1999 Thai Premier League

The 1999 Thai Premier League consisted of 12 teams. The bottom club would be relegated to the Thailand Division 1 League. The club that came 11th would play in a relegation / promotion match against the club that came second in the Thailand Division 1 League Defending Champions Sinthana would enter the next edition of the Asian Club Championship. The league was also known as the Caltex Premier League.

1999 Thai Premier League

The 1999 Thai Premier League consisted of 12 teams. The bottom club would be relegated to the Thailand Division 1 League. The club that came 11th would play in a relegation / promotion match against the club that came second in the Thailand Division 1 League Defending Champions Sinthana would enter the next edition of the Asian Club Championship. The league was also known as the Caltex Premier League.