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
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 |
Torneo Apertura
Torneo Clausura
Final
Aggregate table
Relegation table
| Team | |||||||
| 1 | Sporting Cristal | 76 | 95 | 88 | 259 | 137 | ' |
| 2 | Alianza Lima | 80 | 99 | 64 | 243 | 137 | ' |
| 3 | Cienciano | 49 | 101 | 84 | 234 | 136 | ' |
| 4 | Universitario | 41 | 84 | 88 | 213 | 137 | ' |
| 5 | Alianza Atlético | 58 | 92 | 49 | 202 | 137 | ' |
| 6 | Coronel Bolognesi | 60 | 60 | 79 | 198 | 137 | ' |
| 7 | Sport Áncash | — | — | 66 | 66 | 48 | ' |
| 8 | Universidad San Martín | — | 57 | 79 | 136 | 100 | ' |
| 9 | Sport Boys | 58 | 62 | 59 | 185 | 137 | ' |
| 10 | Melgar | 44 | 62 | 59 | 169 | 137 | ' |
| 11 | Unión Huaral | 50 | 75 | 37 | 168 | 137 | ' |
| 12 | Universidad César Vallejo | — | 63 | 44 | 106 | 100 | ' |
| 13 | Atlético Universidad | 33 | 57 | 54 | 143 | 136 |
Updated as of games played on December, 2005.
| Relegated to the 2006 Segunda División |
Top scorers
;18 goals;17 goals
;16 goals
;15 goals