Ten Deadliest Wars of Human History:
10) Russian Civil War, Russia, 1917-1921, lowest estimate: 6,000,000 dead
*9) Dungan Revolt, China, 1862-1877, lowest estimate: 8,000,000 dead
*8) An Lushan Rebellion, China, 755-763, lowest estimate: 13,000,000 dead
*7) Conquest of Timur (Tamerlane--Mongolian leader who sought to re-establish Yuan Dynasty in China), Asia-Russia, 1369-1405, lowest estimate: 15,000,000 dead
6) World War I, Worldwide but mostly Europe, 1914-1918, lowest estimate: 16,000,000 dead
*5) Chinese Civil War (Chinese Communist Revolution), China, 1927-1949, lowest estimate: 17,000,000 dead
*4) Taiping Rebellion, China, 1851-1864, lowest estimate: 20,000,000 dead
*3) Qing Conquest of Ming Dynasty, China, 1616-1662, lowest estimate: 25,000,000 dead
*2) Mongolian-Chinese Conquests, Asia and Europe, 1206-1368, lowest estimate: 30,000,000 dead
1) World War II, Worldwide but mostly Europe and Asia, 1939-1945, lowest estimate: 40,000,000 dead