Château d'Issan is a castle and winery in the Margaux appellation of the Bordeaux region of France. The Château d'Issan is made of 120 hectares, of which 50 are dedicated to the culture of the vines. The grapes used to produce the great wine of the château (ranked third in 1855's classification) and the second wine, Blason d'Issan, are the cabernet sauvignon and the merlot. The use of these varieties allows the château d'Issan to propose typical wine of Margaux with the strength of a Pauillac.

The Margaux appellation encompasses the village of Margaux and the neighbouring villages of Arsac, Labarde, Soussans and Cantenac. Being the most southerly of the Médoc's appellations, it has the thinnest soil in the region with the highest proportion of gravel that allows the soil to drain very well. The wine from this area are very susceptible to weather effects during the growing season. Encountering all seasons with adequate irrigation, relatively good rainfall and good amount of sunlight, the crop yields a bountiful harvest year-on-year. The winery takes pride and value that captures the essence that reflects their unique brand.