|website = (www.psd.pt )
|seats1_title = Assembly of the Republic
|seats2_title = European
|seats3_title = Regional
|seats4_title = Local
The Social Democratic Party ((ポルトガル語:Partido Social Democrata) ), is a liberal-conservative and liberal political party in Portugal. It is commonly known by its initials, PSD; on ballot papers, its initials appear as PPD/PSD, with the first three letters coming from the party's original name.
The party was founded as the Democratic People's Party (''Partido Popular Democrata'', PPD) in 1974, two weeks after the Carnation Revolution. In 1979, it allied with centre-right parties to form the Democratic Alliance, and won that year's election. After the 1983 election, the party formed a grand coalition with the Socialist Party (PS), known as the Central Bloc, before winning the election under new leader Aníbal Cavaco Silva in 1985. Cavaco Silva served as Prime Minister for ten years, instituting major economic liberalisation and winning two landslide victories. After he stepped down, the PSD lost the 1995 election. The party was returned to power under José Manuel Durão Barroso in 2002, but was defeated in the 2005 election. The current leader, Pedro Passos Coelho, was elected on 26 March 2010, and became Prime Minister about a year later. The party won a plurality in the 2015 legislative election, winning 107 seats in Assembly of the Republic in alliance with the People's Party (CDS-PP).
Originally a party of social democracy, the PSD became over time the major party of the centre-right in Portugal, being the rival of the Socialist Party on the centre-left.〔 The PSD is a member of the European People's Party (EPP) and the Centrist Democrat International. Until 1996 the PSD belonged to the European Liberal Democrat and Reform Party (ELDR) and the Liberal International.〔
The party publishes the weekly ''Povo Livre'' (''Free People'') newspaper.
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