A constitutional monarchy, limited monarchy, parliamentary monarchy (also crowned republic), is a form of monarchy where the governing powers of the monarch are restricted by the terms of a constitution.

A constitutional monarchy may refer to a system in which the monarch acts as a non-party political head of state under the constitution, whether written or unwritten. While most monarchs may hold formal reserve powers and the government may officially take place in the monarch's name, they do not set public policy or choose political leaders. In addition to acting as a visible symbol of unity, a constitutional monarch may hold formal powers such as dissolving parliament or giving Royal Assent to legislation. However, the exercise of such powers is generally a formality rather than an opportunity for the sovereign to enact personal political preference. Some constitutional monarchs, however, retain significant power and influence and play an important political role.

Unionwide, many planets (Merke, Planet‏‎; Royal, Planet and others) and some species (e.g., the Golden) operate under a constitutional monarchy system.

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