Wine laws are legislation regulating various aspects of production and sales of wine. The purpose of wine laws includes combating wine fraud, by means of regulated protected designations of origin, labelling practices and classification of wine, as well as regulating allowed additives and procedures in winemaking and viticulture. Legislation affecting all kinds of alcohol beverages, such as the legal drinking age and licensing practices related to distribution and sales, are usually not considered wine laws.
Wine is regulated by regional, state, and local laws. The laws and their relative rigidity differ for New World and Old World wines. Old World wines tend to have more stringent regulations than New World wines. Various wine laws, however, may include appellation-based regulations that cover boundaries as well as permitted grape varieties and winemaking practice-such as the French Appellation d'origine contrôlée (AOC), Italian Denominazione di origine controllata (DOC), Spanish Denominación de Origen (DO) and Portuguese Denominação de Origem Controlada (DOC). In some New World wine regions, such as the United States and Australia, the wine laws of the appellation systems (American Viticultural Area (AVA) and Australian Geographical Indication (GIs)) only pertain to boundary specifics and guaranteeing that a certain percentage of grapes come from the area listed on the wine label.
Some wine laws are established by local governments and are specific to that wine region, such as the 1954 municipal decree in the village of Châteauneuf-du-Pape that banned the overhead flying, landing or taking off of flying saucers in the commune which could negatively affect the region's vineyards and wine production.
The oldest known wine laws were created by the Roman emperor Domitian, who c. 92 issued an edict that banned the plantings of any new vineyards in Italy and ordered the uprooting of half of the vineyards in Roman provinces. The purpose of the edict was to improve the food supply of Roman cities by increasing the production of cereals.