Moonshine was originally a slang term for high-proof distilled spirits usually produced illicitly, without government authorization. In recent years, however, moonshine has been legalized in various countries and has become a commercial product.

Legal in the United States since 2010, moonshine is defined as "clear, unaged whiskey", typically made with corn mash as its main ingredient. Liquor-control laws in the United States always applied to moonshine, with efforts accelerated during the total ban on alcohol production mandated under the 18th Amendment of the Constitution. Since its repeal, and moonshine's recent legalization, they focus on evasion of revenue taxation on spiritous or intoxicating liquors. Applicable laws are enforced by the Bureau of Alcohol, Tobacco, Firearms and Explosives of the US Department of Justice, once known colloquially as "revenooers".