Ly Thái Tông (1000–1054) is the posthumous title of Lý Phật Mã, emperor of the Ly Dynasty of Dai Viet (Northern Vietnam) from 1028 to 1054.

His father was Ly Công Uan, posthumously known as Ly Thái Tổ, the founder and the first emperor of the Ly Dynasty.

During his reign, he builds the basic bureaucratic infrastructure for the dynasty and is considered one of the greatest kings and emperors in Vietnamese history.