Thailand Semi-pro League (), commonly known as the TS, is the fourth tier of the Thai football league system, organized by the Football Association of Thailand (FA Thailand) and managed by Thai League Co., Ltd. The league was established in 2023 as a pathway for amateur clubs seeking promotion to Thai League 3.
Clubs participating in the competition are admitted through an annual application process. As a result, the number of participating clubs varies from season to season, depending on the number of applicants meeting the Semi-pro Club Licensing requirements set by the Football Association of Thailand.
The competition operates without relegation, with regional champions earning promotion to Thai League 3.
Season records
In the inaugural 2023 season, the competition was divided into five regional zones: Northern, Northeastern, Eastern, Western, and Bangkok Metropolitan. The Southern region was not contested due to a lack of club applications. As a result, the Southern promotion berth was allocated to the champions of the 2023 Thailand Amateur League Southern region.
In 2024, the competition expanded to include all six regional zones: Northern, Northeastern, Eastern, Western, Southern, and Bangkok Metropolitan, reflecting increased nationwide participation.
From the 2025 season onward, the league continued to operate with six regional zones. However, the Bangkok Metropolitan region was dissolved and replaced by the newly established Central region in accordance with the regional restructuring introduced in the 2024–25 Thai League 3.
In 2026, the competition format was further revised with the introduction of a league-phase scheduling system in the Regional Stage. Under this format, clubs no longer played a traditional round-robin schedule within their regions. Instead, fixture pairings were predetermined through a computerized draw system, with each club playing six matches consisting of three home matches and three away matches, regardless of the number of participating clubs in each region.
The qualification format for the national championship was also changed. Unlike previous seasons, which featured a National Championship Stage contested by all six regional champions, the 2026 season used a ranking system based on Regional Stage records to determine the finalists. The two highest-ranked regional champions advanced directly to the Finals, which were contested over two legs on a home-and-away basis.
No.SeasonsNumberof clubsNational ChampionshipPromoted clubsChampionsRunners-upRegionWinnersSpecial promoted club(s)1202334SatunKhelang UnitedNorthernKhelang UnitedNortheasternSuranaree Army 2EasternPrachinburi CityBanfootball PattayaWesternThap Luang UnitedSouthernSatunThe iCON RSU2202438Roi Et PB UnitedDomeNorthernChattrakan CityNortheasternRoi Et PB UnitedEasternPadriew CityWesternSamut Songkhram CitySouthernYala CityDome3202540Banbueng CitySamui UnitedNorthernPhichit UnitedChiangrai TSCNortheasternUdon Banjan UnitedEUMTEasternBanbueng CityCentralSingburi WarriorsFutera UnitedWesternSouthernSamui UnitedChumphon United4202653MNKAyutthaya PKNorthernTNSU LampangPaknamphoNortheasternEsan FighterPitchaya Bundit CollegeEasternMNKBanbuengCentralAyutthaya PKBangkapiWesternPhetchaburiSouthernNaraYala City Note:
References