60,000,000–85,000,000 – World War II (1939–1945), (see World War II casualties)
40,000,000–70,000,000 – Mongol conquests (1206–1324)[1][2][3][4]
36,000,000–40,000,000 – Three Kingdoms War (184–280)[5][6]
12,000,000 – Eastern Front (1941–1945), (refer to Eastern Front (World War II) casualties)
25,000,000 – Qing dynasty conquest of Ming Dynasty (1616–1662)[7]
20,000,000 – Taiping Rebellion (1850–1864)[8] – may be underestimated
20,000,000 – Second Sino-Japanese War (1937–1945) [9] - Part of World War II
17,000,000 – World War I/Great War (1914–1918) (see World War I casualties)
13,000,000 - An Lushan Rebellion (755–763)[10] – may be underestimated
7,500,000 – Chinese Civil War (1927–1949)[11]
7,000,000–20,000,000 – Conquests of Tamerlane (1370–1405)[12][13]
5,000,000–9,000,000 – Russian Civil War and Foreign Intervention (1917–1922)[14]
8,000,000-10,000,000 - Dungan revolt (1862–77)
3,500,000–6,000,000 – Napoleonic Wars (1803–1815) (see Napoleonic Wars casualties)
3,000,000–11,500,000 – Thirty Years' War (1618–1648)[15]
2,500,000–5,400,000 – Second Congo War/Great War of Africa (1998–2003)[16][17][18][19]
2,000,000–4,000,000 – French Wars of Religion (Huguenot Wars) (1562–1598)[20]
2,000,000 – Shaka's conquests (1816–1828)[21]
1,200,000[22] – Korean War (1950–1953)
873,000[23] – Conquests of Mehmed II 'the Conqueror' (1451-1481) – may either be underestimated or overestimated
800,000–3,800,000[23] – Vietnam War/Second Indochina War (1955–1975)[24][25]
1,000,000–2,000,000 – Mexican Revolution (1910–1920)[26]
1,000,000 – Iran–Iraq War/First Persian Gulf War (1980–1988)[27]
1,000,000 – Japanese invasions of Korea (1592–1598)[28]
1,000,000 Biafra War (1967-1970)