Northwest is one of the six multi-member constituencies of the Althing, the national legislature of Iceland. The constituency was established in 2003 following the re-organisation of constituencies across Iceland when the Northwestern constituency was merged with the Western and Westfjords constituencies. Northwest consists of the regions of Northwestern, Western and Westfjords. The constituency currently elects six of the 63 members of the Althing using the open party-list proportional representation electoral system. At the 2024 parliamentary election it had 22,351 registered electors.