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 (Emperor Duanzong).

Emperor Duzong died in 1274. His sixth son, Zhao Xian, who was then about four years old, was enthroned as the new emperor with assistance from the chancellor Jia Sidao. In the following year, Zhao Xian's grandmother (Grand Empress Dowager Xie) and mother (Empress Dowager Quan) became regents for the child emperor, although state and military power remained under Jia Sidao's control.

By the time Zhao Xian came to the throne, the Mongol Empire had already taken control of the northern and southwestern areas of China, crossed the Yangtze River and acquired key strategic locations such as Xiangyang. They were heading towards the Song capital at Lin'an (present-day Hangzhou). Grand Empress Dowager Xie pursued a dual-strategy to the pending destruction of the Song dynasty: On one hand, she ordered the people to rally behind their emperor and save the Song Empire. On the other hand, she tried to make peace with the Mongols. The Mongol army advanced further and captured Song territories and took control of various prefectures along the middle stretches of the Yangtze River.

In early 1275, Jia Sidao led an army of 30,000 to engage the Mongols at Wuhu. The Song army suffered defeat and not long afterward, bowing to public pressure, Grand Empress Dowager Xie ordered Jia Sidao's execution. However, the move came too late and the fall of the Song dynasty loomed closer.

By the middle of 1275, the Mongol army had controlled most of the Jiangdong region, the southern part of present-day Jiangsu Province. On 18 January 1276, the Mongol general Bayan showed up with his army outside Lin'an. The Song imperial court sent Lu Xiufu to negotiate for peace with the enemy, but Lu was forced to surrender. Later that year, Grand Empress Dowager Xie brought the five-year-old Zhao Xian with her to the Mongol camp to surrender.

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