The June deportation (Estonian: juuniküüditamine, Latvian: jūnija deportācijas, Lithuanian: birželio trėmimai) was a mass deportation by the Soviet Union of tens of thousands of people from the territories occupied in 1940–1941: Estonia, Latvia, Lithuania, occupied Poland (mostly present-day western Belarus and western Ukraine), and Moldavia.

Black Ribbon Day marks the anniversary of the Molotov–Ribbentrop Pact between the Soviet Union and Nazi Germany. The pact and its secret protocols divided Eastern Europe into spheres of influence and led to the occupation of the Baltic states in 1940.