The 1991 Boise State Broncos football team represented Boise State University in the 1991 NCAA Division I-AA football season.

The Broncos competed in the Big Sky Conference and played their home games on campus at Bronco Stadium in Boise, Idaho.

The Broncos were led by fifth-year head coach Skip Hall, Boise State finished the season 7–4 overall and 4–4 in conference.

The Broncos won all of their home games, and lost the rest.

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