2013 Thai League Division 1 (known as Yamaha League 1 for sponsorship reasons) is the 16th season of the League since its establishment in 1997. It is the feeder league for the Thai Premier League. A total of 18 teams will compete in the league this season.
Promoted to Thai Premier League
Relegated to Regional League Division 2
Relegated from Thai Premier League
Promoted from Regional League Division 2
<small>Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.</small>
The number of foreign players is restricted to seven per DIV1 team, including a slot for a player from AFC countries. A team can use four foreign players on the field in each game, including at least one player from the AFC country.
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The Coach of the Year was awarded to Narasak Boonkleng.
The Golden Boot was awarded to Leandro de Oliveira da Luz.