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:

• Cantal: Murat, Massiac
• Haute-Loire: Lempdes-sur-Allagnon
• Puy-de-Dôme: Beaulieu

Alagnon
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Location
Country	France
Physical characteristics
Source
• location	Massif Central
Mouth
• location	Allier
• coordinates	45°27′5″N 3°18′14″E / 45.45139°N 3.30389°E / 45.45139; 3.30389
Length	86.7 km (53.9 mi)
Basin features
Progression	Allier→ Loire→ Atlantic Ocean

The Alagnon flows into the river Allier at Auzat-la-Combelle.