The 3rd constituency of Jász-Nagykun-Szolnok County (Hungarian: Jász-Nagykun-Szolnok 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: Jász-Nagykun-Szolnok 03.

[2] Since 2018, it has been represented by Sándor Kovács of the Fidesz–KDNP party alliance.

The 3rd constituency is located in eastern part of Jász-Nagykun-Szolnok County.

The constituency was first represented by Sándor Fazekas of the Fidesz from 2014 to 2018.