Gaozong, Wade-Giles romanization Kao-tsung, personal name (xingming) Zhao Gou   (born 1107China—died 1187, China),  temple name (miaohao) of the first emperor of the Nan (Southern) Song dynasty (1127–1279). He fled to South China when the nomadic Juchen tribesmen overran North China and captured Gaozong’s father, the abdicated Bei (Northern) Song emperor Huizong (reigned 1100–1125/26), and Gaozong’s brother, the emperor Qinzong (1125/26–27). Gaozong reestablished the dynasty in the South with greatly reduced territory in 1127. The Juchen had pursued him, but the great general Yue Fei held off the invaders, who in any case were having difficulty using their cavalry in the rivers and hills of southern and central China.

The war caused great hardship, and a debate arose within the cabinet over the value of continuing it. The peace faction prevailed, Yue Fei was executed, and in 1141 a peace treaty was signed. In 1162 the war again erupted for a short period. After a new peace treaty was signed in that same year, Gaozong abdicated. Despite its reduced size, the Nan Song became in many ways a wealthier country than the combined Song empire had been.