| Country: | Argentina |
| Season: | 2005–06 |
| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
The 2005–06 Argentine First Division Apertura was a nail biter. After a head-to-head finish in the last weeks Boca Juniors took the trophy home. Gimnasia de La Plata will have to wait for their first-ever championship. The 2005–06 Argentine First Division Clausura saw Boca Juniors become the first team since River Plate in 1999–2000 to win the Apertura and the Clausura in the same season. This capped an amazing year for Boca, as they won every tournament they were eligible (they were not eligible for the Copa Libertadores after a dismal Clausura last season). Lanús were the big surprise of the Clausura, as they finished second in the league. Boca also achieved 80 points in a season for the first time since 1998/99 when they scored 89 points.
Argentina drew one of the most difficult groups in the 2006 FIFA World Cup, advanced to the second round but lost against hosts Germany in the quarter-finals.
After an abysmal season, Instituto and Tiro Federal were relegated to the Nacional B Division a few weeks before the end of the tournament. The next two worst teams in the relegation standings, Argentinos Juniors and Olimpo de Bahía Blanca, played a Promoción playoff (home and away) series against Huracán and Belgrano de Córdoba, respectively, for two spots in next year's Argentine First Division. Argentinos Juniors remains in the top category after drawing with Huracán twice. Olimpo, however, were relegated to Nacional B after losing twice to Belgrano.
| Position | Team | Points | Played | Won | Drawn | Lost | For | Against | Difference | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 40 | 19 | 12 | 4 | 3 | 36 | 17 | 19 | ||
| 2 | Gimnasia de La Plata | 37 | 19 | 11 | 4 | 4 | 28 | 19 | 9 | |
| 3 | Vélez Sársfield | 33 | 19 | 10 | 3 | 6 | 26 | 16 | 10 | |
| 4 | Independiente | 32 | 19 | 8 | 8 | 3 | 34 | 22 | 12 | |
| 5 | Banfield | 28 | 19 | 5 | 13 | 1 | 25 | 15 | 10 | |
| 6 | River Plate | 28 | 19 | 8 | 4 | 7 | 31 | 22 | 9 | |
| 7 | 28 | 19 | 8 | 4 | 7 | 23 | 22 | 1 | ||
| 8 | Argentinos Juniors | 28 | 19 | 8 | 4 | 7 | 19 | 20 | -1 | |
| 9 | San Lorenzo | 28 | 19 | 8 | 4 | 7 | 33 | 39 | -6 | |
| 10 | 26 | 19 | 7 | 5 | 7 | 28 | 27 | 1 | ||
| 11 | Racing Club | 25 | 19 | 7 | 4 | 8 | 28 | 27 | 1 | |
| 12 | Olimpo de Bahía Blanca | 23 | 19 | 5 | 8 | 6 | 19 | 23 | -4 | |
| 13 | Lanús | 23 | 19 | 5 | 8 | 6 | 21 | 31 | -10 | |
| 14 | 22 | 19 | 5 | 7 | 7 | 23 | 24 | -1 | ||
| 15 | Rosario Central | 22 | 19 | 5 | 7 | 7 | 20 | 29 | -9 | |
| 16 | 20 | 19 | 5 | 5 | 9 | 25 | 27 | -2 | ||
| 17 | Quilmes | 19 | 19 | 4 | 7 | 8 | 20 | 27 | -7 | |
| 18 | Gimnasia de Jujuy | 18 | 19 | 3 | 9 | 7 | 23 | 30 | -7 | |
| 19 | Tiro Federal | 15 | 19 | 4 | 3 | 12 | 22 | 31 | -9 | |
| 20 | Instituto | 15 | 19 | 2 | 9 | 8 | 11 | 27 | -16 |
There is no relegation after the Apertura. For the relegation results of this tournament see below.
