In common law, a writ (Anglo-Saxon gewrit, Latin breve) is a formal written order issued by a body with administrative or judicial jurisdiction; in modern usage, this body is generally a court. Warrants, prerogative writs, subpoenas, and certiorari are common types of writ, but many forms exist and have existed.
In its earliest form, a writ was simply a written order made by the English monarch to a specified person to undertake a specified action; for example, in the feudal era a military summons by the king to one of his tenants-in-chief to appear dressed for battle with retinue at a certain place and time. An early usage survives in the United Kingdom, Canada, and Australia in a writ of election, which is a written order issued on behalf of the monarch (in Canada, by the Governor General and, in Australia, by the Governor-General for elections for the House of Representatives, or state governors for state elections) to local officials (High sheriffs of every county in the United Kingdom) to hold a general election. Writs were used by the medieval English kings to summon people to Parliament (then consisting primarily of the House of Lords) whose advice was considered valuable or who were particularly influential, and who were thereby deemed to have been created "barons by writ".

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