Dzierżoniów County (powiat dzierżoniowski) is a unit of territorial administration and local government (powiat) in Lower Silesian 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 is the town of Dzierżoniów, and it also contains four other towns: Bielawa, Niemcza, Pieszyce and Piława Górna. The county covers an area of 478.3 km2.
As at 2019 the total population of the county is 101,118. This figure breaks down as follows: Dzierżoniów 33,239, Bielawa 29,971, Pieszyce 7,123, Piława Górna 6,412, Niemcza 2,965, rural areas 21,408.
Dzierżoniów County is bordered by Świdnica County to the north, Wrocław County to the north-east, Strzelin County to the east, Ząbkowice Śląskie County to the south-east, Kłodzko County to the south and Wałbrzych County to the west.
