| Kluczbork County | |
| Native Name: | Powiat kluczborski |
| Settlement Type: | County |
| Total Type: | Total |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Opole |
| Area Total Km2: | 851.59 |
| Population As Of: | 2019-06-30[1] |
| Population Total: | 65644 |
| Population Density Km2: | auto |
| Population Urban: | 33043 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 32601 |
| Coor Pinpoint: | Kluczbork |
| Coordinates: | 50.9833°N 31°W |
| Seat: | Kluczbork |
| Parts Type: | Gminas |
| Parts: | Total 4 |
| P1: | Gmina Byczyna |
| P2: | Gmina Kluczbork |
| P3: | Gmina Lasowice Wielkie |
| P4: | Gmina Wołczyn |
| Blank Name: | Car plates |
| Blank Info: | OKL |
| Website: | http://www.powiatkluczborski.pl |
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 41km (25miles) north-east of the regional capital Opole. The county also contains the towns of Wołczyn, lying 120NaN0 west of Kluczbork, and Byczyna, 150NaN0 north of Kluczbork.
The county covers an area of 851.59km2. 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.
| Gmina | Type | Area (km2) | Population (2019) | Seat |
| Gmina Kluczbork | urban-rural | 217.0 | 35,896 | Kluczbork |
| Gmina Wołczyn | urban-rural | 240.9 | 13,579 | Wołczyn |
| Gmina Byczyna | urban-rural | 182.9 | 9,305 | Byczyna |
| Gmina Lasowice Wielkie | rural | 210.8 | 6,864 | Lasowice Wielkie |