| Sainyabuli | |
| Native Name Lang: | lo |
| Settlement Type: | District & municipality |
| Official Name: | Sainyabuli District |
| Pushpin Map: | Laos |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Laos |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sainyabuli |
| Unit Pref: | Imperial |
| Population As Of: | 2015 |
| Population Footnotes: | [1] |
| Population Total: | 75,700 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 19.25°N 146°W |
Sainyabuli, (Lao: ໄຊຍະບູລີ; alternatively spelled Xaignabouli, Xayaburi, or Xayaboury) is the capital of Sainyabuli Province, Laos. It lies on Route 4 which along with Route 13 connects it to Luang Prabang, roughly 80 kilometres northeast by road and to the Thai border across the Luang Prabang Range in the southwest. A passport control point is in the area. Sainyabuli Airport lies southwest of the town.
The capital stands on the banks of the Nam Hung, a tributary of the Mekong River towards the northern end of the province. The area is allegedly a heartland for military involvement in illegal timber trade.[2]
Wat Si Bun Huang, a Buddhist temple of over 500 years vintage lies in the southern part of the town. Also of note is Wat Si Phan Don, noted for its diamond-shaped stupa and Wat Sisavang Vong, reputedly erected by King Sisavang Vong himself on the site of a former temple.[3] The town contains a museum and library and two bus terminals each of which are about 2 kilometres north and south of the town respectively.[3]