A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed by it. The word itself is used, particularly in Commonwealth countries, as an abstract name for the monarchy itself, as distinct from the individual who inhabits it. A specific type of crown is employed in heraldry under strict rules. Indeed, some monarchies never had a physical crown, just a heraldic representation, as in the constitutional kingdom of Belgium.

The Crown broadly represents the state in all its aspects within the jurisprudence of the Commonwealth realms and their subdivisions. The term can be used to refer to the office of the monarch or the monarchy as institutions; to the rule of law; or to the functions of executive, legislative, and judicial governance and the civil service.