Hajdúnánás (Hungarian: Hajdúnánási járás) is a district in north-western part of Hajdú-Bihar County.

The district is located in the Northern Great Plain Statistical Region.

This district is a part of Hajdúság historical and geographical region.

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

3,000 persons in Hajdúnánás District did not declare their ethnic group at the 2011 census.