Gniew (pronounced Gnef [ɡɲɛf]; Kashubian: Gméw, or Gniéw; German: Mewe) is a historic town situated on the left bank of the Vistula River, in the Pomeranian Voivodeship, in northern Poland.

It is one of the oldest towns in Eastern Pomerania, and is renowned for its medieval brick gothic Castle, which has become one of the region's most recognizable monuments.

Their claim was formally recognized by Mestwin II of Pomerania in 1282, and the city became the first stronghold of the Teutonic Order on the left riverside of the Vistula.

A castle was built as a result of this important strategic location, and in 1297 the Teutonic Knights gave Gniew town privileges.

In 1440, it joined the anti-Teutonic Prussian Confederation, and upon its request it was re-incorporated to Poland by King Casimir IV Jagiellon in 1454, which was confirmed in the Second Peace of Toruń in 1466.

[6] In the second half of the 17th century, prior to becoming King of Poland, John III Sobieski served as the starost of Gniew and built the "Marysieńka Palace" for his wife, Queen Marie Casimire.

Polish organisations were established and operated here, demonstrations were held and volunteers were secretly recruited for the January Uprising in the Russian Partition.

This date is celebrated in Gniew till today as the anniversary of liberation from Prussian oppression and the end of 148 years of attempts to eradicate its Polish past.