Montmagny (French pronunciation: [mɔ̃maɲi] ⓘ) is a commune in the Val-d'Oise department in Île-de-France in northern France.

The north of Montmagny is served by the Deuil - Montmagny station and the south by the Épinay–Villetaneuse station, both on the Transilien Paris-Nord suburban rail network.

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