Heshang Moheyan was a late 8th century Buddhist monk associated with the East Mountain Teaching. Moheyan (摩訶衍) is a brief translation of Mahayana in Chinese, so the name literally means a Mahayana monk. He became famous for representing Chan Buddhism in the so called "Council of Lhasa," a debate between adherents of the Indian teachings of "gradual enlightenment" and the Chinese teachings of "sudden enlightenment," which according to tradition was won by the "gradual teachings."

East Mountain Teaching denotes the teachings of the Fourth Ancestor Dayi Daoxin, his student and heir the Fifth Ancestor Daman Hongren, and their students and lineage of Chan Buddhism.