The Social Democratic Party of Switzerland (also rendered as Swiss Socialist Party; German: Sozialdemokratische Partei der Schweiz, SP; French: Parti socialiste suisse, PS; Italian: Partito Socialista Svizzero; Romansh: Partida Socialdemocrata de la Svizra) is a political party in Switzerland. It is represented by two Federal Councilors since 1960 and got the second-most votes in the 2015 national elections.
The party was founded on 21 October 1888, and is currently the second largest of the four leading coalition political parties in Switzerland. It is the only left-wing party with representatives in the Swiss Federal Council. It is also the second largest political party in the Swiss parliament. The current members in the Swiss Federal Council are: Alain Berset and Simonetta Sommaruga.
The SP is the largest pro-European party in Switzerland and supports Swiss membership of the European Union, unlike most other Swiss parties. Additionally, it is strongly opposed to capitalism and maintains a long-term goal of "overcoming capitalism." The party is a member of the Progressive Alliance, and an associate member of the Party of European Socialists.