2020 Thai League 3 Lower Region

The 2020 Thai League 3 lower region is a region in the regional stage of the 2020 Thai League 3. A total of twelve teams will compete in the league of the lower region.

Promoted clubs
Two clubs were promoted from the 2020 Thai League 2
 * Nakhon Pathom United
 * Ranong United

Two clubs were promoted from the 2019 Thai League 4
 * Pattani
 * Pathumthani University

Relegated clubs
A club was relegated to the 2020 Thai League 4 Bangkok Metropolitan Region A club was relegated to the 2020 Thai League 4 Southern Region
 * Royal Thai Army
 * Surat Thani

Renamed clubs

 * Banbueng Phuket City was renamed to Banbueng

Top scorers

 * As of 1 March 2020.

Attendance by home match played
Source: Thai League 3