Gostyń County (powiat gostyński) 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 largest town is Gostyń, which lies 59 km south of the regional capital Poznań. The county contains four other towns: Krobia, 11 km south of Gostyń, Poniec, 20 km south-west of Gostyń, Borek Wielkopolski, 17 km east of Gostyń, and Pogorzela, 17 km south-east of Gostyń.
The county covers an area of 810.34 km2. As of 2006 its total population is 75,683, out of which the population of Gostyń is 20,588, that of Krobia is 4,022, that of Poniec is 2,875, that of Borek Wielkopolski is 2,486, that of Pogorzela is 1,974, and the rural population is 43,738.
Gostyń County is bordered by Śrem County to the north, Jarocin County to the east, Krotoszyn County to the south-east, Rawicz County to the south, Leszno County to the west and Kościan County to the north-west.
