Alexander Dubček (; 27 November 1921 – 7 November 1992) was a Slovak politician who served as the First Secretary of the Presidium of the Central Committee of the Communist Party of Czechoslovakia (KSČ) ("de facto" leader of Czechoslovakia) from January 1968 to April 1969. He attempted to reform the communist government during the Prague Spring but was forced to resign following the Warsaw Pact invasion in August 1968.