Quincy-sous-Sénart (French pronunciation: [kɛ̃si su senaʁ] ⓘ, literally Quincy under Sénart) is a commune in the Essonne department in Île-de-France in northern France.

The palaeographer and archivist Robert Marichal (1904–1999) died in Quincy-sous-Sénart.

Inhabitants of Quincy-sous-Sénart are known as Quincéens in French.

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