The June Uprising (Lithuanian: Birelio sukilimas) was a brief period in the history of Lithuania between the first Soviet occupation and the Nazi occupation in late June 1941. Approximately one year earlier, on June 15, 1940, the Red Army occupied Lithuania and the unpopular Lithuanian Soviet Socialist Republic was soon established. Political repression and terror were used to silence its critics and suppress any resistance. When Nazi Germany attacked the Soviet Union on June 22, 1941, a diverse segment of the Lithuanian population rose up against the Soviet regime, declared renewed independence, and formed the short-lived Provisional Government. Two large Lithuanian cities, Kaunas and Vilnius, fell into the hands of the insurgents before the arrival of the Wehrmacht. Within a week, the German Army took control of the whole of Lithuania. The Lithuanians greeted the Germans as liberators from the repressive Soviet rule and hoped that the Germans would re-establish their independence or at least allow some degree of autonomy (similar to the Slovak Republic). No such support came from the Nazis, who steadily replaced Lithuanian institutions with their own administration. The Reichskommissariat Ostland was established at the end of July 1941. Deprived of any real power, the Provisional Government disbanded itself on August 5.

The Lithuanian Activist Front or LAF (Lithuanian: Lietuvių Aktivistų Frontas) was a short-lived, far-right underground resistance organization established in 1940 after Lithuania was incorporated by the Soviet Union. The goal of the organization was to liberate Lithuania and re-establish its independence. It planned and executed the June Uprising and established the short-lived Provisional Government of Lithuania. The Government self-disbanded and LAF was banned by Nazi authorities in September 1941. LAF remains controversial due to its anti-Semitic and anti-Polish positions.