The New Meuse (Dutch: Nieuwe Maas) is a river branch of the Rhine-Meuse delta in the Netherlands. It runs from the confluence of the rivers Noord and Lek, and flows west through Rotterdam. It ends west of the city where it meets the Old Meuse (Dutch: Oude Maas). The total length is approximately 24 kilometers. The Nieuwe Maas flows through some of the most densely populated and developed areas in the Netherlands. Along its shores are numerous harbours and industries.

