The 1991 Tippeligaen was the 47th completed season of top division football in Norway. 22 game-weeks were played with 3 points given for wins and 1 for draws. Number eleven and twelve are relegated. The winners of the two groups of the 1. divisjon are promoted, as well as the winner of a series of play-off matches between the two second placed teams in the two groups of the 1. divisjon and number ten in the Tippeligaen.
The season began on 27 April 1991. The season ended on 13 October 1991, with Viking claiming their eighth league title. Viking were thus the last club to win the league before Rosenborg's 13-year domination started.
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Brann, Bryne, and Strindheim played play-offs, Brann won and remained in Tippeligaen.