Hajdú-Bihar County 1st constituency

The 1st constituency of Hajdú-Bihar County (Hajdú-Bihar megyei 01. számú országgyűlési egyéni választókerület) is one of the single member constituencies of the National Assembly, the national legislature of Hungary. The constituency standard abbreviation: ''Hajdú-Bihar 01. OEVK''.

Since 2014, it has been represented by Lajos Kósa of the Fidesz–KDNP party alliance.

Geography
The 1st constituency is located in central part of Hajdú-Bihar County.

List of municipalities
The constituency includes the following municipalities: • # Debrecen: Northwestern part of the city.

Members
The constituency was first represented by Lajos Kósa of the Fidesz from 2014, and he was re-elected in 2018 and 2022.