The 2012 Regional League Division 2 (also known as the AIS Regional League Division 2 for sponsorship reasons) was contested by the five regional league winners and runners up of the 3rd level championships of Thailand. The two best 3rd placed teams from the regional leagues also take part

Twelve teams were split into two groups of A & B, with the top two teams from group A & B gaining promotion to the Yamaha League-1 for the 2013 campaign, along with this, the two group winners would play off to determine the overall champions.

red Zone:2012 Regional League Division 2 Bangkok Metropolitan Region
Yellow Zone:2012 Regional League Division 2 Central & Eastern Region
Green Zone: 2012 Regional League Division 2 Northern Region Region
Orange Zone:2012 Regional League Division 2 North Eastern Region
Blue Zone:2012 Regional League Division 2 Southern Region

Last updated December 9, 2012

The Regional Division 2 2012 winners were Ayutthaya.