Chaumes-en-Retz (French pronunciation: [ʃom ɑ̃ ʁɛ] ⓘ, literally Chaumes in Retz; Breton: Kalaved-Raez) is a commune in the department of Loire-Atlantique in western France.

The municipality was established on 1 January 2016 by merger of the former communes of Arthon-en-Retz and Chéméré.

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