The Social Democratic Party of Catalonia (Catalan: Partit Social Demòcrata de Catalunya, also Partit Socialdemòcrata de Catalunya, PSDC) was a political party in Catalonia, led by Jaume Casanovas and defining itself as left liberal, that split from Democratic Left of Catalonia (EDC) in April 1976 over leadership rather than ideological disagreements.

The party would join the Spanish Social Democratic Federation of Francisco Fernández Ordóñez and José Ramón Lasuén.

[1][2] The PSDC was founded by members of the Democratic Left of Catalonia (EDC) leaving the party in April 1976 under Jaume Casanovas, which had been one of EDC's founders and leaders before disagreements over the political leadership of the party resulted in the PSDC's split.

[4] In May 1977, the party had planned to coalesce into the Union of the Democratic Centre in Catalonia alliance together with the People's Party of Catalonia (PPC) ahead of the 1977 Spanish general election,[5][6][7] but the attempt was aborted by Prime Minister Adolfo Suárez,[2] who instead enforced an electoral list made of independents and without the involvement of the PPC and the PSDC.

[9][10] In March 1978, most party members would leave to join the Union of the Centre of Catalonia, with the remainder of the party joining into a coalition with Republican Left of Catalonia (ERC) and the National Front of Catalonia (FNC) for the March 1979 general election, maintaining the alliance for the April local elections.