The Första kammaren (literally "First Chamber", often abbreviated 'FK'; referred to in some non-Swedish sources as the Senate[1]) was the upper house of the bicameral Riksdag of Sweden between 1866 and 1970 that replaced the Riksdag of the Estates.

[2] During the bicameral period, the lower house of the Riksdag was the Andra kammaren (literally "the Second Chamber").

[4] During a large portion of the long tenure of power for the Social Democrats (between 1932 and 1976), the party remained in control of legislation thanks to its strong position in the First Chamber.

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.

[6] 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.