The team represented Pittsburg State University as a member of the Missouri Athletic Association (MIAA) during the 1991 NCAA Division II football season.
In their second season under head coach Chuck Broyles, the Gorillas compiled a 13–1–1 record (8–0–1 against conference opponents), won the MIAA championship, and outscored opponents by a total of 555 to 226.
[1][2][3] They qualified to participate in the Division II playoffs and advanced to the national championship game, defeating Jacksonville State by a 23–6 score.
[5] The season was the 84th for Pittsburg State competing in football and its second as a member of NCAA Division II after moving from NAIA.
The team played its home games in at Carnie Smith Stadium in Pittsburg, Kansas.