Pruszków County (Polish: powiat pruszkowski) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-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 Pruszków, which lies 15 kilometres (9 mi) west of Warsaw.

The county covers an area of 246.31 square kilometres (95.1 sq mi).

The county is subdivided into six gminas (two urban, one urban-rural and three rural).