The 2008 Thai Premier League had 16 teams. It was the twelfth since its establishment. The first matches of the season were played on 18 February 2008, and the season ended on 11 October 2008. Three teams would be relegated to Thailand Division 1 League. The Champion in this season would qualify for the AFC Champions League 2009 qualification stage and the runner-up would be enter the AFC Cup 2009. The official name of the league at this time was Thailand Premier League.
Provincial Electricity Authority won their first championship after they changed their home stadium from Bangkok to Ayutthaya, where they have a bigger fan base. This season also saw the great successful team of Thai football league, Bangkok Bank relegated to Division 1 league after they were defeated by Chonburi in the final match of the season.
Defending champions Chonburi were pipped to the title after faltering against new Premier League side Samut Songkhram in the second to last game of the season. Samut finished in a creditable 7th place, one place above Chula United who also impressed in their first season back in the top flight.
Customs Department FC, the other newcomers along with, found life to difficult and dropped back into Division One at the first attempt.
Rules
Teams play each other twice on a home and away basis
3 Points for a win
1 Point for a draw
At end of the season the winners play the runners ups in the Kor Royal Cup
Winner qualifies for Asian Champions League Qualification Round
Runner-Up enters AFC Cup
Teams finishing on same points at the end of the season use head-to-head record to determine finishing position. Bottom three teams are relegated to Thailand Division 1 League
Member clubs
Bangkok Bank
Bangkok University
BEC Tero Sasana
Chonburi
Chula-Sinthana † (promoted from Division 1 Winner Group B) Coke-Bangpra (promoted from Division 1 Runner Up Group A) Customs Department (promoted from Division 1 Winner Group A) Krung Thai Bank Nakhon Pathom Osotsapa M-150 Port Authority of Thailand PEA Royal Thai Army Samut Songkhram (promoted from Division 1 Runner Up Group B) Thailand Tobacco Monopoly TOT