Arrout (French pronunciation: [aʁu]; Occitan: Arrot) 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.

Blazon: Quarterly, 1 and 4 Azure with a roundel of Or; 2 and 3 Argent with an eagle of Sable.

This list is incomplete; you can help by adding missing items. (April 2021)

List of Successive Mayors

From	To	Name
2001	2010	Georges Garié
2010	2020	Christiane Vignau
2020	2026	Patrice Savarino

The inhabitants of the commune are known as Arrotois or Arrotoises in French.

Historical population

Year Pop. ±% p.a. 1793 223 —     1800 215 −0.52% 1806 242 +1.99% 1821 89 −6.45% 1831 245 +10.66% 1836 267 +1.73% 1841 315 +3.36% 1846 312 −0.19% 1851 296 −1.05% 1856 316 +1.32% 1861 297 −1.23% 1866 264 −2.33% 1872 262 −0.13% 1876 277 +1.40% 1881 265 −0.88% 1886 254 −0.84% 1891 261 +0.55% 1896 256 −0.39%	Year Pop. ±% p.a. 1901 251 −0.39% 1906 204 −4.06% 1911 202 −0.20% 1921 166 −1.94% 1926 145 −2.67% 1931 125 −2.92% 1936 110 −2.52% 1946 103 −0.66% 1954 85 −2.37% 1962 68 −2.75% 1968 52 −4.37% 1975 44 −2.36% 1982 47 +0.95% 1990 64 +3.93% 1999 60 −0.71% 2007 65 +1.01% 2012 76 +3.18% 2017 85 +2.26%
Source: EHESS and INSEE

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:

• A Chalice with Paten (17th century)
• A Ciborium (17th century)
• A Templar door (12th century)

• Communes of the Ariège department

• Arrout on the National Geographic Institute website (in French)
• Arrout official website Archived 11 June 2010 at the Wayback Machine (in French)
• Arrout on Géoportail, National Geographic Institute (IGN) website (in French)
• Arrout on the 1750 Cassini Map