Huangbo Xiyun (simplified Chinese: 黄檗希运; traditional Chinese: 黄檗希運; Wade–Giles: Huang-po Hsi-yün; lit. 'Xiyun of Mt. Huangbo', Japanese: Ōbaku Kiun) (died 850) was an influential master of Chan Buddhism during the Tang dynasty. He was part of the Hongzhou school of Chan founded by Mazu.
Huangbo was a student of Baizhang Huaihai (720–814), and the teacher of Linji Yixuan (J. Rinzai) (died 866) (Wade–Giles: Lin-chi I-hsüan; Japanese: Rinzai Gigen).
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