| Nowy Tomyśl County | |
| Native Name: | Powiat nowotomyski |
| Settlement Type: | County |
| Total Type: | Total |
| Image Map1: | Mapa powiatu nowotomyskiego.jpg |
| Map Caption1: | Division into gminas |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Greater Poland |
| Area Total Km2: | 1011.67 |
| Population Total: | 71817 |
| Population As Of: | 2006 |
| Population Density Km2: | auto |
| Population Urban: | 34538 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 37279 |
| Coor Pinpoint: | Nowy Tomyśl |
| Coordinates: | 52.3167°N 16.1333°W |
| Seat: | Nowy Tomyśl |
| Parts Type: | Gminas |
| Parts: | Total 6 |
| P1: | Gmina Kuślin |
| P2: | Gmina Lwówek |
| P3: | Gmina Miedzichowo |
| P4: | Gmina Nowy Tomyśl |
| P5: | Gmina Opalenica |
| P6: | Gmina Zbąszyń |
| Blank Name: | Car plates |
| Blank Info: | PNT |
| Website: | https://powiatnowotomyski.pl |
Nowy Tomyśl County (pl|powiat nowotomyski) 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 Nowy Tomyśl, which lies 55km (34miles) west of the regional capital Poznań. The county contains three other towns: Opalenica, 200NaN0 east of Nowy Tomyśl, Zbąszyń, 170NaN0 south-west of Nowy Tomyśl, and Lwówek, 160NaN0 north of Nowy Tomyśl.
The county covers an area of 1011.67km2. As of 2006 its total population is 71,817, out of which the population of Nowy Tomyśl is 15,225, that of Opalenica is 9,104, that of Zbąszyń is 7,300, that of Lwówek is 2,909, and the rural population is 37,279.
Nowy Tomyśl County is bordered by Międzychód County to the north, Szamotuły County to the north-east, Poznań County and Grodzisk Wielkopolski County to the east, Wolsztyn County to the south, Zielona Góra County to the south-west, and Świebodzin County and Międzyrzecz County to the west.
The county is subdivided into six gminas (four 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 Nowy Tomyśl | urban-rural | 185.9 | 24,237 | Nowy Tomyśl |
| Gmina Opalenica | urban-rural | 147.7 | 15,588 | Opalenica |
| Gmina Zbąszyń | urban-rural | 179.8 | 13,469 | Zbąszyń |
| Gmina Lwówek | urban-rural | 183.5 | 9,151 | Lwówek |
| Gmina Kuślin | rural | 106.3 | 5,571 | Kuślin |
| Gmina Miedzichowo | rural | 208.5 | 3,801 | Miedzichowo |