Deadliest Wars in Human History

Conflicts ranked by estimated total deaths (military and civilian combined). World War II remains the deadliest conflict ever recorded, with estimates ranging from 70–85 million deaths.

Data

#	Conflict	Period	Deaths (millions, est.)
1	World War II	1939–1945	70–85
2	Mongol Conquests	1206–1368	40–60
3	World War I	1914–1918	15–22
4	Second Congo War	1998–2003	3.8–5.4
5	Napoleonic Wars	1803–1815	3.5–6
6	Thirty Years' War	1618–1648	3–11.5
7	Taiping Rebellion	1850–1864	20–30
8	Russian Civil War	1917–1922	7–12
9	Korean War	1950–1953	1.2–3.5
10	Vietnam War	1955–1975	1.3–3.5
11	American Civil War	1861–1865	0.62–0.75
12	Seven Years' War	1756–1763	1.4
13	An Lushan Rebellion	755–763	13–36
14	Three Kingdoms War	184–280	36–40
15	Rwandan Genocide	1994	0.5–0.8

Source: Wikipedia — List of wars by death toll. Estimates vary widely due to historical record limitations. Mid-range estimates used for chart.