The Democratic Socialists of America (DSA) is a multi-tendency, democratic socialist political organization in the United States. After the Socialist Party of America (SPA) transformed into Social Democrats, USA, Michael Harrington formed the Democratic Socialist Organizing Committee (DSOC). The DSOC later merged with the New American Movement (NAM) to form the DSA. The organization is headquartered in New York City and has about 80,000 members. It leads organizing and protest campaigns, and has members in the House of Representatives, state legislatures, and other local offices.

Democratic socialism is a left-wing set of political philosophies that supports political democracy and some form of a socially owned economy, with a particular emphasis on economic democracy, workplace democracy, and workers' self-management within a market socialist, decentralised planned, or democratic centrally planned socialist economy. Democratic socialists argue that capitalism is inherently incompatible with the values of freedom, equality, and solidarity and that these ideals can only be achieved through the realisation of a socialist society. Although most democratic socialists seek a gradual transition to socialism, democratic socialism can support revolutionary or reformist politics to establish socialism. Democratic socialism was popularised by socialists who opposed the backsliding towards a one-party state in the Soviet Union and other nations during the 20th century.