The 2017 Thai League 3 (known as the Euro Cake League Pro for sponsorship reasons) football season will be the first season of Thai League 3. 29 clubs will be divided into 2 groups (regions).
Clubs
Upper Region
Promoted from 2016 Regional League Division 2 Northern Division
Kamphaeng Phet
Phrae United
Phayao
Lamphun Warrior
Promoted from 2016 Regional League Division 2 North-Eastern Region
Udon Thani
Ubon Ratchathani
Kalasin
Khon Kaen
Amnat Poly United
Promoted from 2016 Regional League Division 2 Eastern Region
Cha Choeng Sao
Prachinburi United
Sa Kaeo
Promoted from 2016 Regional League Division 2 Central Region
Ayutthaya Warrior
Ayutthaya
Singburi Bang Rachan
Ayutthaya United
Lower Region
Promoted from 2016 Regional League Division 2 Bangkok & field Region
Chamchuri United
BU.Deffo
Royal Thai Army
Promoted from 2016 Regional League Division 2 Bangkok & Eastern Region
Raj Pracha
Customs United
Banbung United
Kasem Bundit University
Promoted from 2016 Regional League Division 2 Western Region
Samut Sakhon
Krung Thonburi
Ratchaphruek University
Simork
BTU United
Promoted from 2016 Regional League Division 2 Southern Region
Surat Thani
Nara United
Trang
Ranong United
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Withdrawn clubs
Prachinburi United and BTU United have withdrawn from the 2017 campaign due to club licensing problems.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)
Stadium and locations (Lower Region)
Results
League table (Upper Region)
League table (Lower Region)
Third place play-off
This round was featured by Udon Thani, the second place of 2017 Thai League 3 Upper Region and Trang, the second place of 2017 Thai League 3 Lower Region. Winners of third place play-off would promoted to 2018 Thai League 2.
Summary
Matches
3–3 on aggregate. Udon Thani won on away goals.
Final
This round was featured by Khonkaen, the first place of 2017 Thai League 3 Upper Region and Samut Sakhon, the first place of 2017 Thai League 3 Lower Region. Both winners and runners-up would promoted to 2018 Thai League 2 automatically.
Summary
Matches
Samut Sakhon won 5–2 on aggregate.