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.