Clos de Tart is a Grand Cru vineyard in the Morey St.-Denis appellation of Burgundy. During the Middle Ages it was owned by Cistercian monks, but it was sold at auction after the French Revolution. In 1932 the 18.6 acre vineyard was bought by the negociant Mommessin, which today owns the entirety of the vineyard and runs it as a monopoly. Vineyards are planted to north to south, which is unusual, which is partly to help guard against erosion. The soil is stony with some clay.