Huángbò Xīyùn (simplified Chinese: 黄檗希运; traditional Chinese: 黄檗希運; Wade–Giles: Huang-po Hsi-yün; literally "Xiyun of Mt. Huangbo", Japanese: Ōbaku Kiun) (died 850) was an influential Chinese master of Zen Buddhism during the Tang Dynasty.
Huángbò was a disciple of Baizhang Huaihai (720-840), and the teacher of Linji Yixuan (died 866) (Wade-Giles: Lin-chi I-hsüan; Japanese: Rinzai Gigen).