Nanyang Huizhong (Chinese: 南陽慧忠; pinyin: Nányáng Huìzhōng; Japanese: Nan'yō Echū; Korean: Namyang Hyech'ung; Vietnamese: Nam Dương Huệ Trung; 675-775 CE) was a Zen monk during the Tang dynasty.

Huizhong was born in Zhuji, but left home at a young age to become a monk under a Vinaya teacher.

Instead, he is purported to have spent forty uninterrupted years practicing Zen on Baiya Mountain's (白崕) Dangzi Valley (黨子) in Nanyang before being summoned by Emperor Suzong in 761.

[1] At this point his reputation as a master preceded him and he developed a personal connection to the two Chinese emperors, Suzong and Daizong, becoming a major figure at the imperial court.

[2] Huizhong remained an influential figure in later eras, and he is featured in numerous koan collections, including the Blue Cliff Records, The Book of Equanimity, and the Gateless Gate.