1991 BYU Cougars football team

The 1991 BYU Cougars football team represented Brigham Young University as a member of the Western Athletic Conference (WAC) during the 1991 NCAA Division I-A football season. Led by 20th-year head coach LaVell Edwards, the Cougars compiled a record of 8–3–2 overall and 7–0–1 in conference play, winning the WAC title for the third consecutive season. BYU was invited to the Holiday Bowl, where the Cougars tied Iowa.

Awards and honors

 * Ty Detmer – Davey O'Brien Award, Consensus First-team All-American, 3rd in Heisman Trophy voting