Kluczbork County (Polish: powiat kluczborski) is a unit of territorial administration and local government (powiat) in Opole Voivodeship, south-western Poland. 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 Kluczbork, which lies 41 kilometres (25 mi) north-east of the regional capital Opole. The county also contains the towns of Wołczyn, lying 12 km (7 mi) west of Kluczbork, and Byczyna, 15 km (9 mi) north of Kluczbork.

Kluczbork County Powiat kluczborski
County
Flag Coat of arms
© SANtosito, CC BY-SA 4.0 Location within the voivodeship
Coordinates (Kluczbork):
Country	Poland
Voivodeship	Opole
Seat	Kluczbork
Gminas	Total 4 Gmina Byczyna Gmina Kluczbork Gmina Lasowice Wielkie Gmina Wołczyn
Area
• Total	851.59 km2 (328.80 sq mi)
Population  (2019-06-30[1])
• Total	65,644
• Density	77/km2 (200/sq mi)
• Urban	33,043
• Rural	32,601
Car plates	OKL
Website	http://www.powiatkluczborski.pl

The county covers an area of 851.59 square kilometres (328.8 sq mi). As of 2019 its total population is 65,644, out of which the population of Kluczbork is 23,554, that of Wołczyn is 5,907, that of Byczyna is 3,582, and the rural population is 32,601.

Kluczbork County is bordered by Kępno County and Wieruszów County to the north, Olesno County to the south-east, Opole County to the south, and Namysłów County to the west.

The county is subdivided into four gminas (three urban-rural and one rural). These are listed in the following table, in descending order of population.