The Democratic Socialist Alliance (DSA) is a left-wing political organisation in the UK.
The DSA name was adopted for public political work, in June 2005, by a group of members of the Socialist Alliance Democracy Platform (SADP) who declared an intention to continue the SADP against what the DSA claims was a "purported" dissolution of the latter organisation by another group of its members, who reorganised as the Socialist Alliance (SA(P)).
The DSA claims that it holds to the assertion in the SADP's Founding Statement that "the political vacuum to the left of the Labour Party must be filled by socialists working together to build a workers party, which is serious about winning political power. An electoral alliance of autonomous socialist organizations and individuals does not measure up to the needs of the situation". It cites the Scottish Socialist Party, which it describes as a "unitary democratic socialist party with full platform/faction rights", as the organisational model which it desires to emulate.