The railway from Épinay-Villetaneuse to Le Tréport-Mers is a French 173-kilometre long railway line, that connects Paris to Le Tréport on the English Channel coast.

The Épinay-Villetaneuse–Le Tréport-Mers railway begins near the Épinay-Villetaneuse station, where it branches off the railway from Paris to Pontoise.

It winds in generally northern direction to the Montsoult-Maffliers station, where the line to Luzarches branches off.

It crosses the river Oise in Persan, and continues in northwestern direction towards Beauvais.

From Aumale it follows the river Bresle downstream until it reaches its terminus Le Tréport-Mers station, near the beach resort towns Le Tréport and Mers-les-Bains.