The 2004 Torneo Descentralizado (known as the Copa Cable Mágico for sponsorship reasons) was the eighty-eighth season of Peruvian football.
A total of 14 teams competed in the tournament, with Alianza Lima as the defending champion.
Alianza Lima won its twenty-first Primera División title after beating Sporting Cristal in the final playoff.
The qualification for the Copa Sudamericana was determined by the aggregate table instead of the Torneo Apertura playoffs.
Universidad San Martín bought the promotional place of the 2003 Segunda División winners, Sport Coopsol.