Montreuil-sur-Mer station is a railway station on the line from Arras to Étaples via Saint-Pol-sur-Ternoise. It is located in the commune of Montreuil-sur-Mer in the Pas-de-Calais department, France. The station is served by TER Picardie trains on two lines: Boulogne to Arras, and Boulogne to Lille via Béthune.