The 1991 Australian Football League finals series was the 95th annual edition of the VFL/AFL final series, the Australian rules football play-off tournament staged to determine the winner of the 1991 AFL Premiership season. The series ran over four weekends in September 1991, culminating with the 1991 AFL Grand Final at AFL Park on 28 September 1991.
The McIntyre final five system, which had operated from 1972 until 1990, was replaced by the first McIntyre final six system. The following season, it was replaced by the second McIntyre final six system.