| Grodzisk County | |
| Native Name: | Powiat grodziski |
| Settlement Type: | County |
| Total Type: | Total |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Greater Poland |
| Area Total Km2: | 643.72 |
| Population Total: | 49444 |
| Population As Of: | 2006 |
| Population Density Km2: | auto |
| Population Urban: | 18721 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 30723 |
| Coor Pinpoint: | Grodzisk Wielkopolski |
| Coordinates: | 52.2333°N 38°W |
| Seat: | Grodzisk Wielkopolski |
| Parts Type: | Gminas |
| Parts: | Total 5 |
| P1: | Gmina Granowo |
| P2: | Gmina Grodzisk Wielkopolski |
| P3: | Gmina Kamieniec |
| P4: | Gmina Rakoniewice |
| P5: | Gmina Wielichowo |
| Blank Name: | Car plates |
| Blank Info: | PGO |
| Website: | http://www.pgw.pl/ |
Grodzisk County (Polish: powiat grodziski) 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 Grodzisk Wielkopolski, which lies 42km (26miles) south-west of the regional capital Poznań. The county also contains the towns of Rakoniewice, lying 130NaN0 south-west of Grodzisk Wielkopolski, and Wielichowo, 130NaN0 south of Grodzisk Wielkopolski.
The county covers an area of 643.72km2. As of 2006 its total population is 49,444, out of which the population of Grodzisk Wielkopolski is 13,703, that of Rakoniewice is 3,253, that of Wielichowo is 1,765, and the rural population is 30,723.
Grodzisk County is bordered by Poznań County to the east, Kościan County to the south-east, Wolsztyn County to the south-west and Nowy Tomyśl County to the west.
The county is subdivided into five gminas (three urban-rural and two rural). These are listed in the following table, in descending order of population.
| Gmina | Type | Area (km2) | Population (2006) | Seat |
| Gmina Grodzisk Wielkopolski | urban-rural | 134.5 | 18,616 | Grodzisk Wielkopolski |
| Gmina Rakoniewice | urban-rural | 201.2 | 12,515 | Rakoniewice |
| Gmina Wielichowo | urban-rural | 107.4 | 6,894 | Wielichowo |
| Gmina Kamieniec | rural | 132.2 | 6,498 | Kamieniec |
| Gmina Granowo | rural | 68.4 | 4,921 | Granowo |