The State Union of Serbia and Montenegro (Serbian: Државна заједница Србија и Црна Гора / Državna zajednica Srbija i Crna Gora, abbreviated as СЦГ / SCG), was a union of Serbia and Montenegro, which existed between 2003 and 2006. The two republics, both of which are former republics of the SFR Yugoslavia, initially formed the Federal Republic of Yugoslavia in 1992. In 2003, the FRY was reconstituted as a State Union Serbia and Montenegro.
On May 21, 2006, Montenegro held a referendum to seek full independence. Final official results indicated on May 31 that 55.5% of voters had elected to become independent. The state union effectively came to an end after Montenegro's formal declaration of independence on June 3, 2006 and Serbia's formal declaration of independence on June 5. Many view this as symbolizing the final end of what was left from the former Yugoslavia.
A loose confederation, Serbia and Montenegro was a union only in certain political areas (e.g. defence). The states had separate economic policies and currencies. The country did not have a unified capital, dividing its common institutions between Belgrade in Serbia and Podgorica in Montenegro.