The Vistula Lagoon (or Bay, Gulf) (, , ) is a fresh water lagoon on the Baltic Sea which is cut off from Gdańsk Bay by the Vistula Spit. It takes a few branches of Vistula, notably Nogat and Pregolya rivers and is connected to Gdańsk Bay by the Strait of Baltiysk. Politically the Vistula Lagoon is split between Poland and Russia. From 1871 until 1919, it was part of Germany. After 1919 and before 1945 it was split between Germany and the Free City of Danzig.

Localities on the lagoon include Kaliningrad, Baltiysk, and Primorsk in the Kaliningrad Oblast and Frombork in Poland. The Polish port of Elbląg used to have a lot trading traffic on the lagoon, but that has declined owing to the current border situation. Kaliningrad and Baltiysk are currently major seaports on the lagoon.

See also

• Curonian Lagoon

Baltic Sea | Bays of Poland | Bays of Russia | Lagoons

Frisches Haff | Lagune de la Vistule | 비스툴라 석호 | Wislahaf | Zalew Wiślany | Калининградский залив