Debrecen (Hungarian: Debreceni járás) is a district in central part of Hajdú-Bihar County.

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

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

2,000), German (1,300), Romanian (800), Arab (350), Russian and Ukrainian (300), Bulgarian (200), Rusyn, Slovak, Polish, Armenian, Greek and Serb (100).

24,000 persons in Debrecen District did not declare their ethnic group at the 2011 census.