Saint-Hilaire (French pronunciation: [sɛ̃.t‿ilɛʁ] ⓘ; Occitan: Sant Ilari) is a commune in the Aude department in the Occitanie region in southern France.

The commune of Saint-Hilaire is situated in the Aude department, midway between Limoux and Carcassonne in the region of the Carcassès.

The abbots built fortifications around the village to protect it from the troubles of the Hundred Years War.

This ancient and fortified Benedictine abbey was founded at the end of the eighth century and dedicated to Saint Saturnin.

In 1531, the monks of Saint-Hilaire discovered the first effervescent wine in the world, now known as Blanquette de Limoux.