2008 Campeonato Nacional Primera División

The 2008 Primera División de Chile is the 77th season of top-flight football in Chile, and the 7th under its current format.

Torneo Apertura

The Torneo Apertura "Copa BancoEstado" opened the 2008 season on January 25. The 20 teams were organized into four groups, but played each other in a single round-robin format. The top-two teams from each group advanced to a single elimination play-off, but the best 3rd-place team had to worst 2nd-place team in an advancement play-off match. The winner of the tournament will be crowned the Apertura champion, and will earn a spot in the 2009 Copa Libertadores Group Stage. The champion and runner-up with earn spots in the 2008 Copa Sudamericana.

Torneo Clausura

The Torneo Clausura "Copa BancoEstado" began on June 21. The format is the same as the Apertura tournament, but the field was reduced from 20 teams to 19 since Deportes Concepción withdrew before the start of the tournament due to financial problems. The best-placed team in the first stage earned a spot in the First Stage of the 2009 Copa Libertadores. The tournament champion will earn a spot in the 2009 Copa Libertadores Group Stage. Relegation will be determined at the end of this tournament.

Relegation

Four teams were relegated this year to reduce the field for next season to 18 teams.

Aggregate table

The aggregate table is only a sum of the two first-stages from the Apertura and Clausura tournaments. The bottom-two teams are relegated from the results of this table.

Relegation table

The next two teams to be relegated were determined through a special aggregate table for the 2007 & 2008 season. The teams' performances were put under a specific formula and then ranked. The two worst teams who have not been relegated by this season's aggregate table were relegated.

In the case of Rangers, Provincial Osorno, and Santiago Morning, the following formula was used since they were not in the Primera División in the 2007 season:

In both formulas, P_d is the relegation average; P₂₀₀₇ is the total points earned in the 2007 season; P_Ap-2008 is the points earned in this season's Apertura tournament; P_Cl-2008 is the points earned in this season's Clausura tournament.

Pos	Team	P_desc	P₂₀₀₇	P_{Ap 2008}	P_{Cl 2008}
1	Universidad Católica	70,37	30,40	21,60	18,37
2	Audax Italiano	70,18	34,58	20,40	15,20
3	Colo-Colo	69,78	32,68	16,20	20,90
4	Universidad de Chile	68,67	26,60	18,00	24,07
5	O'Higgins	62,51	23,18	21,60	17,73
6	Huachipato	58,00	24,70	16,20	16,10
7	Santiago Morning	57,44	0,00	30,00	27,44
8	Ñublense	57,41	22,04	24,60	10,77
9	Cobresal	56,22	24,32	18,60	13,30
10	Cobreloa	55,98	25,08	13,80	16,10
11	Rangers	55,67	0,00	24,00	31,67
12	Palestino	53,92	18,62	14,40	19,90
13	Everton	51,75	14,82	19,20	17,73
14	La Serena	50,94	18,24	15,60	17,10
15	Unión Española	47,33	17,10	14,40	15,83
16	Universidad de Concepción	45,66	19,76	12,60	13,30
17	Antofagasta	42,63	17,86	10,20	14,57
18	Melipilla	33,87	20,90	6,00	6,97
19	Provincial Osorno	26,56	0,00	16,00	10,56

	Relegated by the Relegation Table
	Already relegated by the [\|Aggregate Table]

Relegation/promotion play-off

The 15th & 16th place team in the aggregate table have to play two promotion/relegation matches the Segunda División runner-up and the winner of the Segunda División Apertura/Clausura play-off. The winners will play in the Primera División the next season.