Statutory law or statute law is written law (as opposed to oral or customary law) set down by a legislature (as opposed to regulatory law promulgated by the executive branch or common law of the judiciary in a typical democracy/republic) or by a legislator (in the case of an absolute monarchy).

Statutes may originate with national, state legislatures or local municipalities. Statutes of lower jurisdictions are subordinate to the law of higher.

The term codified law refers to statutes that have been organized ("codified") by subject matter; in this narrower sense, some but not all statutes are considered "codified." The entire body of codified statute is referred to as a "code," such as the United States Code, the Ohio Revised Code or the Code of Canon Law. The substantive provisions of the Act could be codified (arranged by subject matter) in one or more titles of the United States Code while the "effective date" provisions—remaining uncodified—would be available by reference to the United States Statutes at Large. Another meaning of "codified law" is a statute that takes the common law in a certain area of the law and puts it in statute or code form.