Léognan (French pronunciation: [leɔɲɑ̃]; Gascon: Leunhan) is a commune in the Gironde department, Nouvelle-Aquitaine, southwestern France.

Its inhabitants are called Léognanais.

It is located in the Graves area of the Bordeaux county, known for its red wine (Pessac-Léognan appellation): The processing plant for Cacolac has been located here since 2000.

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