The Alagnon (French pronunciation: [alaɲɔ̃]; Occitan: Alanhon), also spelled Allagnon, is an 86.7-kilometre-long (53.9 mi) river in south-central France. It is a left tributary of the river Allier.[1] Its source is near the village of Laveissière, near the Plomb du Cantal in the Massif Central. The Alagnon flows generally northeast through the following departments and towns:
The Alagnon flows into the river Allier at Auzat-la-Combelle.