Great Schism may refer to:
East–West Schism, between the Eastern Orthodox Church and the Roman Catholic Church, beginning in 1054 Western Schism, a split within the Catholic Church lasting from 1378 to 1417
See also Schism, a division between people, usually belonging to an organization, movement, or religious denomination Shia–Sunni relations, their division traces back to a Sunni–Shia schism