Rétság (Hungarian: Rétsági járás; Slovak: Rétságsky okres) is a district in 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 Slovak (approx.

500 persons in Rétság District did declare more than one ethnic group at the 2011 census.