Arrout (; ) is a commune in the Ariège department in the Occitanie region of south-western France.
Arrout is a commune in the Pyrenees mountains in the former province of Couserans some 12 km south-west of Saint-Girons and 3 km north of Castillon-en-Couserans. Access to the commune is by a country road from the end of the D404, which comes from Cescau in the south-east, to the village or by the Chemin d'Arrout from Audressein in the south. There is also a country road from Alas in the north-east. The commune is rugged and heavily forested throughout.
The Lez river forms the south-eastern border of the commune as it flows north-east to join the Salat at Saint-Girons. The Cayssau stream rises in the north-west and forms the north-western border before joining the Ruisseau de Lachein. The Ruisseau de Lasquert rises in the centre of the commune and flows north-east to join the Ruisseau de Lachein which flows south-west to join the Lez.
List of Successive Mayors
The inhabitants of the commune are known as Arrotois or Arrotoises in French.
Arrout is one of the communes who received the Green Star of Esperanto from Esperanto info, an award given to mayors of communes who take a census of Esperanto speakers.
The Church contains three items that are registered as historical objects: