The 1991 East Texas State Lions football team represented East Texas State University—now known as Texas A&M University–Commerce—as a member of the Lone Star Conference (LSC) during the 1991 NCAA Division II football season.
Led by sixth-year head coach Eddie Vowell, the Lions compiled an overall record of 8–4–1 with a mark of 4–1–1 in conference play, tying for second place in the LSC.
They advanced to the NCAA Division II Football Championship playoffs, where they beat Grand Valley State in the first round before falling to eventual national champion Pittsburg State in the quarterfinals.
East Texas State played their home games at Memorial Stadium in Commerce, Texas.
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