2012 Thai Division 1 League

2012 Thai League Division 1 (known as Yamaha League 1 for sponsorship reasons) is the 15th 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.

From Division 1
Promoted to 2012 Thai Premier League
 * BBCU
 * Buriram (later renamed Wuachon United and re-located from Buriram Province to Songkhla Province)
 * Chainat

Relegated to Regional League Division 2
 * Chiangmai
 * RBAC Mittraphap
 * Samut Prakan Customs United
 * Thai Honda

To Division 1
Relegated from Thai Premier League Promoted from Regional League Division 2
 * Khonkaen
 * Siam Navy
 * Sriracha
 * Krabi
 * Nakhon Ratchasima
 * Phattalung
 * Ratchaburi