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Water Margin (simplified Chinese: 水浒传; traditional Chinese: 水滸傳; pinyin: Shuǐhǔ Zhuàn), also called Outlaws of the Marsh or All Men Are Brothers, is a Chinese novel from the Ming dynasty that is one of the preeminent Classic Chinese Novels. Attributed to Shi Nai'an, Water Margin was one of the earliest Chinese novels written in vernacular Mandarin Chinese.

Set during the Northern Song dynasty (around 1120), the story follows a group of 108 outlaws that gathers at Mount Liang (also known as Liangshan Marsh) to rebel against the government. Later they are granted amnesty and enlisted by the government to resist the nomadic conquest of the Liao dynasty and other rebels. While the book's authorship is traditionally attributed to Shi Nai'an (1296–1372), the first external reference to the novel only appeared in 1524 during the Jiajing reign of the Ming dynasty, sparking a long-lasting academic debate on when it was actually written and which historical events the author had witnessed that inspired him to write the book.

The novel is considered one of the masterpieces of early vernacular fiction and Chinese literature. It has introduced readers to some of the best-known characters in Chinese literature, such as Wu Song, Lin Chong, Pan Jinlian, Song Jiang and Lu Zhishen. Water Margin also subverted the moral, political, and social expectations in the traditional East Asian literary canon, and exerted a significant influence on the development of fiction elsewhere in the region, such as on Japanese literature.