| Position | Team | Points | Played | Won | Drawn | Lost | For | Against | Difference | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 43 | 19 | 13 | 4 | 2 | 37 | 14 | 23 | ||
| 2 | Lanús | 35 | 19 | 10 | 5 | 4 | 26 | 15 | 11 | |
| 3 | 34 | 19 | 9 | 7 | 3 | 39 | 24 | 15 | ||
| 4 | Gimnasia de Jujuy | 33 | 19 | 10 | 3 | 6 | 26 | 16 | 10 | |
| 5 | Gimnasia de La Plata | 32 | 19 | 9 | 5 | 5 | 31 | 22 | 9 | |
| 6 | Newell's Old Boys | 31 | 19 | 8 | 7 | 4 | 27 | 18 | 9 | |
| 7 | Banfield | 31 | 19 | 10 | 1 | 8 | 28 | 22 | 6 | |
| 8 | San Lorenzo | 28 | 19 | 7 | 7 | 5 | 15 | 14 | 1 | |
| 9 | Olimpo | 26 | 19 | 7 | 5 | 7 | 22 | 22 | 0 | |
| 10 | Vélez Sársfield | 25 | 19 | 5 | 10 | 4 | 21 | 18 | 3 | |
| 11 | 24 | 19 | 6 | 6 | 7 | 25 | 31 | -6 | ||
| 12 | Independiente | 23 | 19 | 6 | 5 | 8 | 18 | 18 | 0 | |
| 13 | Rosario Central | 23 | 19 | 5 | 8 | 6 | 15 | 17 | -2 | |
| 14 | 22 | 19 | 5 | 7 | 7 | 26 | 28 | -2 | ||
| 15 | Arsenal de Sarandí | 22 | 19 | 5 | 7 | 7 | 17 | 20 | -3 | |
| 16 | 20 | 19 | 5 | 5 | 9 | 19 | 26 | -7 | ||
| 17 | Quilmes | 20 | 19 | 5 | 5 | 9 | 11 | 28 | -17 | |
| 18 | Racing Club | 19 | 19 | 5 | 4 | 10 | 14 | 24 | -10 | |
| 19 | Instituto | 13 | 19 | 3 | 4 | 12 | 16 | 37 | -21 | |
| 20 | 12 | 19 | 3 | 3 | 13 | 15 | 39 | -24 |
| Team | Average | Points | Played | 2003-04 | 2004-05 | 2005-06 | |
|---|---|---|---|---|---|---|---|
| Boca Juniors | 1.807 | 206 | 114 | 75/38 | 48/38 | 83/37 | |
| River Plate | 1.649 | 188 | 114 | 66/38 | 60/38 | 62/37 | |
| 1.614 | 184 | 114 | 53/38 | 73/38 | 58/38 | ||
| Banfield | 1.596 | 182 | 114 | 64/38 | 59/38 | 59/38 | |
| San Lorenzo | 1.491 | 170 | 114 | 62/38 | 52/38 | 56/38 | |
| Newell's Old Boys | 1.421 | 162 | 114 | 51/38 | 60/38 | 51/38 | |
| Gimnasia de La Plata | 1.412 | 161 | 114 | 38/38 | 54/38 | 69/38 | |
| Estudiantes de La Plata | 1.377 | 157 | 114 | 44/38 | 61/38 | 52/38 | |
| Lanús | 1.351 | 154 | 114 | 42/38 | 54/38 | 58/38 | |
| Arsenal de Sarandí | 1.342 | 153 | 114 | 55/38 | 54/38 | 43/38 | |
| Gimnasia de Jujuy | 1.342 | 51 | 38 | N/A | N/A | 51/38 | |
| Racing Club | 1.333 | 152 | 114 | 50/38 | 58/38 | 44/38 | |
| Rosario Central | 1.316 | 150 | 114 | 44/38 | 61/38 | 45/38 | |
| Independiente | 1.298 | 148 | 114 | 44/38 | 49/38 | 55/38 | |
| Colón de Santa Fe | 1.298 | 148 | 114 | 49/38 | 53/38 | 46/38 | |
| Quilmes | 1.265 | 143 | 114 | 60/38 | 44/38 | 39/38 | |
| Argentinos Juniors | 1.224 | 93 | 76 | N/A | 43/38 | 50/38 | |
| Olimpo de Bahía Blanca | 1.149 | 131 | 114 | 39/38 | 43/38 | 49/38 | |
| Instituto | 0.921 | 70 | 76 | N/A | 42/38 | 28/38 | |
| Tiro Federal | 0.711 | 27 | 38 | N/A | N/A | 27/38 |
Argentinos Juniors remains in the Argentine First Division after a 3 - 3 aggregate tie by virtue of a "sports advantage". In case of a tie in goals, the team from the First Division gets to stay in it.
Belgrano de Córdoba wins 4-2 and is promoted to Argentine First Division. Olimpo de Bahia Blanca is relegated to the Argentine Nacional B.
| width=20% | Level | width=40% | Tournament | width=40% | Champion |
|---|---|---|---|---|---|
| 2nd | Godoy Cruz Nueva Chicago | ||||
| 3rd | Platense | ||||
| 3rd (Interior) | Villa Mitre | ||||
| 4th | Deportivo Merlo | ||||
| 5th | Ituzaingó | ||||
| width= 20% | Team / Competition | width= 20% | 2005 Recopa Sudamericana | width= 20% | 2005 Copa Sudamericana | width= 20% | 2006 Copa Libertadores |
|---|---|---|---|---|---|---|---|
| Boca Juniors | Champions defeated  Once Caldas | Champions defeated  UNAM | did not qualify | ||||
| Vélez Sársfield | did not play | Semifinal eliminated by UNAM | Quarterfinals eliminated by Guadalajara | ||||
| Estudiantes de La Plata | did not play | First stage eliminated by  Banfield | Quarterfinals eliminated by  São Paulo | ||||
| River Plate | did not play | Round of 16 eliminated by Corinthians | Quarterfinals eliminated by Libertad | ||||
| Newell's Old Boys | did not play | First stage eliminated by Rosario Central | Round of 16 eliminated by Vélez Sársfield | ||||
| Rosario Central | did not play | Round of 16 eliminated by Internacional | Group Stage eliminated (finished last in the group) |
This section covers Argentina's matches from August 1, 2005, to July 31, 2006.
See main article: 2006 FIFA World Cup qualification (CONMEBOL).
See main article: 2006 FIFA World Cup.
See also: 2006 FIFA World Cup Group C and 2006 FIFA World Cup knockout stage.