Alairac (French pronunciation: [alɛʁak] ⓘ) is a commune in the Aude department in the Occitanie region of southern France.

The commune is in the urban area of Carcassonne and is located on a hillock at the foot of the Malepère mountain range.

Inside the commune there are several streams with the Ruisseau de Celule Ou Gautel passing near the village.

To the north-east is the city of Carcassonne and to the south the Malepère mountain range covered in oak forest, the domain of wild boar and mushroom collectors.

During the Albigensian Crusade at Easter 1210, Simon de Montfort besieged the castle at Alairac for eleven days at which the people, fearing they may have to surrender, fled by night.

On hearing the sound of an approaching large company from Routiers in 1366, the officers of the Bailiwick of Carcassonne ordered the inhabitants of the castle at Alairac — which belonged to Jean d'Armagnac — to fortify it and destroy the surrounding area.

Every 19 March the laying of wreaths takes place to commemorate the date the Évian Accords came into force.

[5] Viticulture: Malepère (AOC) The commune has several religious buildings and structures that are registered as historical monuments: There is a hall for teenagers (12–17 years old) organised by the CIAS of Carcassonne.