Chiang Saen
| Chiang Saen เชียงแสน | |
|---|---|
| The Mekong at Chiang Saen | |
| Location in Thailand | |
| Coordinates: 20°16′31.3″N 100°05′15.5″E / 20.275361°N 100.087639°E | |
| Country | Thailand | 
| Province | Chiang Rai Province | 
| District | Chiang Saen | 
| Area | |
|  • Total | 554 km2 (214 sq mi) | 
| Population  (31 december 2018) | |
|  • Total | 5,618 | 
| Time zone | UTC+7 (ICT) | 
Chiang Saen (Thai: เชียงแสน) is an old city in Northern Thailand. Chiang Saen is the capital of the Chiang Saen district, which lies in the north of the Chiang Rai province.