Vasiľ Biľak (11 August 1917 – 6 February 2014) was a Slovak Communist politician and leader of Rusyn origin.

Vasiľ Biľak was born in Krajná Bystrá (Hungarian: Bátorhegy), in the Sáros County of the Kingdom of Hungary (present-day Slovakia) in a family of Rusyn ethnicity and was originally a tailor and inseam expert.

From November 1968 until December 1988 he was a secretary of ÚV KSČ with significant influence on the foreign policy and the ideology of the party.

In 1968 he belonged to the exponents of the hardline wing in the KSČ; he supported the Soviet invasion and participated in the so-called "normalization process" after the political liberalization called the Prague Spring.

The Slovak Justice Minister Ján Čarnogurský said in 2001 he would not ask the Slovak President Rudolf Schuster to grant an amnesty to Biľak, the Czechoslovak Communist Party ideologist was charged with treason in connection with the "invitation" sent to Warsaw Pact countries to extend "brotherly help" to Czechoslovakia in 1968.