Szigetszentmiklós (Hungarian: Szigetszentmiklósi járás) is a district in south-western part of Pest County.

Szigetszentmiklós is also the name of the town where the district seat is found.

The district is located in the Central Hungary Statistical Region.

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

9,500 persons in Szigetszentmiklós District did not declare their ethnic group at the 2011 census.