The 2005 Torneo Descentralizado (known as the Copa Cable Mágico for sponsorship reasons) was the eighty-ninth season of Peruvian football.
Sporting Cristal won its fifteenth Primera División title after beating Cienciano in the season final.
Starting with the 2004 season, the two relegated teams will be able to choose to play in the Segunda División or drop to their regional league as the Segunda División will now be played with non-capital teams.
Deportivo Wanka and Grau–Estudiantes finished the 2004 season in 13th and 14th place, respectively, on the three-season average table and thus were relegated to their regional league.
They were replaced by the champion of the 2004 Copa Perú Sport Áncash.