| Season: | 2005 |
| Dates: | 5 March 2005 – 21 December 2005 |
| Winners: | Sporting Cristal 15th Primera División title |
| League Topscorer: | Miguel Mostto (18) |
| Nextseason: | 2006 |
The 2005 Torneo Descentralizado (known as the Copa Cable Mágico for sponsorship reasons) 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.
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.
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.
| Team | City | Stadium | Capacity | Field | |
|---|---|---|---|---|---|
| Campeones del 36 | 8,000 | Grass | |||
| Alejandro Villanueva | 35,000 | Grass | |||
| 45,000 | Grass | ||||
| 42,056 | Grass | ||||
| 19,850 | Grass | ||||
| 20,000 | Grass | ||||
| 8,000 | Grass | ||||
| 15,000 | Grass | ||||
| 18,000 | Grass | ||||
| 10,000 | Grass | ||||
| 24,000 | Artificial | ||||
| 18,000 | Grass | ||||
| Monumental | 80,093 | Grass |
| width=28 | width=185 | Team | width=50 | width=50 | width=50 | width=50 | width=50 | width=50 | Relegation | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |