Nysa is a city in southwestern Poland on the Eastern Neisse river, situated in the Opole Voivodeship. With 43,849 inhabitants (2019), it is the capital of Nysa County. It comprises the urban portion of the surrounding Gmina Nysa. Historically the city was part of Upper Silesia.

The Eastern Neisse, also known by its Polish name of Nysa Kłodzka, is a river in southwestern Poland, a left tributary of the Oder, with a length of 188 km and a basin area of 4,570 km2.