Arthon-en-Retz (French pronunciation: [aʁtɔ̃ ɑ̃ ʁɛ], literally Arthon in Retz; Breton: Arzhon-Raez) is a former commune in the Loire-Atlantique department in western France.

On 1 January 2016, it was merged into the new commune of Chaumes-en-Retz.

[2] Arthon-en-Retz is situated 10 km east of Pornic, 39 km west of Nantes and 41 south of Saint-Nazaire.

The inhabitants are called Arthonnais.

This Loire-Atlantique geographical article is a stub.