Le Petit Lion du Marquis de Las Cases is the prestigious second wine of Château Léoville Las Cases, one of the most celebrated estates in the Saint-Julien appellation of Bordeaux, France. Produced by the Delon family's Domaines Delon, this red Bordeaux blend draws primarily from the estate's younger Cabernet Sauvignon vines and old Merlot vines situated within the château's renowned clos. Typical vintages are composed of approximately 46% Cabernet Sauvignon, 43% Merlot, and 11% Cabernet Franc.

The wine displays a deep ruby color with an aromatic profile of black currants, Bing cherries, pencil shavings, lavender, clove, and pipe tobacco. On the palate it is medium-bodied with fresh acidity, proportional oak integration, and silky tannins that provide structure for aging. It delivers the elegance and complexity of Saint-Julien at a more accessible price point than the grand vin, and is consistently awarded scores in the low-to-mid 90s by leading critics. The wine benefits from decanting for 1–2 hours and has cellaring potential through the late 2030s.