A crowned republic, also known as a monarchial republic, is an informal term that has been used to refer to a system of monarchy where the monarch's role may be seen as almost entirely ceremonial and where nearly all of the royal prerogatives are exercised in such a way that the monarch personally has little power over executive and constitutional issues. The term has been used by a small number of authors (below) to informally describe governments such as Australia and the United Kingdom, although these countries are classified as constitutional monarchies. The term "crowned republic" may also refer to historical republics which had a doge as their head of state, most particularly Venice and Genoa, and is sometimes used to describe the current Republic of San Marino.

Constitutional monarchy, also known as limited monarchy, parliamentary monarchy or democratic monarchy, is a form of monarchy in which the monarch exercises their authority in accordance with a constitution and is not alone in making decisions. Constitutional monarchies differ from absolute monarchies in that they are bound to exercise powers and authorities within limits prescribed by an established legal framework.