The Supreme National Tribunal was a war-crime tribunal active in communist-era Poland from 1946 to 1948. Its aims and purpose were defined by the State National Council in decrees of 22 January and 17 October 1946 and 11 April 1947. The new law was based on an earlier decree of 31 August 1944 issued by the new Soviet-imposed Polish regime, with jurisdiction over "fascist-Hitlerite criminals and traitors to the Polish nation". The Tribunal presided over seven high-profile cases involving a total of 49 individuals.

The occupation of Poland by Nazi Germany and the Soviet Union during World War II (1939–1945) began with the Invasion of Poland in September 1939, and it was formally concluded with the defeat of Germany by the Allies in May 1945. Throughout the entire course of the occupation, the territory of Poland was divided between Nazi Germany and the Soviet Union (USSR), both of which intended to eradicate Poland's culture and subjugate its people. In the summer-autumn of 1941, the lands which were annexed by the Soviets were overrun by Germany in the course of the initially successful German attack on the USSR. After a few years of fighting, the Red Army drove the German forces out of the USSR and crossed into Poland from the rest of Central and Eastern Europe.