Guo Zongxun (Chinese: 郭宗訓) (14 September 953^[2] – 973) or Chai Zongxun (Chinese: 柴宗訓), also known by his posthumous name as the Emperor Gong of Zhou (Chinese: 周恭帝), was the third and last emperor the Chinese Later Zhou dynasty, during the Five Dynasties and Ten Kingdoms period. He reigned from July 959, when he succeeded his father Chai Rong (Emperor Shizong of Zhou), until February 960, when he was overthrown by his general Zhao Kuangyin (Emperor Taizu of Song), who founded the Song dynasty.

The Emperor Gong was sent away with his mother to Xijing (西京). Despite assurance by the Emperor Taizu of Song that the Chai family would be treated with respect, the Emperor Gong was killed in 973 by Xin Wenyue, an official trying to gain favour with the emperor^{[citation needed]}. Upon hearing the news, the Emperor Taizu ordered a period of mourning and buried the dethroned emperor next to the Emperor Shizong's tomb.