Wolsztyn is a town in western Poland, on the western edge of Greater Poland Voivodeship. It is the seat of Wolsztyn County, and of the smaller administrative district of Gmina Wolsztyn.

Greater Poland Voivodeship is a voivodeship, or province, in west-central Poland. It was created on 1 January 1999 out of the former Poznań, Kalisz, Konin, Piła and Leszno Voivodeships, pursuant to the Polish local government reforms adopted in 1998. The province is named after the region called Greater Poland or Wielkopolska. The modern province includes most of this historic region, except for some western parts.