The Jews.
It is possible Australia suffered the least Battlefield deaths when the port town of Darwin was attacked. Russia suffered the most battlefield deaths, well over 15 million with millions more killed outside of battle.
Russia or China with about 25 million
6 million Jews were lost to the Holocaust.
The Soviet Union with at least 20 Million and as many as 50 million deaths.
The horror of Hitlers dictatorship stands alone in the annals of human cruelty. Under the cover of World War ll he was responsible for 30 million deaths
Could not find the exact number but a beautiful book by the name hanna's suitcase says 1.5 million children died caused by hitlers action alone.
In both wars Russia suffered the most casualties. 2.4 million Russians killed in WW1 and 21.7 million in WW2.
The Jews suffered the most deaths (6 million) but there were 11 million people murdered in the holocause altogether. (Blacks, homosexuals, gypsies, disabled people, homeless people, slovaks, Poles)
germany
Of the 48.2 million deaths from all causes during WWII the Soviet Union suffered the greatest losses in human lives with an estimated 10 million military and 10 million civilian deaths. As a matter of interest, Russia (pre Communist) also suffered the worst losses in WW I.
Of the Allied Powers, Russia suffered the most military deaths, with 2,254,369 total. Of the Central Powers, the German Empire suffered the most military deaths, with 2,037,000 total.
RussiaGermany had the most deaths because they killed all the Jews.They killed around 6 million Jewish people and another 6 million non-Jews in concentration camps.CorrectionRecent estimates indicate that the Soviet Union suffered approximately 26 million civilian deaths due to the Nazi invasion.