Saint-Cyr-sous-Dourdan (French pronunciation: [sɛ̃ siʁ su duʁdɑ̃] ⓘ, literally Saint-Cyr under Dourdan) is a commune in the Essonne department in Île-de-France in northern France.

Inhabitants of Saint-Cyr-sous-Dourdan are known as Saint-Cyriens.

This Essonne geographical article is a stub.

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