Château Quinault is a winery from the appellation Saint-Émilion within the city of Libourne, producing Quinault L'Enclos, a Bordeaux wine counted among the Bordeaux Right Bank "supercuvées" or "vins de garage". The estate also produces a second wine, Lafleur de Quinault, and a special cuvée called L'Absolut de Quinault.
A walled vineyard in the Libourne suburbs, located in what was until 1973 the satellite appellation Sables-Saint-Émilion, the past of Château Quinault is largely unknown but believed to have originated in the 17th century.
In 1930 it was bought by the négociant Baptiste Mons, while the estate lost 8 hectares expropriated for use as a cemetery. Quinault was inherited by his son-in-law Henri Maleret in 1948, who ran the estate until the 90s.
Upon learning that a German real estate company planned to buy the property and construct a housing development, Dr. Alain Raynaud and Françoise Raynaud acquired Quinault for USD$3.4 million. Dr. Raynaud, a former physician and president of the Union des Grands Crus (1994–2000), is also owner of the Pomerol estates Château La Croix-de-Gay and Château La Fleur-de-Gay and supervises production at Château Lascombes, while he is often exemplified by media as a friend of Robert Parker, and has a reputation as a "Bordeaux maverick".
The Raynauds made substantial investments to the estate while applying some techniques considered unorthodox to the winemaking. Michel Rolland and Denis Dubourdieu are retained as consultant oenologists.
Raynaud was among the wine personalities satirised next to Robert Parker in the 2010 bande dessinée comic book, Robert Parker: Les Sept Pêchés capiteux.