Young Bosnia (Serbo-Croat: ????? ????? / Mlada Bosna) is a term that came into use in the Kingdom of the Serbs, Croats, and Slovenes after World War I to refer to individuals, groups and organizations who favored the violent destruction of Austria-Hungary to make way for unification of the south Slavs with Serbia, the formation of Yugoslavia, or the creation of some other Slavic state.
Two notable organizations are often referred to under the banner Young Bosnia: the "Narodna Odbrana" and the "Black Hand." Dragutin "Apis" Dimitrijevi?, a member of the central committee of the Black Hand and Chief of Serbian Military Intelligence by written statement to the Serbian Court stated that he ordered the assassination of Franz Ferdinand. In the process, he used not only his power over elements of the Serbian military, but also the Black Hand. Leaders of the Black Hand in turn had penetrated the "Narodna Obrana" and used the Narodna organization to infiltrate the arms and assassins into Sarajevo.