2005 Torneo Descentralizado
The 2005 Torneo Descentralizado was the eighty-ninth season of Peruvian football. A total of 12 teams competed in the tournament. Sporting Cristal won its fifteenth Primera División title after beating Cienciano in the season final. The season started on March 5, 2005, ended on December 21, 2005.
Changes from 2004
Structural changes
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. The number of first division teams dropped from 14 to 13.Promotion and relegation
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.Teams
| Team | City | Stadium | Capacity | Field |
| Alianza Atlético | Sullana | Campeones del 36 | 8,000 | Grass |
| Alianza Lima | Lima | Alejandro Villanueva | 35,000 | Grass |
| Atlético Universidad | Arequipa | Virgen de Chapi | 45,000 | Grass |
| Cienciano | Cusco | Garcilaso | 42,056 | Grass |
| Coronel Bolognesi | Tacna | Jorge Basadre | 19,850 | Grass |
| Melgar | Arequipa | Mariano Melgar | 20,000 | Grass |
| Sport Áncash | Huaraz | Rosas Pampa | 8,000 | Grass |
| Sport Boys | Callao | Miguel Grau | 15,000 | Grass |
| Sporting Cristal | Lima | San Martín de Porres | 18,000 | Grass |
| Unión Huaral | Huaral | Julio Lores Colan | 10,000 | Grass |
| Universidad César Vallejo | Trujillo | Mansiche | 24,000 | Artificial |
| Universidad San Martín | Lima | Nacional | 18,000 | Grass |
| Universitario | Lima | Monumental | 80,093 | Grass |
Relegation table
Updated as of games played on December, 2005.Top scorers
;18 goals;17 goals
;16 goals
;15 goals
- Hernán Rengifo ''''