The Bordeaux Wine Official Classification of 1855 resulted from the 1855 Exposition Universelle de Paris, when Emperor Napoleon III requested a classification system for France's best Bordeaux wines that were to be on display for visitors from around the world. Brokers from the wine industry ranked the wines according to a château's reputation and trading price, which at that time was directly related to quality.

The Exposition Universelle of 1855, better known in English as the 1855 Paris Exposition, was a world's fair held on the Champs-Élysées in Paris, France, from 15 May to 15 November 1855. Its full official title was the Exposition Universelle des produits de l'Agriculture, de l'Industrie et des Beaux-Arts de Paris 1855. It was the first of ten major expositions held in the city between 1855 and 1937. Nowadays, the exposition's sole physical remnant is the Théâtre du Rond-Point des Champs-Élysées, designed by architect Gabriel Davioud, which originally housed the Panorama National.