Notre-Dame-de-la-Mer (French pronunciation: [nɔtʁə dam də la mɛʁ] ⓘ) is a commune in the Yvelines department in the Île-de-France region in north-central France.

It was established on 1 January 2019 by merger of the former communes of Jeufosse (the seat) and Port-Villez.

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