St. Nicodemus the Hagiorite or St. Nicodemus of the Holy Mountain (; 1749 – July 14, 1809) is a saint of the Eastern Orthodox Church. He was an ascetic monk, mystic, theologian, and philosopher. His life's work was a revival of traditional Christian practices and patristic literature. He wrote ascetic prayer literature and influenced the rediscovery of Hesychasm, a method of contemplative prayer from the Byzantine period. He is most famous for his work with St. Macarius of Corinth on the anthology of monastic spiritual writings known as The Philokalia. He was canonized by the Ecumenical Patriarch of Constantinople in 1955.