Susz [suʂ] (German: Rosenberg in Westpreußen) is a town in Iława County, Warmian-Masurian Voivodeship, in northern Poland, with 5,610 inhabitants (2006).

In 1454, King Casimir IV Jagiellon incorporated the town and the surrounding region to the Kingdom of Poland upon the request of the Prussian Confederation,[1] and, after the subsequent Thirteen Years' War, from 1466 it was part of Poland as a fiefdom held by the Teutonic Order,[2] which in 1525 was secularized as the Duchy of Prussia.

In October 1831, various Polish infantry units of the November Uprising stopped in the town on the way to their internment places.

[4][5][6] After World War I and the re-establishment of independent Poland, during the ongoing Polish-Soviet War, a plebiscite was held in parts of East Prussia and West Prussia on 11 July 1920 to determine whether the region was to remain in Germany or join the Second Polish Republic.

During World War II, from 26 October 1939 until 1945, Rosenberg was part of Regierungsbezirk Marienwerder in Reichsgau Danzig-West Prussia.