| Authion | |
| Pushpin Map: | France Pays de la Loire#France |
| Mouth Coordinates: | 47.4213°N -0.5525°W |
| Subdivision Type1: | Country |
| Length: | 99.8km (62miles) |
| Basin Size: | 1497km2 |
The Authion is a 99.8km (62miles) long river in western France located in the departments of Indre-et-Loire (Centre-Val de Loire) and Maine-et-Loire (Pays de la Loire). It is a tributary of the river Loire on the right side. It flows into the Loire in Sainte-Gemmes-sur-Loire, near Angers. Its longest tributaries are the Lathan and the Couasnon. The largest towns on the Authion are Bourgueil, Mazé-Milon, Brain-sur-l'Authion, Trélazé and Les Ponts-de-Cé. Its basin area is 1497km2.[1]