The Monarchy of Saint Kitts and Nevis (the Kittitian and Nevisian monarchy) is a system of government in which a hereditary monarch is the sovereign of Saint Kitts and Nevis. The present monarch of Saint Kitts and Nevis is Elizabeth II, who is also Sovereign of the other Commonwealth realms.

The Queen's constitutional roles are mostly delegated to the Governor-General of Saint Kitts and Nevis. Royal succession is governed by the English Act of Settlement of 1701, which is part of constitutional law.