| Competition: | Primera División |
| Season: | 2004–05 |
| Dates: | 15 August 2004 – 3 July 2005 |
| Continentalcup1: | 2006 Copa Libertadores |
| Continentalcup1 Qualifiers: | Newell's Old Boys Vélez Sársfield River Plate Estudiantes LP Rosario Central |
| Continentalcup2: | 2005 Copa Sudamericana |
| Continentalcup2 Qualifiers: | Newell's Old Boys Vélez Sársfield Estudiantes LP Rosario Central Banfield |
| Matches: | 380 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
The 2004–05 Argentine Primera División was the 114th season of top-flight football in Argentina. The season ran from 15 August 2004 to 3 July 2005.[1]
Four teams promoted from Primera B Nacional, they were Instituto de Córdoba, Almagro (2003–04 Primera B Nacional champions and runners-up, respectively),[2] [3] [4] plus Argentinos Juniors and Huracán de Tres Arroyos (which had won the promotion playoff the previous year).[5]
Newell's Old Boys won the Apertura (5th league title) and Vélez Sársfield won the Clausura (6th title) championships, while Huracán de Tres Arroyos and Almagro were relegated.
| Competition: | Apertura |
| Season: | 2004 |
| Dates: | 13 August – 12 December |
| Winners: | Newell's Old Boys (5th. title) |
| Promoted: | |
| League Topscorer: |  Lisandro López (12) |
| Biggest Home Win: | Boca 6–0 Vélez |
| Biggest Away Win: | GELP 0–3 Arsenal |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
| Rank. | Player | Team | Goals |
|---|---|---|---|
| Lanús | |||
| Emanuel Villa | Rosario Central |
| Competition: | Clausura |
| Season: | 2005 |
| Dates: | 11 February – 3 July |
| Winners: | Vélez Sársfield (6th. title) |
| Relegated: | |
| League Topscorer: | Mariano Pavone (16) |
| Biggest Home Win: | Lanús 6–0 Almagro |
| Biggest Away Win: | Almagro 0–5 Colón |
| Highest Scoring: | Almagro 2–5 River |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
| Rank. | Player | Team | Goals |
|---|---|---|---|
| Gimnasia y Esgrima (LP) | |||
| Instituto (C) |
| width=28 | width=185 | Team | width=50 | width=50 | width=50 | width=50 | width=50 | width=50 | Relegation | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | River Plate | 79 | 66 | 60 | 205 | 114 | ||||||||||
| 2 | Boca Juniors | 79 | 75 | 48 | 202 | 114 | ||||||||||
| 3 | Vélez Sársfield | 66 | 53 | 73 | 192 | 114 | ||||||||||
| 4 | Banfield | 48 | 64 | 59 | 171 | 114 | ||||||||||
| 5 | San Lorenzo | 56 | 62 | 52 | 170 | 114 | ||||||||||
| 6 | Rosario Central | 62 | 44 | 61 | 167 | 114 | ||||||||||
| 7 | Racing | 53 | 50 | 58 | 161 | 114 | ||||||||||
| 8 | Newell's Old Boys | 49 | 51 | 60 | 160 | 114 | ||||||||||
| 9 | Colón | 57 | 49 | 53 | 159 | 114 | ||||||||||
| 10 | Arsenal | 49 | 55 | 54 | 158 | 114 | ||||||||||
| 11 | Quilmes | — | 60 | 44 | 104 | 76 | ||||||||||
| 12 | Independiente | 61 | 44 | 49 | 154 | 114 | ||||||||||
| 13 | Estudiantes (LP) | 43 | 44 | 61 | 148 | 114 | ||||||||||
| 14 | Lanús | 51 | 42 | 54 | 147 | 114 | ||||||||||
| 15 | Gimnasia y Esgrima (LP) | 46 | 38 | 54 | 138 | 114 | ||||||||||
| 16 | Olimpo | 51 | 39 | 43 | 133 | 114 | ||||||||||
| 17 | Argentinos Juniors | — | — | 43 | 43 | 38 | Relegation Playoff Matches | |||||||||
| 18 | Instituto | — | — | 42 | 42 | 38 | ||||||||||
| 19 | Almagro | — | — | 35 | 35 | 38 | Relegated to the Primera B Nacional | |||||||||
| 20 | Huracán (TA) | — | — | 17 | 17 | 38 |