2018 Thai League 3 Upper Region

2018 Thai League 3 Upper Region is the 2nd 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 Amnat United and Phayao withdrew before the season started.

Promoted Clubs
Three clubs were promoted from the 2017 Thai League 4
 * JL Chiangmai United
 * Chiangrai City
 * Marines Eureka
 * Muangkan United

Two clubs were promoted to the 2018 Thai League 2
 * Khonkaen
 * Udon Thani

Relegated Clubs
A club was relegated to the 2018 Thai League 4 Northern Region
 * Singburi Bangrajun

A club was relegated from the 2017 Thai League 2
 * Bangkok

Withdrawn Clubs

 * Amnat United and Phayao were taking a 2-years break. This team is automatically banned 2 years, don't get subsidy and relegated to 2020 Thai League 4 Northern Region for Phayao, 2020 Thai League 4 North Eastern Region for Amnat United.

Foreign players
A T3 team could registered five foreign players by at least one player from AFC member countries and at least one player from ASEAN member countries. A team can use four foreign players on the field in each game, including at least one player from the AFC member countries or ASEAN member countries (3+1). ↔: players who have dual nationality by half-caste or naturalization.
 * Note :
 * players who released during summer transfer window;
 * players who registered during summer transfer window;

Top scorers

 * As of 25 August 2018.

Attendance by home match played
Source: Thai League 3