Balassagyarmat (Hungarian: Balassagyarmati járás) is a district in north-western part of Nógrád County.

The district is located in the Northern Hungary Statistical Region.

(ordered by population, as of 1 January 2013)[1] The bolded municipality is the city.

Besides the Hungarian majority, the main minorities are the Roma (approx.

2,500 persons in Balassagyarmat District did not declare their ethnic group at the 2011 census.