Nysa County (Polish: powiat nyski) is a unit of territorial administration and local government (powiat) in Opole Voivodeship, south-western Poland, on the Czech border. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Nysa, which lies 48 kilometres (30 mi) south-west of the regional capital Opole. The county contains four other towns: Głuchołazy, 18 km (11 mi) south of Nysa, Paczków, 24 km (15 mi) west of Nysa, Otmuchów, 12 km (7 mi) west of Nysa, and Korfantów, 20 km (12 mi) east of Nysa.
The county covers an area of 1,223.87 square kilometres (472.5 sq mi). As of 2019 its total population is 136,393. The most populated towns are Nysa with 43,849 inhabitants, Głuchołazy with 13,534 inhabitants, and Paczków with 7,460 inhabitants.
The county is subdivided into nine gminas (five urban-rural and four rural). These are listed in the following table, in descending order of population.