| Season: | 2004 |
| Dates: | 28 February 2004 – 29 December 2004 |
| Winners: | Alianza Lima 21st Primera División title |
| League Topscorer: | Gabriel Garcia (35) |
| Nextseason: | 2005 |
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 number of teams for the 2004 season grew from 12 to 14. The relegation system was re-introduced but the system was determined by a points per match average. The qualification for the Copa Sudamericana was determined by the aggregate table instead of the Torneo Apertura playoffs. Due to a structure change in the Copa Libertadores, only two teams will qualify directly to the group stage (the half-year champions) and the best-placed non-champion will have to play in the first stage.
No teams were relegated from the 2003 season and thus the number of teams grew from 12 to 14. Segunda División champion Sport Coopsol and Copa Perú 2003 champion Universidad César Vallejo were promoted.
Universidad San Martín bought the promotional place of the 2003 Segunda División winners, Sport Coopsol.
| 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 | ||||
| 25,000 | Grass | ||||
| 20,000 | 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 | Relegation | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Alianza Lima | 80 | 99 | 179 | 89 | |||||||||
| 2 | Sporting Cristal | 76 | 95 | 171 | 89 | |||||||||
| 3 | Cienciano | 49 | 101 | 150 | 88 | |||||||||
| 4 | Alianza Atlético | 58 | 92 | 150 | 89 | |||||||||
| 5 | Universitario | 41 | 84 | 125 | 89 | |||||||||
| 6 | Unión Huaral | 50 | 75 | 125 | 89 | |||||||||
| 7 | Sport Boys | 58 | 62 | 120 | 89 | |||||||||
| 8 | Coronel Bolognesi | 60 | 60 | 120 | 89 | |||||||||
| 9 | Universidad César Vallejo | — | 63 | 63 | 52 | |||||||||
| 10 | Melgar | 44 | 62 | 106 | 89 | |||||||||
| 11 | Universidad San Martín | — | 57 | 57 | 52 | |||||||||
| 12 | Atlético Universidad | 33 | 57 | 90 | 88 | |||||||||
| 13 | Deportivo Wanka | 32 | 50 | 82 | 89 | |||||||||
| 14 | Grau–Estudiantes | 27 | 43 | 60 | 89 |
| Rank | Scorer | Club | Goals |
|---|---|---|---|
| 1 | Gabriel Garcia | Melgar | 35 |
| 2 |  Johan Fano | Coronel Bolognesi | 29 |
| 3 |  Luis Alberto Bonnet | Sporting Cristal | 28 |
| 4 | Sergio Ibarra | Cienciano | 25 |
| 5 | Pedro García | Alianza Atlético | 23 |
| 6 | Sebastian Dominguez | Atlético Universidad | 21 |
| 7 | Hernán Rengifo | Unión Huaral | 18 |
| 8 | Miguel Mostto | Cienciano | 17 |
| Junior Ross | Coronel Bolognesi | 17 |