Arnac-sur-Dourdou (French pronunciation: [aʁnak syʁ duʁdu], literally Arnac on Dourdou; Occitan: Arnac) is a commune in the Aveyron department in the Occitanie region of southern France.

Arnac-sur-Dourdou is a sparsely populated commune in the extreme southern corner of Aveyron some 50 km west by north-west of Saint-André-de-Sangonis and 8 km east by north-east of Murat-sur-Vèbre in the heart of the Lacaune mountains.

Access to the commune is by the D92 road from Brusque in the north which is a tortuous mountain road going to the village and continuing west to change to the D162 at the commune border then south to join the D622 to Murat-sur-Vèbre.

[3] [3] Until the French Revolution the Parish of Arnac was part of the community of Brusque.

List of Successive Mayors[4] The inhabitants of the commune are known as Arnacois or Arnacoises in French.