The Volkerak is a body of water in the Netherlands. It is part of the Rhine–Meuse–Scheldt delta, and is situated between the island Goeree-Overflakkee to the north-west and the Dutch mainland to the south and east. The western part of the Volkerak is also called Krammer.
Tributaries of the Volkerak are the Dintel and Steenbergse Vliet. The Volkerak is navigable by sea-going ships through the Volkerak Locks (Volkeraksluizen) from the Hollands Diep. The Scheldt–Rhine Canal connects it to the port of Antwerp.
Due to the low supply of fresh water to the now-enclosed Volkerak, and runoff of agricultural nutrients, the lake suffers from algal bloom throughout the summer, and swimming is prohibited. The decision to transform it again into a salt water lake could be taken between 2015 and 2020.