The 1989–90 Primeira Divisão was the 56th edition of top flight of Portuguese football.
It started on 20 August 1989 with a match between Chaves and Penafiel, and ended on 20 May 1990.
The league was contested by 18 clubs with Benfica as the defending champions.
Porto qualified for the 1990–91 European Cup first round, Estrela da Amadora qualified for the 1990–91 European Cup Winners' Cup first round, and Benfica, Sporting CP and Vitória de Guimarães qualified for the 1990–91 UEFA Cup first round; in opposite, Portimonense and Feirense were relegated to the Liga de Honra.
Espinho, Fafe, Farense, Leixões and Académico de Viseu were consigned to the Liga de Honra following their final classification in 1988–89 season.