Day of Restoration of Independence (Azerbaijan), celebrates the independence of Azerbaijan from the Soviet Union in 1991.

The Day of Restoration of Independence is a state holiday in Azerbaijan. It is celebrated annually on October 18. On this day in 1991, the Supreme Soviet of Azerbaijan adopted a Constitutional Act on the Declaration of Independence of Azerbaijan. The declaration was confirmed by a referendum in December 1991.

Azerbaijan, officially the Republic of Azerbaijan, is a transcontinental and landlocked country at the boundary of West Asia and Eastern Europe. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan to the north, Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city.

The Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union, was a transcontinental country that spanned much of Eurasia from 1922 until it dissolved in 1991. During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of national republics, the largest and most populous of which was the Russian SFSR. In practice, its government and economy were highly centralized. As a one-party state governed by the Communist Party of the Soviet Union (CPSU), it was the flagship communist state. Its capital and largest city was Moscow.