Absinthe (, French: [apsɛ̃t] (listen)) is an anise-flavoured spirit derived from several plants, including the flowers and leaves of Artemisia absinthium ("grand wormwood"), together with green anise, sweet fennel, and other medicinal and culinary herbs. Historically described as a highly alcoholic spirit, it is 45–74% ABV or 90–148 proof US. Absinthe traditionally has a natural green color but may also be colorless. It is commonly referred to in historical literature as la fée verte ("the green fairy"). It is sometimes mistakenly referred to as a liqueur, but is not traditionally bottled with added sugar, so is classified as a spirit. Absinthe is traditionally bottled at a high level of alcohol by volume, but it is normally diluted with water before being consumed.

Absinthe originated in the canton of Neuchâtel in Switzerland in the late 18th century. It rose to great popularity as an alcoholic drink in late 19th- and early 20th-century France, particularly among Parisian artists and writers. The consumption of absinthe was opposed by social conservatives and prohibitionists, partly due to its association with bohemian culture. From Europe and the Americas, notable absinthe drinkers included Ernest Hemingway, James Joyce, Lewis Carroll, Charles Baudelaire, Paul Verlaine, Arthur Rimbaud, Henri de Toulouse-Lautrec, Amedeo Modigliani, Pablo Picasso, Vincent van Gogh, Oscar Wilde, Marcel Proust, Aleister Crowley, Erik Satie, Edgar Allan Poe, Lord Byron, and Alfred Jarry.

Absinthe has often been portrayed as a dangerously addictive psychoactive drug and hallucinogen. The chemical compound thujone, which is present in the spirit in trace amounts, was blamed for its alleged harmful effects. By 1915, absinthe had been banned in the United States and in much of Europe, including France, the Netherlands, Belgium, Switzerland, and Austria-Hungary, yet it has not been demonstrated to be any more dangerous than ordinary spirits. Recent studies have shown that absinthe's psychoactive properties (apart from those attributable to alcohol) have been exaggerated.

A revival of absinthe began in the 1990s, following the adoption of modern European Union food and beverage laws that removed long-standing barriers to its production and sale. By the early 21st century, nearly 200 brands of absinthe were being produced in a dozen countries, most notably in France, Switzerland, Austria, Germany, the Netherlands, Spain, and the Czech Republic.