| Radziejów County | |
| Native Name: | Powiat radziejowski |
| Settlement Type: | County |
| Total Type: | Total |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Kuyavian-Pomeranian |
| Area Total Km2: | 607 |
| Population Total: | 40546 |
| Population As Of: | 2019 |
| Population Density Km2: | auto |
| Population Urban: | 10034 |
| Population Blank1 Title: | Rural |
| Population Blank1: | 30512 |
| Coor Pinpoint: | Radziejów |
| Coordinates: | 52.6333°N 49°W |
| Seat: | Radziejów |
| Parts Type: | Gminas |
| Parts: | Total 7 (incl. 1 urban) |
| P1: | Radziejów |
| P2: | Gmina Bytoń |
| P3: | Gmina Dobre |
| P4: | Gmina Osięciny |
| P5: | Gmina Piotrków Kujawski |
| P6: | Gmina Radziejów |
| P7: | Gmina Topólka |
| Blank Name: | Car plates |
| Blank Info: | CRA |
| Website: | http://www.radziejow.pl |
Radziejów County (pl|powiat radziejowski) is a unit of territorial administration and local government (powiat) in Kuyavian-Pomeranian Voivodeship, north-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 Radziejów, which lies 450NaN0 south of Toruń and 640NaN0 south-east of Bydgoszcz. The only other town in the county is Piotrków Kujawski, lying 100NaN0 south of Radziejów.
The county covers an area of 607km2. As of 2019 its total population is 40,546, out of which the population of Radziejów is 5,578, that of Piotrków Kujawski is 4,456, and the rural population is 30,512.
Radziejów County is bordered by Aleksandrów County to the north, Włocławek County to the east, Koło County and Konin County to the south, and Inowrocław County to the north-west.
The county is subdivided into seven gminas (one urban, one urban-rural and five rural). These are listed in the following table, in descending order of population.
| Gmina | Type | Area (km2) | Population (2019) | Seat |
| Gmina Piotrków Kujawski | urban-rural | 138.6 | 9,311 | Piotrków Kujawski |
| Gmina Osięciny | rural | 123.0 | 7,619 | Osięciny |
| Radziejów | urban | 5.7 | 5,578 | |
| Gmina Dobre | rural | 70.8 | 5,372 | Dobre |
| Gmina Topólka | rural | 102.9 | 4,827 | Topólka |
| Gmina Radziejów | rural | 92.6 | 4,366 | Radziejów * |
| Gmina Bytoń | rural | 73.4 | 3,473 | Bytoń |
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