The Red Army invasion of Azerbaijan, also known as the Sovietization or Soviet invasion of Azerbaijan, took place in April 1920. It was a military campaign conducted by the 11th Army of the Soviet Russia aimed at installing a Soviet government in the Azerbaijan Democratic Republic. The invasion coincided with an anti-government insurrection organized by local Azerbaijani Bolsheviks in the capital city of Baku. As a result, the Azerbaijan Democratic Republic was dissolved, and the Azerbaijan Soviet Socialist Republic was established.
During 1919–1920, Azerbaijan experienced severe political and socio-economic crises, with volatile internal conditions. Armed conflicts occurred between various political and social factions across the country. Since the collapse of Republican Power in 1918, underground organizations consisting of different political parties and socialist groups were active. These factions united with the AC(b)P in February 1920 to coordinate their political objectives.