Emperor Gong of Song (2 November 1271 – May 1323), personal name Zhao Xian, was the 16th emperor of the Song dynasty in China and the seventh emperor of the Southern Song Dynasty.
The sixth son of his predecessor, Emperor Duzong, Zhao Xian came to the throne around the age of four, and reigned for less than two years before he was forced to abdicate in 1276.
He was succeeded by his fifth brother, Zhao Shi, enthroned as Emperor Duanzong.