2025–26 Thai League 3 Western Region

The 2025–26 Thai League 3 Western Region is part of the 2025–26 Thai League 3 Regional Stage, consisting of 11 clubs located in the western region of Thailand, along with some from the western part of the central region. The season will commence on 13 September 2025, with clubs competing in a round-robin format featuring home-and-away matches. The Regional Stage will conclude on TBD, at which point the top two clubs will advance to the National Championship Stage, while the bottom-placed club will face relegation to the Thailand Semi-pro League for the following season. This stage brings together clubs from the lush landscapes and mountainous terrain of the West, where football continues to unite communities in a region of natural beauty.