Guifeng Zongmi (Chinese: 圭峰宗密; pinyin: Guīfēng Zōngmì; Japanese pronunciation: Keihō Shūmitsu) (780–1 February 841) was a Tang dynasty Buddhist scholar and bhikkhu, installed as fifth patriarch of the Huayan school as well as a patriarch of the Heze school of Southern Chan Buddhism. He wrote a number of works on the contemporary situation of Tang Buddhism, which also discussed Taoism and Confucianism. He also wrote critical analyses of Chan and Huayan, as well as numerous scriptural exegeses.