Trần Duệ Tông (Hán tự: 陳睿宗, 1337–1377), given name Trần Kính (陳曔), was the ninth emperor of the Trần Dynasty who reigned Đại Việt from 1373 to 1377. Duệ Tông succeeded the throne from his brother Trần Nghệ Tông who was credited with the re-establishment of Trần clan's ruling in Đại Việt from Hôn Đức Công. During his short-lived reign, Duệ Tông had to witness the rising of Hồ Quý Ly in royal court and several consecutive attacks in Đại Việt from Chế Bồng Nga, king of Champa. In 1377 Duệ Tông decided to personally command a major military campaign against Champa, this campaign was ended by the disastrous defeat of Trần's army in Battle of Đồ Bàn where Duệ Tông himself was killed in action with many other high-ranking mandarins and generals of Đại Việt. Duệ Tông's death was one of the main ev