The monarchy of Belize is a system of government in which a hereditary monarch is the sovereign and head of state of Belize. The current Belizean monarch and head of state since 8 September 2022, is King Charles III. As sovereign, he is the personal embodiment of the Belizean Crown. Although the person of the sovereign is shared with 14 other independent countries within the Commonwealth of Nations, each country's monarchy is separate and legally distinct. As a result, the current monarch is officially titled King of Belize and, in this capacity, he and other members of the royal family undertake public and private functions as representatives of the Belizean state. However, the King is the only member of the royal family with any constitutional role.

Belize is a country on the north-eastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a water boundary with Honduras to the southeast.