Ordinance may refer to:

• A law made by a colony, or a municipality or other local authority, see also Local ordinance
• A law or decree made by any authority or authoritative body:
• Ordonnance, in French government, a regulation adopted by the executive in a domain normally reserved for statute law
• Ordinance (Belgium), a law adopted by the Brussels Parliament or the Common Community Commission
• Imperial ordinance, an order issued by an emperor
• Ordinance (university), a particular class of internal legislation in a United Kingdom university
• See also: New Ordinances of 1311, List of Acts and Ordinances of the Parliament of England, 1642 to 1660, and Northwest Ordinance

In religion:

• Ordination, the process by which one is consecrated
• Ecclesiastical ordinances, the bylaws of a Christian religious organization
• Ordinance (Christian), Protestant term for religious ritual
• Baptist ordinance, Believer's Baptism and Lord's Supper
• Ordinance (Latter Day Saints), a religious ritual of special significance
• Ordinance room, place for Latter Day Saint ordinances