# 60,000,000–72,000,000 - World War II (1939–1945)
# 40,000,000 - Three Kingdoms War of China (190–280)
# 36,000,000 - An Shi Rebellion (756–763)
# 30,000,000–60,000,000 - Mongol Conquests (13th century)
# 25,000,000 - Manchu conquest of Ming China (1616–1644)
# 20,000,000–50,000,000 - Taiping Rebellion (1851–1864)
# 20,000,000 - Second Sino-Japanese War (1931–1945)
# 17,000,000 - Timur's conquests (1370–1405)
# 15,000,000–66,000,000 - World War I (1914–1918) note that the larger number includes Spanish flu deaths
# 10,000,000 - Warring States Era (475 BC–221 BC)
Source