Kunszentmárton (Hungarian: Kunszentmártoni járás) is a district in southern part of Jász-Nagykun-Szolnok County.

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

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

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

5,000 persons in Kunszentmárton District did not declare their ethnic group at the 2011 census.