2021–22 Thai League 3 Eastern Region
| Season | 2021–22 |
|---|---|
| Dates | 18 September 2021 – 26 February 2022 |
| Champions | Pattaya Dolphins United |
| Relegated | Sakaeo Royal Thai Fleet |
| T3 National Championship | Pattaya Dolphins United Chachoengsao Hi-Tek |
| Matches played | 132 |
| Goals scored | 356 (2.7 per match) |
| Top goalscorer | Pedro Augusto Silva Rodrigues (20 goals; Pattaya Dolphins United) |
| Best goalkeeper | Pitsanu Permsab (10 clean sheets; Chachoengsao Hi-Tek) |
| Biggest home win | 6 goals difference Pattaya Dolphins United 6–0 Marines Eureka (21 November 2021) |
| Biggest away win | 6 goals difference Marines Eureka 0–6 Pattaya Dolphins United (13 February 2022) |
| Highest scoring | 9 goals ACDC 2–7 Bankhai United (20 November 2021) |
| Longest winning run | 7 matches Pattaya Dolphins United |
| Longest unbeaten run | 15 matches Pattaya Dolphins United Chachoengsao Hi-Tek |
| Longest winless run | 9 matches Chanthaburi Royal Thai Fleet |
| Longest losing run | 8 matches Marines Eureka |
| Highest attendance | 726 Chachoengsao Hi-Tek 1–0 Pattaya Dolphins United (20 January 2022) |
| Lowest attendance | 0 |
| Total attendance | 17,585 |
| Average attendance | 198 |
← 2020–21 2022–23 → | |
The 2021–22 Thai League 3 Eastern region is a region in the regional stage of the 2021–22 Thai League 3. The tournament was sponsored by Blue Dragon Lottery Online, and known as the Blue Dragon League for sponsorship purposes. A total of 12 teams located in Eastern of Thailand will compete in the league of the Eastern region.