Wang Haogu (Chinese: 王好古; pinyin: Wáng Hǎogǔ; 1200–1264),[1] courtesy name Haizang (Chinese: 海藏; pinyin: Hǎizàng),[2] was a Chinese physician and writer. He authored a treatise on insanity and its remedies, in addition to a materia medica that uniquely categorised drugs according to the theory of the wuxing (Five Phases).