The 2002–03 Primeira Liga was the 69th edition of top flight of Portuguese football.
It started on 25 August 2002 with a match between Varzim and Paços de Ferreira, and ended on 1 June 2003.
In opposite, Varzim, Santa Clara and Vitória de Setúbal were relegated to the Segunda Liga.
Salgueiros, Farense and Alverca, were consigned to the Segunda Liga following their final classification in 2001–02 season.
The other three teams were replaced by Moreirense, Académica and Nacional from the Segunda Liga.