Osirism, also known as the Mysteries of Osiris or Osirian Mysteries, was an ancient Egyptian mystery religion centered on the worship of Osiris, the god of the afterlife. Rooted in foundational funerary beliefs, this tradition emphasized spiritual renewal, the promise of immortality, and the strict adherence to maʿat the cosmic principle of truth, balance, and moral integrity. Osirism was defined by esoteric teachings and secret rites reserved exclusively for initiates. These rituals symbolically reenacted death and resurrection of Osiris: his . This sacred drama served as a profound expression of the eternal cycle of death, renewal, and divine justice, offering participants spiritual purification and the hope of a blessed existence beyond the grave.

An osirian mystic is an initiate who seeks spiritual transformation by aligning themselves with Osiris. This identification was so central to the Egyptian worldview that ancient funerary texts frequently addressed the deceased as “Osiris,” signifying their assimilation into the god’s nature. To be an osirian mystic is an active commitment to embody the values of maʿat so that the soul may be vindicated on its day of judgment and live eternally in paradise. 

The decline of the ancient form of this tradition began with the spread of Christianity in Egypt from the 3rd century CE onward. Christian theology offered its own doctrine of resurrection, judgment, and salvation, effectively fulfilling the spiritual roles once held by Osirian belief. Imperial edicts in the late Roman period further accelerated this transition, leading to the closure of ancient temples, the dissolution of traditional priesthoods, and the eventual disappearance of formal Osirian worship. By the 6th century CE, Osirism had ceased to exist as a public religion. In the modern era, the osirian religion has seen a revival led by High Priest Mosiah Mensah (Ancient Egyptian: 𓄟𓋴𓇋𓂝𓎛𓇹 𓏠𓈖𓋴𓄿𓎛𓇼 “Child of the Moon and Eternal as Orion”), who is the Master of the Mysteries 𓃣