Arnos (French pronunciation: [aʁnɔs]; Occitan: Arnós) is a commune in the Pyrénées-Atlantiques department in the Nouvelle-Aquitaine region of south-western France.

Arnos is located some 25 km north-west of Pau and 10 km east of Arthez-de-Béarn. Access to the commune is by road D276 from Castillon in the west passing through the commune and the village and continuing south-east then east to join the D945. There is a large Formula 3 racetrack in the south of the commune run by the Moto Club Pau-Arnos. The commune consists of farmland except for a few small patches of forest.

The river Aubin, a tributary of the Luy de Béarn (Adour basin), flows through the commune.

The name Arnos appears in the form Arnas on the Cassini Map.

In the 16th century, Arnos was an annex of Boumourt.

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

List of Successive Mayors

From	To	Name
1832	1852	Henri Pétrou
1995	2001	André Bourdieu
2001	2026	Alain Pédegert

Arnos is part of four inter-communal structures:

• the Communauté de communes de Lacq-Orthez;
• the Water and sanitation association of Trois Cantons ;
• the Energy association of Pyrénées-Atlantiques ;
• the inter-communal association of Arthez-de-Béarn.

The inhabitants of the commune are known as Arnosiens or Arnosiennes in French.

Historical population

Year Pop. ±% p.a. 1793 252 —     1800 204 −2.97% 1806 243 +2.96% 1821 290 +1.19% 1831 302 +0.41% 1836 254 −3.40% 1841 241 −1.05% 1846 259 +1.45% 1851 231 −2.26% 1856 226 −0.44% 1861 200 −2.41% 1866 187 −1.34% 1872 198 +0.96% 1876 191 −0.90% 1881 186 −0.53% 1886 189 +0.32% 1891 175 −1.53% 1896 160 −1.78%	Year Pop. ±% p.a. 1901 158 −0.25% 1906 153 −0.64% 1911 155 +0.26% 1921 119 −2.61% 1926 118 −0.17% 1931 115 −0.51% 1936 106 −1.62% 1946 99 −0.68% 1954 100 +0.13% 1962 71 −4.19% 1968 74 +0.69% 1975 63 −2.27% 1982 70 +1.52% 1990 68 −0.36% 1999 68 +0.00% 2007 67 −0.19% 2012 80 +3.61% 2017 113 +7.15%
Source: EHESS and INSEE

The racing Circuit Pau-Arnos is in the south of the commune.

• Communes of the Pyrénées-Atlantiques department

• Arnos on the Community of communes of Arthez-de-Béarn website (in French)
• Arnos on Géoportail, National Geographic Institute (IGN) website (in French)
• Arnas on the 1750 Cassini Map