Zawiercie County (powiat zawierciański) is a unit of territorial administration and local government (powiat) in Silesian Voivodeship, southern 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 Zawiercie, which lies 41 km north-east of the regional capital Katowice. The county contains five other towns: Poręba, 6 km west of Zawiercie, Łazy, 8 km south of Zawiercie, Ogrodzieniec, 9 km south-east of Zawiercie, Szczekociny, 33 km north-east of Zawiercie, and Pilica, 18 km east of Zawiercie.
The county covers an area of 1003.27 km2. As of 2019 its total population is 118,020. The most populated towns are Zawiercie with 49,334 inhabitants and Poręba with 8,525 inhabitants.
Zawiercie County is bordered by Częstochowa County to the north, Włoszczowa County to the north-east, Jędrzejów County and Miechów County to the east, Olkusz County and the city of Dąbrowa Górnicza to the south, Będzin County to the south-west, and Myszków County to the west.
