Mou Zongsan (Chinese: 牟宗三; pinyin: Móu Zōngsān; Wade–Giles: Mou Tsungsan, 1909–1995) was a Chinese New Confucian philosopher. He was born in Shandong province and graduated from Peking University. In 1949 he moved to Taiwan and later to Hong Kong, and he remained outside of Mainland China for the rest of his life. His thought was heavily influenced by Immanuel Kant, whose three Critiques he translated, possibly first, into Chinese, and above all by Tiantai Buddhist philosophy.
Over the last 40 years of his life, Mou wrote histories of "Neo-Daoist," Confucian, and Buddhist philosophy (totaling six volumes) a group of constructive philosophic treatises, culminating in his 1985 work, On the Summum Bonum (Chinese: 圓善論; pinyin: yuanshan lun), in which he attempts to rectify the problems in Kant's system through a Confucian-based philosophy reworked with a set of concepts appropriated from Tiantai Buddhism.
In the People's Republic of China, Mou is especially famous for his cultural traditionalism and his defense of democracy as a traditional Chinese value.