Regional League Southern Region
| Founded | 2009 |
|---|---|
| Folded | 2017 |
| Country | Thailand |
| Number of clubs | 12 |
| Level on pyramid | 3 |
| Promotion to | Regional League Division 2 |
| Domestic cup(s) | Thai FA Cup Thai League Cup |
| Last champions | Surat Thani (2016) |
| Website | http://www.d2.in.th |
| Current: 2016 | |
Regional League South Division is the 3rd Level League in Thailand. It was formed in 2009 along with other four other regional leagues, all playing at the same level. The winner of each regional league enter the Regional League Championships to determine the three teams that will receive promotion to the Thai Division 1 League