Khonkaen,
Siam Navy and
Sriracha were relegated to the
2012 Thai Division 1 League after finishing the
2011 season in the bottom three places.
2011 Thai Division 1 League champions
Buriram, runners-up
Chainat and third place
BBCU were promoted to the
Thai Premier League. Buriram were to merge with
Buriram PEA at the end of the 2011 campaign to become Buriram United allowing
Wuachon United to take their place in the top flight for the first time.{{cite news |title=Relegation looms on unlucky last day
Stadia and locations Name changes • Thai Port were renamed to Port FC for the start of the season and then renamed back to Thai Port one week later. • Buriram PEA and Buriram merged to become Buriram United • Sisaket were renamed to Esan United for the start of the season. • TTM Phichit were renamed to TTM Chiangmai for the start of the season. • Buriram were renamed to Wuachon United for the start of the season.
Stadium Changes • Muangthong United's stadium would be known as SCG Stadium due to sponsorship reasons. The stadium was previously known as the Yamaha Stadium, again because of sponsorship reasons. The stadium was originally known as the Thunderdome Stadium. • BBCU moved in the Rajamangala Stadium, vacating the Thai Army Sports Stadium that was shared with Army United. However BBCU did use Muangthong United's SCG Stadium for the match with Chiangrai United due to the Rajamangala Stadium being unavailable • TTM Chiangmai moved from the Phichit Stadium to the 700th Anniversary Stadium . • Esan United moved into the Tung Burapha Stadium after relocating into Ubon Ratchathani province. • Wuachon United moved from the I-Mobile Stadium to the Tinasulanon Stadium . • Police United used the
IPE Stadium in Chonburi until the
Thammasat Stadium was ready following floods that also made them use alternative stadiums in the 2011 campaign. A few games were also stage at the Army Stadium in Bangkok. • BEC Tero Sasana hosted Osotspa at the Rajamangala Stadium due to the Thephasadin Stadium being unavailable.
Thai Premier League All-Star Exhibition game ==Personnel and sponsoring==