2017 Thai League 3
The 2017 Thai League 3 football season will be the first season of Thai League 3. 29 clubs will be divided into 2 groups.
Clubs
Upper Region
Promoted from 2016 Regional League Division 2 Northern DivisionPromoted from 2016 Regional League Division 2 North-Eastern Region
Promoted from 2016 Regional League Division 2 Eastern Region
Promoted from 2016 Regional League Division 2 Central Region
Lower Region
Promoted from 2016 Regional League Division 2 Bangkok & field RegionPromoted from 2016 Regional League Division 2 Bangkok & Eastern Region
Promoted from 2016 Regional League Division 2 Western Region
Promoted from 2016 Regional League Division 2 Southern Region
Changes from last season
Changed clubs
- Ayutthaya Warrior was reinstated to Phichit.
Changed name
- Ratchaphruek University changed to Nakhon Si Thammarat Unity.
Withdrawn clubs
- Prachinburi United and BTU United have withdrawn from the 2017 campaign due to club licensing problems.
- Phichit
2017 Thai League 3 locations
Stadium and locations (Upper Region)
| Team | Location | Stadium | Capacity |
| Amnat United | Amnat Charoen | Amnat Charoen Provincial Stadium | 2,500 |
| Ayutthaya | Ayutthaya | Udhomseelwitthaya School Stadium | 1,800 |
| Ayutthaya United | Ayutthaya | Senabodee Stadium ' Ayutthaya Provincial Stadium ' | 2,500 6,000 |
| Chachoengsao | Chachoengsao | Chachoengsao Municipality Stadium | 6,000 |
| Kalasin | Kalasin | Kalasin Municipality Stadium | 2,580 |
| Kamphaengphet | Kamphaengphet | Cha Kung Rao Stadium | 2,600 |
| Khonkaen | Khonkaen | Khonkaen PAO. Stadium | 8,000 |
| Lamphun Warrior | Lamphun | Mae-Guang Stadium | 3,000 |
| Phayao | Phayao | Phayao Provincial Stadium | 6,000 |
| Phrae United | Phrae | Thunghong Municipality Stadium | 4,500 |
| Sakaeo | Sakaeo | Sakaeo PAO. Stadium | 10,000 |
| Singburi Bangrajun | Singburi | Singburi Provincial Stadium | 4,000 |
| Ubon Ratchathani | Ubon Ratchathani | Ubon Ratchathani University Stadium | 2,000 |
| Udon Thani | Udon Thani | Udon Thani Rajabhat University Stadium | 4,500 |