The 3rd constituency of Hajdú-Bihar County (Hungarian: Hajdú-Bihar megyei 03. 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 03.

[2] Since 2014, it has been represented by László Tasó of the Fidesz–KDNP party alliance.

The 3rd constituency is located in north-eastern part of Hajdú-Bihar County.

The constituency includes the following municipalities:[3][2] The constituency was first represented by László Tasó of the Fidesz from 2014,[4] and he was re-elected in 2018[5] and 2022.