During World War 2 what killed the most civilians?

During World War II, the most civilian deaths resulted from a combination of factors, including direct military actions, genocides, and bombings. The Holocaust led to the systematic extermination of approximately six million Jews, while other groups also faced mass killings. Additionally, large-scale bombings of cities, such as those in Hiroshima and Nagasaki, as well as the firebombing of cities like Dresden and Tokyo, caused significant civilian casualties. Overall, estimates suggest that civilian deaths during the war ranged from 50 to 55 million.