Orzysz (English pronunciation Ozis [ˈɔʐɨʂ], German: Arys)[citation needed] is a town in northeastern Poland, in the Pisz County, Warmian-Masurian Voivodeship, with 7,512 inhabitants (2007).

A garrison of the Polish Armed Forces is located in Orzysz, and there is a proving ground near the town.

[1] In 1454, Polish King Casimir IV Jagiellon incorporated the region to the Kingdom of Poland upon the request of the anti-Teutonic Prussian Confederation,[2] and the Thirteen Years' War broke out.

The town, located on a trading route, was granted city rights in 1725 by Frederick William I of Prussia.

[5] The populace remained predominantly Polish by ethnicity[5] and Protestant by confession, and in the late 19th century the local parish was composed of 4,450 Poles and 1,000 Germans.

[1][4] During World War I, several battles were fought between the German and Russian armies in 1914 and 1915 in the area of Arys.

[5][7] On 11 July 1920 the East Prussian plebiscite, mandated by the Versailles Treaty, was held in the District of Allenstein (now Olsztyn), which included Arys.