The Haringvliet is a large inlet of the North Sea, in South Holland in the Netherlands. It is an important estuary of the Rhine and Meuse River

Near Numansdorp the Hollands Diep splits into the Haringvliet and the Volkerak. It is separated near Goedereede from the North Sea by the Haringvliet Sluices, which provide a road connection between the Voorne-Putten island on the north and the Goeree-Overflakkee island on the south.