | 1st |
| Off Coach: | Mike Wade |
| Oc Year: | 1st |
| Off Scheme: | Run and shoot |
| Def Coach: | Jon Tenuta |
| Dc Year: | 2nd |
| Def Scheme: | 4–3 |
| Stadium: | Ownby Stadium Cotton Bowl |
The 1991 SMU Mustangs football team represented Southern Methodist University (SMU) as a member of the Southwest Conference (SWC) during the 1991 NCAA Division I-A football season. Led by first-year head coach Tom Rossley, the Mustangs compiled an overall record of 1–10 with a mark of 0–8 in conference play, placing last out of nine teams in the SWC.[1]