The Congress of Berlin (13 June – 13 July 1878) was a diplomatic conference to reorganise the states in the Balkan Peninsula after the Russo-Turkish War of 1877–78, which had been won by Russia against the Ottoman Empire. Represented at the meeting were Europe's then six great powers (Russia, Great Britain, France, Austria-Hungary, Italy and Germany), the Ottomans and four Balkan states: Greece, Serbia, Romania and Montenegro.

The leader of the congress, German Chancellor Otto von Bismarck, sought to stabilise the Balkans, reduce the role of the defeated Ottoman Empire in the region, and balance the distinct interests of Britain, Russia and Austria-Hungary. The affected territories were instead granted varying degrees of independence. Romania became fully independent, though was forced to give part of Bessarabia to Russia, and gained Northern Dobruja. Serbia and Montenegro were also granted full independence but lost territory, with Austria-Hungary occupying the Sandžak region along with Bosnia and Herzegovina.