2011 Portuguese legislative election

The 2011 Portuguese legislative election was held on 5 June, to elect all 230 members of the Assembly of the Republic. Pedro Passos Coelho led the centre-right Social Democratic Party to victory over the Socialist Party, led by incumbent Prime MinisterJosé Sócrates. Despite a low turnout of less than 60 percent of registered voters, the right-wing won a clear mandate, winning nearly 130 MPs, more than 56 percent of the seats, and just over 50 percent of the vote. While the People's Party, continuing the trend they began in 2009, achieving their best score since 1983, the Social Democrats result exceeded opinion poll forecasts. Of the twenty districts of the country, Pedro Passos Coelho's party won seventeen, including Lisbon, Porto, Faro, Portalegre, Castelo Branco, Coimbra, Santarém and the Azores, that tend to favor the Socialist Party.

The defeat of the PS was severe, as they lost in eleven districts and fell below 30 percent of the votes cast, a first since the election of 1991. This heavy defeat led José Sócrates to resign as General Secretary of the party on election night. However, it was not the Socialists' worst result, which dated back to 1987 when they polled 30 points behind the Social Democrats. The Socialists were also beaten in José Sócrates district, Castelo Branco, that he dominated since 1995.

For the left-wing parties, the result was mixed. On one hand, the Left Bloc faced a huge setback, losing half of its MPs and regaining its 2005 numbers, where they obtained however, one more percentage point in a context of greater participation. As a whole, the Portuguese left-wing parties trails by ten points to the right-wing parties, the biggest lead since the absolute majority of the Social Democrat Aníbal Cavaco Silva in the 1990s.

Voter turnout was one of the lowest in Portuguese election history, with just 58 percent of the electorate casting their ballot on election day.