In this phase, clubs compete for the national title and the opportunity for promotion to Thai League 2 for the next season.

By reorganizing the regional groups, Thai League 3 continues to play a crucial role in the development of football nationwide, ensuring a fair and competitive environment for all participating clubs.

[3] As a result, Kasetsart, which had the best ranking among the clubs in the relegation zone, remained in Thai League 2 instead.

This renaming was part of a broader effort to align the regions more closely with the geographical locations of the clubs.

To further support this adjustment: These changes ensure that clubs are placed in regions that better reflect their actual geographical locations, promoting a more balanced and competitive league structure.

This stage serves to determine the regional winners and which clubs advance to the national competition.

The knockout stage, held over two legs, uses aggregate scoring, with the away goals rule applied in case of a tie.