Przasnysz [ˈpʂasnɨʂ] is a town in Poland. Located in the Masovian Voivodship, about 110 km north of Warsaw and about 115 km south of Olsztyn, it's the capital of Przasnysz County. It has 18,093 inhabitants (2004). One of the most important towns in Mazovia during the Middle Ages.