Saint-Ouen-sur-Morin (French pronunciation: [sɛ̃.t‿wɛ̃ syʁ mɔʁɛ̃] ⓘ, literally Saint-Ouen on Morin) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

Inhabitants of Saint-Ouen-sur-Morin are called Andonniens.

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