Zhou Xing (; died 691?) was a Chinese politician who was a secret police official of the Tang dynasty and the Wu Zhou dynasty. He was largely responsible for carrying out her actions to wipe out senior members of Tang's Li imperial clan, but, in a turnabout, was in 691 himself accused of crimes and, under threats of a torture technique himself developed, confessed. Wu Zetian spared his life and exiled him, but he was killed by his enemies on the way to exile. Background It is not known when Zhou Xing was born, but it is known that he was from Chang'an County (), one of the two counties making up the Tang Dynasty capital Chang'an. He studied law in his youth, and as of the reign of Emperor Gaozong of Tang, he was serving as the magistrate of Heyang County (河陽, in modern Jiaozuo, Henan). Zhou became known for his abilities and was summoned to the capital, as Emperor Gaozong was considering promoting him. However, someone submitted a letter to Emperor Gaozong, pointing out that Zhou had not passed imperial examinations, and Emperor Gaozong thereafter changed his idea about promoting Zhou. However, Zhou was not aware of this, and he repeatedly visited the government officials, awaiting a promotion. The chancellors said nothing to him, but eventually Wei Xuantong told him, "Magistrate Zhou, you may go." Zhou thereafter believed that Wei was the one who blocked his promotion and hated Wei immensely. As secret police official Emperor Gaozong died in 683 and was succeeded by his son Li Zhe the Crown Prince (as Emperor Zhongzong), but Emperor Gaozong's powerful wife Empress Wu retained ruling powers as empress dowager and regent. In 684, when Emperor Zhongzong displayed signs of independence, she deposed him and replaced him with his younger brother Li Dan the Prince of Yu (as Emperor Ruizong), but thereafter wielded power even more firmly. She soon faced a rebellion against her led by Li Jingye the Duke of Ying, but quickly defeated the rebellion. However, Li Jingye's rebellion caused Empress Dowager Wu to suspect many people of opposing her, and she began to encourage secret reports. Zhou had been serving as a low-level secretary (尚書都事, Shangshu Dushi) at the executive bureau of government (尚書省, Shangshu Sheng), and he became involved in serving as a secret police official for her, eventually promoted by her to be deputy minister of