The 1990-91 Division 1 season was the 27th of the competition of the first-tier football in Senegal.
The tournament was organized by the Senegalese Football Federation.
[1] ASC Port Autonome won the second title and participated in the 1992 African Cup of Champions Clubs the following year.
The season featured 450 matches and scored 429 goals.
The league was contested by 14 teams with ASC Port Autonome winning the championship.