Miler Magrath (also Miler McGrath or Myler McGrath, Irish: Maolmhuire Mag Raith; c. 1523 – 14 November 1622), was an Irish priest and archbishop born in County Fermanagh, Ireland. He came from a family of hereditary historians to the O'Brien clan. He entered the Franciscan Order and was ordained to the Roman Catholic priesthood. The Vatican later appointed him the Bishop of Down and Connor in Ireland, but he converted to the Anglican Church of England (since the passage of the 'Irish Church Act 1869' the Anglican Church in Ireland is known as the 'Church of Ireland') and became the Protestant Archbishop of Cashel. Magrath is viewed with contempt by both Protestant and Catholic historians, owing to his ambiguous and corrupt activities during the Reformation. He also served as a member of the Parliament of Ireland.