The Layon (French pronunciation: [lɛjɔ̃] ⓘ) is a 89.9 km (55.9 mi) long river in the Deux-Sèvres and Maine-et-Loire departments in western France.

It is a left tributary of the Loire, into which it flows near Chalonnes-sur-Loire.

This list is ordered from source to mouth:

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