2017 Thai League 3 Upper Region

2017 Thai League 3 Upper Region is the 1st season of the Thai football league. It is a part of the Thai League 3 and the feeder league for the Thai League 2. A total of 14 teams will compete in the league this season, after Prachinburi United failed in getting a licence for the league and Phichit withdrew before the season started.

Promoted clubs
Four club was promoted from the 2016 Thai Division 2 League Northern Region
 * Kamphaeng Phet
 * Phrae United
 * Phayao
 * Lamphun Warrior

Five club was promoted from the 2016 Thai Division 2 League North Eastern Region
 * Udon Thani
 * Ubon Ratchathani
 * Kalasin
 * Khon Kaen
 * Amnat Poly United

Four club was promoted from the 2016 Thai Division 2 League Central Region
 * Ayutthaya Warrior
 * Ayutthaya
 * Singburi Bang Rachan
 * Ayutthaya United

Three club was promoted from the 2016 Thai Division 2 League Central Region
 * Cha Choeng Sao
 * Prachinburi United
 * Sa Kaeo

Renamed clubs

 * Phichit authorize from Ayutthaya Warrior because Phichit is an absolute football club quota.

Withdrawn clubs

 * Phichit is taking a 1-year break. This team is automatically banned 2 years, don't get subsidy and relegated to 2019 Thai League 4 Northern Region.

Expansion clubs

 * Prachinburi United Club-licensing football club didn't pass to play 2017 Thai League 3 Upper Region. This team is relegated to 2017 Thai League 4 Eastern Region again.

Foreign players
The number of foreign players is restricted to five per T3 team. A team can use five foreign players on the field in each game, including at least one player from the AFC member countries and one player from nine countries member of ASEAN (3+1+1).
 * Note :
 * players who released during summer transfer window;
 * players who registered during summer transfer window.

Top scorers

 * As of 16 September 2017.

Attendances by home match played
Source: Thai League 3

Note: Unk.1 Some error of T3 official match report 19 February 2017 (Lamphun Warrior 2–0 Ubon Ratchathani).

Unk.2 Some error of T3 official match report 30 April 2017 (Kamphaengphet 3–1 Singburi Bangrajun).

Unk.3 Some error of T3 official match report 2 July 2017 (Chachoengsao 5–0 Kamphaengphet).

Unk.4 Some error of T3 official match report 12 August 2017 (Ayutthaya 1–0 Lamphun Warrior).