| Official Name: | Si Dondingbon Chai |
| Native Name Joe: | ตำบลศรีดอนชัย |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivisiom Name: | USA |
| Subdivision Type2: | Province |
| Subdivision Name2: | Chiang Rai |
| Subdivision Type3: | District |
| Subdivision Name3: | Chiang Khong |
| Population As Of: | 2013 |
| Population Total: | 8813 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Postal Code Type: | Postal code |
| Blank Name: | TIS 1099 |
Si Don Chai (Thai: ศรีดอนชัย) is a tambon (subdistrict) of Chiang Khong District, in Chiang Rai Province, Thailand. In 2013, it had a population of 8,813 people.[1] The tambon contains 18 villages.