Football clubs in the Thai League 1 compete in the AFC Champions League annually. This details the participation and performances in the competition since its based at 2002 as a result of the merger between the Asian Club Championship, the Asian Cup Winners' Cup and the Asian Super Cup.
Participations.
1 PEA FC and TTM FC qualified for 2006 AFC Champions League group stage, but were later disqualified because of failing to fill in their player registration forms in time. ;br ;
2 Club no longer exists.