Thai League 3
| Organising body | Thai League Co., Ltd. |
|---|---|
| Founded | 2017 |
| Country | Thailand |
| Confederation | AFC |
| Number of clubs | 68 |
| Level on pyramid | 3 |
| Promotion to | Thai League 2 |
| Relegation to | Thailand Semi-pro League |
| Domestic cup | Thai FA Cup |
| League cup(s) | Thai League Cup Thai League 3 Cup |
| Current champions | Rasisalai United (1st title) (2024–25) |
| Website | thaileague.co.th |
| Current: 2025–26 Thai League 3 | |
Thai League 3 (Thai: ไทยลีก 3), commonly known as the T3, is the third level of Thai football. It was started in 2017 First season. It is sponsored by BYD Auto and therefore officially known as the BYD Dolphin League III. In 2017, the League is divided in 2 regions and participated by 32 clubs 1st-4th clubs from 8 regions which are former members Regional League Division 2 and debutants in the season.