The Beneden Merwede is a stretch of river in the Netherlands, the continuation of the Boven Merwede after the branching-off of the Nieuwe Merwede ship canal. It flows from Hardinxveld-Giessendam to Dordrecht, where it splits into the Noord and Oude Maas rivers. Its length is 14.9 km. The Merwede is part of the main shipping route between Rotterdam and Germany.
There is a road bridge and, more to the east, a railroad bridge between the railway stations Dordrecht Stadspolders and Hardinxveld-Giessendam on the line Dordrecht-Gorinchem.