Château Mouton Rothschild is a wine estate located in the village of Pauillac in the Médoc, 50 km (30 mi) north-west of the city of Bordeaux, France. Its red wine of the same name is regarded as one of the world's greatest clarets.

Originally known as Château Brane-Mouton it was renamed by Nathaniel de Rothschild in 1853 to Château Mouton Rothschild. It was the first estate to begin complete château bottling of the harvest.
The Bordeaux Wine Official Classification of 1855 was based entirely on recent market prices for a vineyard's wines, with one exception: Château Mouton Rothschild. Despite the market prices for their vineyard's wines equalling that of Château Lafite Rothschild, Château Mouton Rothschild was excluded from First Great Growth status, an act that Baron Philippe de Rothschild referred to as "the monstrous injustice". It is widely believed that the exception was made because the vineyard had recently been purchased by an Englishman and was no longer in French ownership.

In 1973, Mouton was elevated to "first growth" status after decades of intense lobbying by its powerful and influential owner, the only change in the original 1855 classification (excepting the 1856 addition of Château Cantemerle). This prompted a change of motto: previously, the motto of the wine was Premier ne puis, second ne daigne, Mouton suis. ("First, I cannot be. Second, I do not deign to be. Mouton I am."), and it was changed to Premier je suis, Second je fus, Mouton ne change. ("First, I am. Second, I used to be. But Mouton does not change.")