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

Near Numansdorp, the Hollands Diep splits into the Haringvliet and the Volkerak estuaries. It is closed off near Goedereede from the North Sea by the Haringvliet sluices , which provide a road connection between the island of Voorne to the north and the island of Goeree-Overflakkee to the south. The sluices were built as part of the Delta Works sea barrier protection works, and allow for a brackish ecological environment.

The Haringvliet estuary contains the island of Tiengemeten , which is separated from the river island of Hoeksche Waard by the Vuile Gat strait.