Mława County (Polish: powiat mławski) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-central Poland.

It came into being on 1 January 1999, as a result of the Polish local government reforms passed in 1998.

Its administrative seat and only town is Mława, which lies 109 kilometres (68 mi) north-west of Warsaw.

The county covers an area of 1,182.3 square kilometres (456.5 sq mi).

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