Regional stage
The league is divided into six regional zones, following the structure of Thai League 3. The number of clubs in each region is determined by the number of clubs that meet the licensing criteria. The Northern Region has 8 clubs, the Northeastern Region has 12 clubs, the Eastern Region has 7 clubs, the Central Region has 7 clubs, the Western Region has 4 clubs, and the Southern Region has 2 clubs, making a total of 40 clubs. The competition format for the Regional Stage varies across regions: the Northern, Eastern, and Central Regions follow a single round-robin format, with each club playing 6–7 matches; the Northeastern Region also uses a round-robin format, but with 11 matches per club; the Western Region employs a double round-robin format (home and away), with each club playing 6 matches; and the Southern Region uses a quadruple round-robin format, with each club playing 4 matches. At the end of the Regional Stage, the top club from each region earns promotion to Thai League 3 for the following season and advances to the National Championship Stage. Northern region :League table :Results Northeastern region :League table :Results Eastern region :League table :Results Central region :League table :Results Western region :League table :Results Note: The match between Karin United and The Wall on 19 April 2025 was awarded as a 0–3 win to The Wall after Karin United fielded an ineligible player. Southern region :League table :Results ==National Championship stage==
National Championship stage
The National Championship Stage is held after the completion of the Regional Stage. The six regional champions qualify for this stage, where they compete for the national championship title. The competition is divided into two groups based on geography. The Upper Region group consists of the champions from the Northern Region, Northeastern Region, and Eastern Region. The Lower Region group consists of the champions from the Central Region, Western Region, and Southern Region. Each group follows a single round-robin format, with every team playing two matches. The team that finishes first in each group advances to the Finals. The Finals are played as a two-legged home-and-away knockout tie, with the winner determined by the aggregate score. The winner is crowned the Thailand Semi-pro League Champion for the 2025 season. Group stage Upper region ---- ---- Lower region ---- ---- Finals Summary Matches 1st leg ---- 2nd leg Banbueng City won 4–1 on aggregate. ==See also==