The 1991 NCAA Division I-AA football season, part of college football in the United States organized by the National Collegiate Athletic Association at the Division I-AA level, began in August 1991, and concluded with the 1991 NCAA Division I-AA Football Championship Game on December 21, 1991, at Paulson Stadium in Statesboro, Georgia. The Youngstown State Penguins won their first I-AA championship, defeating the Marshall Thundering Herd by a score of 25−17.