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

Arrien is located some 18 km east by north-east of Pau and 5 km west of Séron. Access to the commune is by road D42 from Sedzère in the north passing through the heart of the commune east of the village and continuing south to Eslourenties-Daban. The D145 also comes from Baleix in the north and joins the D42 in the commune then continues south-west to Lourenties. Access to the village (Town Hall) is by the Chemin de l'Eglise going west from the D42 and by other local roads. Apart from some patches of forest on the western border the commune is entirely farmland.

The Canne stream forms the southern border of the commune joining the Gabas at the south-western corner which in turn forms most of the western border of the commune flowing north-west then north eventually joining the Adour near Toulouzette. The Poundets stream forms the eastern border of the commune and flows north to join the Petit Lees near Lombia.

Its name in béarnais is Arrien.

Michel Grosclaude indicated that the origin of the name is obscure and mentioned the possibility of the name of a former owner Ariee.

The following table details the origins of the commune name.

Sources:

Origins: