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 was created on January 1, 1999 as a result of the Local Government Reorganization Act of 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 2006 its total population is 145,640, out of which the population of Nysa is 47,283, that of Głuchołazy is 14,887, that of Paczków is 8,147, that of Otmuchów is 5,261, that of Korfantów is 1,883, and the rural population is 68,179.
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.