Radziejów County (Polish: 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.

The only other town in the county is Piotrków Kujawski, lying 10 km (6 mi) south of Radziejów.

The county covers an area of 607 square kilometres (234.4 sq mi).

The county is subdivided into seven gminas (one urban, one urban-rural and five rural).