Vishnujana Swami (IAST: Viṣṇujana Svāmī; San Jose, June 2, 1948 - Mayapur, March 16, 1976), born Mark Stephen D'Atillo, was a disciple of A. C. Bhaktivedanta Swami Prabhupada, and a sannyasi within the International Society for Krishna Consciousness (commonly known as the 'Hare Krishnas' or ISKCON) who disappeared in 1976. He made recordings of himself singing the Hare Krishna mantra.