Plagiopholis styani, also known by the common name Chinese mountain snake, is a species of colubrid snake. Its type locality is Kuatun (Guadun in modern spelling: Chinese:挂墩; pinyin:guàdūn) in Wuyishan, Fujian. It is found in southern and central China, Taiwan, and northern Vietnam. It is an uncommon species, and very rare in Taiwan. It is named after Frederick William Styan, a Shanghai-based English tea merchant and ornithologist.