Hongzhi Zhengjue (Chinese: 宏智正覺; pinyin: Hóngzhì Zhēngjué; Wade–Giles: Hung-chih Cheng-chueh, Japanese: Wanshi Shōgaku), also sometimes called Tiantong Zhenjue (Chinese: 天童正覺; Japanese: Tendo Shōgaku) (1091-1157), was a Chinese ChanBuddhist (called Zen by the Japanese, but originally Chan) monk who authored or compiled several influential Buddhist texts. Hongzhi's conception of "silent illumination" is of particular importance to the Chinese Caodong and Japanese SōtōChan schools; however, Hongzhi was also the author of an important collection of koans, although koans are now usually associated with the Linji or Japanese Rinzai schools).
In 1129, Hongzhi began teaching at the Jingde monastery on Mount Tiantong, where he remained for nearly thirty years, until shortly before his death in 1157, when he ventured down the mountain to bid farewell to his supporters.
Hongzhi is the author or compiler of several texts important to the development of ChánBuddhism. One of these is the kōan collection known in English as The Book of Equanimity, The Book of Serenity, or The Book of Composure (Chinese: 從容録; Wade–Giles: Ts'ung-jung lu), or Shōyōroku (従容録?) in Japanese. A collection of Hongzhi's philosophical texts has also been translated by Dan Leighton.
Hongzhi often referred to as an exponent of Silent Illumination Chán, or Mokusho Zen(黙照禅?) in Japanese.
Aside from his own teacher, Eihei Dōgen, the founder of the Sōtō school of Zen in Japan, quotes Hongzhi in his work more than any other Zen figure.