Wolsztyn County (Polish: 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 kilometres (39 mi) south-west of the regional capital Poznań.

The county covers an area of 680.03 square kilometres (262.6 sq mi).

These are listed in the following table, in descending order of population.