Alet-les-Bains (French pronunciation: [alɛt le bɛ̃] ⓘ; Alet in Occitan, formerly spelt Aleth) is a commune in the Aude department in the Occitanie region in southern France.

Access to the SNCF (French National Railway Company) can be found at the Alet-les-Bains train station.

In the seventeenth century, Nicolas Pavillon, bishop of Alet who stood up against the government of Louis XIV; could have found the means to repair the abbey, but did not feel that given the poverty of the people in his diocese, it would be acceptable.

The thirty-fifth and last bishop of Alet, Charles de la Cropte de Chanterac, who opened the "Grande route" (Big road) Limoux-Quillan, also built a new portion of the bishopric, which he attached to the oldest part of the bishopric, which dates from the twelfth century and is now preserved.

By the separation of church and state, the bishopric became the property of the persons who lived in his estates, which were dispersed around the region.