Guan Zhong (; c. 720–645 BC) was a Chinese philosopher and politician. He served as chancellor and was a reformer of the State of Qi during the Spring and Autumn period of Chinese history. His given name was Yiwu (). "Zhong" was his courtesy name. He is mainly remembered for his reforms as chancellor under Duke Huan of Qi, as well as his friendship with his colleague Bao Shuya, though his reputation remained controversial among the Confucians, as detailed in the Philosophy and appraisal section.