The Battle of Ngọc Hồi-Đống Đa or Qing invasion of Đại Việt, also known as Victory of Kỷ Dậu, was fought between the forces of the Vietnamese Tây Sơn dynasty and the Qing dynasty in Ngọc Hồi and Đống Đa in northern Vietnam from 1788 to 1789. It resulted in the failure of the Chinese to restore the last Lê emperor Chiêu Thống, who had been usurped by the Tây Sơn. It is considered one of the greatest victories in Vietnamese military history.

The Tây Sơn dynasty (Vietnamese: [təj ʂəːn], Vietnamese: Nhà Tây Sơn, Chữ Nôm: 茹西山, lit. 'House of Tây Sơn'; Vietnamese: triều Tây Sơn, officially Great Việt, was a dynasty of Vietnam. It was founded after three Nguyễn brothers from the village of Tây Sơn rebelled against the Lê dynasty, Nguyễn lords, and Trịnh lords. The Tây Sơn were led by these three brothers, referred to by modern Vietnamese historians as the Tây Sơn brothers because of their origin in the district of Tây Sơn. The Tây Sơn was later succeeded by the Nguyễn dynasty.