Parliamentary elections are due to be held in Iceland by Saturday 27 September 2025 to elect the 63 members of the Althing.

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Next Icelandic parliamentary election

← 2021 By 27 September 2025

All 63 seats in the Althing 32 seats needed for a majority

Party Leader Current seats Independence Bjarni Benediktsson 17 Progressive Sigurður Ingi Jóhannsson 13 Left-Green Guðmundur Ingi Guðbrandsson 8 Social Democratic Kristrún Frostadóttir 6 People's Inga Sæland 6 Pirates Collective leadership 6 Reform Þorgerður Katrín Gunnarsdóttir 5 Centre Sigmundur Davíð Gunnlaugsson 2 Incumbent Prime Minister Bjarni Benediktsson Independence

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The 63 members of the Althing are elected by open list proportional representation in six multi-member constituencies, with 54 seats distributed between parties at the constituency level with no electoral threshold and 9 leveling seats assigned to party lists at the national level with a threshold of 5 percent required in order to ensure proportionality with the election result.^[3] The 54 constituency seats are distributed within each constituency according to the D'Hondt method.^[4] Election lists are determined by parties; although voters have the option of altering the order of candidates or striking out particular candidates entirely but these rarely have any effect on the result.^[3]

The number of voters per parliamentary seats varies significantly between the constituencies of Iceland. The number of seats per constituency was determined by law in 1999 and is not updated before each election except when the number of voters per each representative in the most represented constituency reaches half the number of voters per each representative in the least represented constituency. The constitution stipulates that in this case, a constituency seat should be transferred from the most represented constituency to the least represented constituency. This has already happened twice since 1999, in both cases transferring a constituency seat from the Northwest constituency to the Southwest constituency. In the 2021 election, the number of eligible voters behind each seat in the Southwest was 5671.5, more than double the 2693.5 eligible voters behind each seat in the Northwest. According to the constitution this means another transfer of a constituency seat from the Northwest to the Southwest before the next parliamentary election.