Saint-Martin-sous-Montaigu (French pronunciation: [sɛ̃ maʁtɛ̃ su mɔ̃tɛɡy]) is a commune in the Saône-et-Loire department in the region of Bourgogne-Franche-Comté in eastern France.

The vineyards of Saint-Martin-sous-Montaigu are part of the appellation d'origine contrôlée Mercurey.

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