In 1991, the league welcomed four new franchises: the Columbus Chill, Dayton Bombers, Raleigh Icecaps, and Toledo Storm.
The fifteen teams played 64 games in the schedule.
The Toledo Storm finished first overall in the regular season.
The Hampton Roads Admirals won their second straight Riley Cup championship.
Note: GP = Games played, W = Wins, L = Losses, T = Ties, Pts = Points, GF = Goals for, GA = Goals against, Green shade = Clinched playoff spot, Blue shade = Clinched division