Namysłów County (Polish: powiat namysłowski) is a unit of territorial administration and local government (powiat) in Opole Voivodeship, south-western 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 only town is Namysłów, which lies 48 kilometres (30 mi) north of the regional capital, which is the city of Opole.

The county covers an area of 747.67 square kilometres (288.7 sq mi).

These are listed in the following table, in descending order of population.