The divine right of kings, or divine-right theory of kingship, is a political and religious doctrine of royal and political legitimacy. It asserts that a monarch is subject to no earthly authority, deriving the right to rule directly from the will of God. The king is thus not subject to the will of his people, the aristocracy, or any other estate of the realm, including (in the view of some, especially in Protestant countries) the Church. According to this doctrine, only God can judge an unjust king. The doctrine implies that any attempt to depose the king or to restrict his powers runs contrary to the will of God and may constitute a sacrilegious act. It is often expressed in the phrase "by the Grace of God", attached to the titles of a reigning monarch.

The remote origins of the theory are rooted in the medieval idea that God had bestowed earthly power on the king, just as God had given spiritual power and authority to the church, centering on the pope. The immediate author of the theory was Jean Bodin,[citation needed] who based it on the interpretation of Roman law. With the rise of nation-states and the Protestant Reformation, the theory of divine right justified the king's absolute authority in both political and spiritual matters. The theory came to the fore in England under the reign of James I of England (1603–1625, also known as James VI of Scotland 1567–1625). Louis XIV of France (1643–1715) strongly promoted the theory as well.
The theory of divine right was abandoned in England during the Glorious Revolution of 1688–89. The American and French Revolutions of the late eighteenth century further weakened the theory's appeal, and by the early twentieth century, it had been virtually abandoned.

The Scots textbooks of the divine right of kings were written in 1597-98 by James VI of Scotland before his accession to the English throne. His Basilikon Doron, a manual on the powers of a king, was written to edify his four-year-old son Henry Frederick king "acknowledgeth himself ordained for his people, having received from the god a burden of government, whereof he must be countable."