Siumut (SIU, ; ; ) is a social democratic political party in Greenland. Historically the most dominant party in Greenland, it led governments from the establishment of home rule in 1979 until 2009, and again from 2013 to 2021. Siumut is led by Aleqa Hammond, who succeeded the previous leader Erik Jensen in 2025. Party members have been elected to both the Inatsisartut (or Landstinget, the Parliament of Greenland) and the Folketinget (the Parliament of the Kingdom of Denmark).
History
Siumut was formed in 1971 as a political movement, and became a party in 1977. Following the establishment of home rule in Greenland in January 1979, the party won 13 of 21 seats in the 1979 Greenlandic general election for the newly formed Parliament of Greenland (Inatsisartut), and party chairman Jonathan Motzfeldt became the first Prime Minister of Greenland. Her departure meant Siumut was unrepresented in the Folketing for the first time since 1998. The next month, Siumut suffered an historic defeat at the 2025 general election, winning just four seats and falling to fourth place in the Inatsisartut; the party had never had fewer than nine seats and had never been smaller than the second-largest party in the Inatsisartut. Siumut did ultimately join the Democrats-led governing coalition, which included four of the five parties in the Inatsisartut.
Positions
The party was an observer affiliate of the Socialist International.
Siumut representatives sitting in the Folketinget (the Danish parliament) have been attached to the parliamentary group of the Social Democrats.