Aydius (French pronunciation: [aidjus];[3][4] Occitan: Aidius) is a commune in the Pyrénées-Atlantiques department in the Nouvelle-Aquitaine region of south-western France.

Sources: Origins: A rock shelter dating from prehistory called Abri Gandon-Lassus has been discovered in the commune.

[12] Paul Raymond noted on page 18 of his 1863 dictionary that the commune had a Lay Abbey, vassal of the Viscounts of Béarn and that in 1385 there were 30 fires and Aydius depended on the bailiwick of Aspe.

The commune has many sites that are registered as historical monuments: Aydie contains a number of high mountains: In his book L'ours et les brebis (The Bear and the sheep), Etienne Lamazou recounted his life as a transhumant shepherd from 1913 to 1969.

All the action takes place in and around Aydius and the book has many thousands of anecdotes sometimes soothing, sometimes moving, and often instructive.