The 1991–92 Primeira Divisão was the 58th edition of top flight of Portuguese football. It started on 18 August 1991 with a match between Desp. Chaves and Estoril, and ended on 16 May 1992. The league was contested by 18 clubs with Benfica as the defending champions.
Tirsense, Vitória de Setúbal, Estrela da Amadora, Belenenses and Nacional were consigned to the Liga de Honra following their final classification in 1990-91 season where five teams were relegated due to the reduction of teams.