Spanish Social Democratic Union

Spanish Social Democratic Union
Unión Social Demócrata Española
Secretary-GeneralDionisio Ridruejo
Founded1974
Dissolved1979
Preceded bySocial Party of Democratic Action
IdeologyLiberal democracy
Social liberalism
Federalism
Political positionCentre
National affiliationDemocratic Convergence Platform
Social Democratic Federation

Spanish Social Democratic Union (Spanish: Unión Social Demócrata Española; USDE) was a social-liberal political party in Spain that opposed the Francoist State and advocated a liberal democracy in Spain. The USDE was founded in 1974 by Dionisio Ridruejo.