Warner "William" McCary (c. 1811 – after 1854) was an African American convert to Mormonism who was excommunicated from the Church of Jesus Christ of Latter-day Saints (LDS Church) in 1847 for claiming to be a prophet. Some researchers have suggested that McCary's actions led to the Church's subsequent policy of not allowing people of black African descent to hold the priesthood or participate in temple ordinances.