Lézat-sur-Lèze (French pronunciation: [leza syʁ lɛz], literally Lézat on Lèze; Languedocien: Lesat) is a commune in the Ariège department in southwestern France.

The Lèze forms part of the commune's southern border, flows north through the commune, then forms part of its northern border.

Lézat-sur-Lèze is twinned with Ateca in Spain.

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