Spain’s oldest political party has survived civil war, dictatorship, and a century of reinvention.

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Founded in 1879, the Spanish Socialist Workers' Party (PSOE) has anchored Spanish politics for nearly 150 years. From its Marxist origins to its current social democratic identity, the party has navigated the collapse of a republic, decades of clandestine exile, and the complex, shifting landscape of modern European governance.

The PSOE was established by Pablo Iglesias on May 2, 1879, in a Madrid tavern. Initially a Marxist organization, the party spent its early decades building influence through its affiliated trade union, the General Union of Workers (UGT). By the 1930s, the PSOE was a central player in the Second Spanish Republic, though internal divisions between moderate and revolutionary factions intensified as the country polarized. Following the defeat of the Republic in the Spanish Civil War, the party was banned, its leaders were persecuted, and many members fled into exile.

The party’s modern era began in the 1970s. After the death of Francisco Franco, the PSOE emerged from clandestinity and underwent a radical transformation under Felipe González. In 1979, the party officially abandoned its Marxist ideology to embrace social democracy, a move that alienated some traditionalists but positioned the PSOE to dominate Spanish politics. González led the party to a landslide victory in 1982, beginning a long period of governance that saw Spain integrate into the European community and modernize its public services.

Despite its electoral successes, the PSOE has faced significant internal and external challenges. The party has frequently clashed with trade unions over economic policies, including deregulation and privatization. Furthermore, the rise of a fragmented political landscape in the 2010s forced the party to navigate difficult coalition dynamics. Under Pedro Sánchez, who became prime minister in 2018 following a successful motion of no confidence against the conservative government, the party has continued to adapt, balancing its traditional platform with the demands of a changing, multi-party democracy.

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