Which nation lost the most soildiers and civilians in the war?

The Soviet Union suffered the highest number of casualties during World War II, with estimates of military and civilian deaths ranging from 20 to 27 million. This staggering loss was a result of extensive battles on the Eastern Front, widespread atrocities, and the brutal conditions of the war. The immense human cost profoundly impacted Soviet society and shaped the nation’s post-war policies and identity.