Ustou (; ) is a commune in the Ariège department in southwestern France.
The commune of Ustou comprises several villages: Saint-Lizier, Le Trein, Sérac; and numerous hamlets, including: Escots, Bieille, Rouze.
Population Inhabitants of Ustou are called Ustouens in French.
Sights The Château de Mirabat, a Middle Ages castle, known to be in ruins in the 14th century, is in the communes of Seix, Oust and Ustou.
See also Communes of the Ariège department
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