Wolsztyn County (powiat wolsztyński) is a unit of territorial administration and local government (powiat) in Greater Poland Voivodeship, west-central 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 only town is Wolsztyn, which lies 63 km south-west of the regional capital Poznań.
The county covers an area of 680.03 km2. As of 2006 its total population is 54,718, out of which the population of Wolsztyn is 13,557 and the rural population is 41,161.
Wolsztyn County is bordered by Nowy Tomyśl County to the north, Grodzisk Wielkopolski County to the north-east, Kościan County to the east, Leszno County to the south-east, Wschowa County to the south, Nowa Sól County to the south-west and Zielona Góra County to the west.
