2011 Thai League Division 1 is the 14th 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.
League expansion
It was announced at the end of the 2010 season that the TPL would increase the number of teams for the start of the 2011 Thai Premier League season. Therefore, playoff games were arranged to promote more teams for the Regional League Division 2 and relegate less teams from the TPL. During these games, Nakhon Pathom were banned and therefore will fail to take their place in Division 1 for the next two seasons. This did mean that the league would only feature 17 teams for the season, but with less than 3 weeks before the start of the league campaign another round of playoffs was used to promote one more side, Saraburi.
Changes from last season
Team changes
From Division 1
Promoted to Thai Premier League
Sriracha
Khonkaen
Chiangrai United
Relegated to Regional League Division 2
Prachinburi
Narathiwat
To Division 1
Relegated from Thai Premier League
Bangkok United
Promoted from Regional League Division 2
Buriram
F.C. Phuket
Chiangmai
Chainat
Rangsit University JW
Bangkok
Saraburi
Clubs serving bans
Nakhon Pathom - 2 years
Teams
Stadia and locations
Name changes
Suvarnabhumi Customs were renamed Samut Prakan Customs United. Raj Pracha Nonthaburi were renamed Raj Pracha F.C. Thailand Chula United were renamed BBCU (Big Bang Chulalongkorn University) Rangsit University JW were renamed J.W. Rangsit PTT were renamed PTT Rayong
Ground changes
Chanthaburi moved from the Chanthaburi Stadium to the Rambhai Barni Rajabhat University Stadium BBCU withdrew from the Chulalongkorn University Stadium after an internal dispute which also formed the new RL club Jamjuree United and ground shared with TPL side Army United at the Thai Army Sports Stadium Thai Honda moved from the KMITL Sport center football stadium to the Chalermprakiet 72 Sports Center stadium.