Emperor Quang Trung (Vietnamese: [kwāːŋ ʈūŋm] Hán tự: 光中, 1753 – 16 September 1792) or Nguyễn Huệ (Vietnamese: [ŋwĩəŋ hwêˀ] Hán tự: 阮惠), also known as Nguyễn Quang Bình (Vietnamese: [ŋwĩəŋ kwāːŋ ɓîŋ̟] Hán tự: 阮光平), was the second emperor of the Tây Sơn dynasty, reigning from 1788 until 1792. He was also one of the most successful military commanders in Vietnam's history. Nguyễn Huệ and his brothers, Nguyễn Nhạc and Nguyễn Lữ, together known as the Tây Sơn brothers, were the leaders of the Tây Sơn rebellion. As rebels, they conquered Vietnam, overthrowing the imperial Later Lê dynasty and the two rival feudal houses of the Nguyễn in the south and the Trịnh in the north.

After several years of constant military campaigning and rule, Nguyễn Huệ died at the age of 40. Prior to his death, he had made plans to continue his march southwards in order to destroy the army of Nguyễn Ánh, a surviving heir of the Nguyễn lords.

Nguyễn Huệ's death marked the beginning of the downfall of the Tây Sơn dynasty. His successors were unable to implement the plans he had made for ruling Vietnam, leaving the empire weak and vulnerable. The Tây Sơn dynasty was overthrown by its enemy, Nguyễn Ánh, who established the imperial Nguyễn dynasty in 1802.