World War II: At least 38 civilians were killed and about a dozen others injured when the Polish village of Koniuchy was attacked by a Soviet partisan unit with a contingent of Jewish partisans.

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

Kaniūkai is a village in the Šalčininkai district municipality of Lithuania. According to the 2011 census, its population was 125.

The Koniuchy massacre or the Kaniūkai massacre was a World War II massacre of civilians, mostly women and children, carried out in the village of Koniuchy on 29 January 1944 by a Soviet partisan unit together with a contingent of Jewish partisans under Soviet command. At least 38 civilians who have been identified by name were killed, and more than a dozen were injured. In addition, houses were burned and livestock was slaughtered. It was the largest atrocity committed by the Soviet partisans in present-day Lithuania.

Soviet partisans were members of resistance movements that fought a guerrilla war against Axis forces during World War II in the Soviet Union, the previously Soviet-occupied territories of interwar Poland in 1941–45 and eastern Finland. The activity emerged after Nazi Germany's Operation Barbarossa was launched from mid-1941 on. It was coordinated and controlled by the Soviet government and modeled on that of the Red Army.