The Första kammaren (lit. First Chamber, often abbreviated 'FK'), was the upper house of the bicameral Riksdag of Sweden between 1866 and 1970 that replaced the Riksdag of the Estates. During the bicameral period, the lower house of the Riksdag was the Andra kammaren. Both chambers had generally similar and parallel powers.
At the time of its abolition the First Chamber had 151 members, who were elected for eight-year terms of office, from amongst the county councils (landsting) and city councils (stadsfullmäktige); members of the county and city councils were themselves elected directly by the vote of the general public.
During a large portion of the long tenure of power for the social-democratic (between 1932-1976), the party remained in control of legislation thanks to its strong position in the first chamber. If the two chambers made contradictory decisions in budgetary matters, they were required to meet in joint assembly to make a "coherent" decision on the issue. In other matters, no legislative outcomes could be established if the two houses were in disagreement, but issues could re-addressed by submitting a new proposal. Co-ordination between the two chambers was facilitated by the fact that the Riksdag had standing joint committees composed of members from both chambers. This is rare for two chamber systems, which generally only employ temporary joint mediation committees to resolve a dispute between the chambers, or reserve standing joint committees for very narrow functions.