Magnus Johnson was an American politician. He served in the United States Senate and United States House of Representatives from Minnesota as a member of the Farmer–Labor Party. Johnson is the only Swedish-born person to serve in the U.S. Senate.

The Minnesota Farmer–Labor Party (FLP) was a left-wing American political party in Minnesota between 1918 and 1944. The FLP largely dominated Minnesota politics during the Great Depression. It was one of the most successful statewide third party movements in United States history and the longest-lasting affiliate of the national Farmer–Labor movement. At its height in the 1920s and 1930s, FLP members included three Minnesota governors, four United States senators, eight United States representatives and a majority in the Minnesota legislature.