沙耶武里是老挝的城镇，也是沙耶武里的首府，位于该国西北部湄公河支流畔，距离琅勃拉邦80公里，毗邻与泰国接壤的边境，人口约16,200，居民主要信奉佛教。

Sainyabuli, Xaignabouli, Xayaburi or Xayaboury (Lao:ໄຊຍະບູລີ) is the capital of Sainyabuli Province, Laos. It lies along 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 located in the area. Sainyabuli Airport lies in the southwest of the town.