Chai Rong, later known as Guo Rong (郭榮), also known by his temple name as the Emperor Shizong of Zhou, was the second emperor of the Later Zhou dynasty of China, during the Five Dynasties and Ten Kingdoms period. He reigned from 954 until his death in 959. He succeeded his uncle-in-law Guo Wei, whose surname he had adopted.

Zhou, known as the Later Zhou in historiography, was a short-lived Chinese imperial dynasty and the last of the Five Dynasties that controlled most of northern China during the Five Dynasties and Ten Kingdoms period. Founded by Guo Wei, it was preceded by the Later Han dynasty and succeeded by the Northern Song dynasty.