Augirein (French pronunciation: [oʒiʁɛ̃]; Occitan: Augirenh) is a commune in the Ariège department in the Occitanie region of south-western France.

The commune is almost all rugged and heavily forested except for a small area in the north where the village is.

[3] The Bouigane river flows through the north of the commune from west to east and continues to join the Lez at Audressein.

The Ruisseau de Nede rises south of the commune and flows through the centre from south to north to join the Bouigane on the north-eastern border of the commune.

[4] List of Successive Mayors[5] The inhabitants of the commune are known as Augirenois or Augirenoises in French.