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The 1991 NAIA Division I football season was the 36th season of college football sponsored by the NAIA, was the 22nd season of play of the NAIA's top division for football.
The Central Arkansas Bears defeated the Central State Marauders, the defending national champions, in the Champion Bowl, 19–16, to win their third NAIA national title. It was the Bears' first non-shared national title.
Conference changes
This is the final season that the NAIA officially recognizes a football champion from the South Atlantic Conference. The SAC, and its eight members, would become an NCAADivision II conference by the 1993 season.
^ – NAIA Division I playoff participant West Virginia Tech forfeited four victories, including two conference wins, over Fairmont State and West Virginia Wesleyan.