The dissolution of Czechoslovakia, which took effect on 1 January 1993, was an event that saw the self-determined separation of the federal state of Czechoslovakia. The Czech Republic and Slovakia, entities which had arisen in 1969 within the framework of Czechoslovak federalisation, became immediate subjects of the international law in 1993. It is sometimes known as the Velvet Divorce, a reference to the bloodless Velvet Revolution of 1989 that led to the end of the rule of the Communist Party of Czechoslovakia and the formation of a democratic government.

Czechoslovakia was created with the dissolution of Austria-Hungary at the end of World War I. In 1917, a meeting took place in Pittsburgh, Pennsylvania, where the future Czechoslovak president Tomáš Masaryk and other Czech and Slovak representatives signed the Pittsburgh Agreement which promised a common state consisting of two equal nations, Slovakia and Czechia. Soon after, the philosophy of Edvard Beneš pushed for greater unity and a single nation.