Gavray-sur-Sienne (French pronunciation: [ɡavʁɛ syʁ sjɛn]) is a commune in the Manche department in north-western France.

It was established on 1 January 2019 by merger of the former communes of Gavray (the seat), Le Mesnil-Amand, Le Mesnil-Rogues and Sourdeval-les-Bois.

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