The Bordeaux Wine Official Classification of 1855 was a ranking system established for the wines of the Bordeaux region in France. Created for the 1855 Exposition Universelle in Paris, it classified the wines of the Medoc and Sauternes into five categories, known as "crus," based on their reputation and price. The classification primarily focused on the red wines of the Medoc and included notable estates like Château Lafite Rothschild and Château Margaux. This classification has remained largely unchanged since its inception, making it one of the oldest and most recognized wine classifications in the world. It serves as a reference for wine quality and has significantly influenced the market value of Bordeaux wines. The 1855 classification is still used today, highlighting the enduring legacy of these prestigious estates.