| War | Death range | Date | Combatants | Location | % of global population (rough estimates) |
| World War II | 70–85 million | 1939–1945 | Allied Powers vs. Axis Powers | Global | 3 –3 % |
| Taiping Rebellion | 20–70 million | 1850–1864 | Qing Dynasty vs. Taiping Heavenly Kingdom | China | 1 –2 % |
| Mongol invasions and conquests | 20–60 million | 1206–1368 | Mongol Empire vs. various states in Eurasia | Asia and Europe | 5 –13 % |
| Three Kingdoms | 34 million | 184–280 | Multiple sides but predominantly Cao Wei vs Shu Han vs Eastern Wu | China | 13 –17 % |
| Manchu Conquest of China | 25 million | 1618–1683 | Various, but mainly the Later Jin and Qing Dynasties vs. Ming Dynasty | China | 4 –5 % |
| World War I | 15–22 million | 1914–1918 | Allied Powers vs. Central Powers | Global | 0 –1 % |
| Conquests of Timur | 7–17 million | 1369–1405 | Timurid Empire vs. various states in Asia | Central Asia, West Asia, and South Asia | 1 –5 % |
| An Lushan rebellion | 13 million | 754–763 | Tang Dynasty and Uyghur Khaganate vs. Yan Dynasty | China | 6 % |
| Spanish conquest of Mexico | 10 million | 1519–1530 | Spanish Empire and allies vs. Aztec Empire and allies | Mexico | 2 % |
| Russian Civil War | 7–10 million | 1917–1922 | Multiple sides: Bolsheviks, anti-Bolshevik left, White Movement, Allied and Central Intervention, as well as various separatists | Russia | 0 –0 % |
| Chinese Civil War | 4–9 million | 1927–1949 | Multiple sides, but predominantly Communists vs. Kuomintang | China | 0 –0 % |
| Thirty Years' War | 4 –8 million | 1618–1648 | Anti-Imperial Alliance vs. Imperial Alliance | Europe | 0 –1 % |
| Crusades | 1–9 million | 1095–1291 | Originally Byzantine Empire vs. Seljuk Empire, but evolved into Christians vs. Muslims | Europe and the Middle East | 0 –2 % |
| Spanish conquest of the Inca Empire | 7 million | 1533–1572 | Spanish Empire vs. Inca Empire | South America | 1 % |
| Reconquista | 7 million | 718–1492 | Christian peninsular kingdoms vs. Islamic peninsular kingdoms | Iberian Peninsula | 1 % |
| French Revolutionary and Napoleonic Wars | 4–7 million | 1792–1815 | French Republic, later French Empire, vs. Coalition forces | Europe | 0 –0 % |
| Conquests of Menelik II | 5–6 million | 1878–1904 | Ethiopian Empire vs. Emirate of Harar, Kingdom of Kaffa, Kingdom of Wolaita, and allies | Horn of Africa | 0 % |
| Mahdist War | 4-6 million | 1881-1899 | Mahdist Sudan vs. United Kingdom and allies | Sudan | 0 % |
| Second Congo War | 3–5 million | 1998–2003 | Multiple sides | Democratic Republic of the Congo | 0 –0 % |
| Spanish conquest of New Granada | 5 million | 1525–1540 | Spanish Empire vs. Muisca Confederation and other civilizations | South America | 1 % |
| Deccan wars | 4 –5 million | 1680–1707 | Mughal Empire vs. Maratha Confederacy | South Asia | 0 –0 % |
| Northern Wars | 3 –4 million | 1554–1721 | Multiple sides | Eastern and Northern Europe | 0 –1 % |
| Vietnam War | 1 –4 million | 1955–1975 | North Vietnam and allies vs. South Vietnam and allies | Indochina | 0 –0 % |
| Nigerian Civil War | 3 –4 million | 1967–1970 | Nigeria vs. Biafra | Nigeria | 0 % |
| French Wars of Religion | 2–4 million | 1562–1598 | French catholics vs Huguenots | France | 0 –0 % |
| Korean War | 2 –3 million | 1950–1953 | North Korea and allies vs. South Korea and allies | Korean Peninsula | 0 % |
| Hundred Years' War | 2 –3 million | 1337–1453 | House of Valois vs. House of Plantagenet | Western Europe | 0 –1 % |
| Soviet–Afghan War | 1–3 million | 1979–1989 | Soviet Union and Democratic Republic of Afghanistan vs. Afghan mujahideen | Afghanistan | |
| Delhi Conquest of North India | 0 –3 million | 1300–1310 | Delhi Sultanate vs. North Indian States | South Asia | 0 –0 % |
| Bangladesh Liberation War | 0 million | 1971 | India and Provisional Government of Bangladesh vs. Pakistan | South Asia | |
| Mexican Revolution | 1–2 million | 1910–1920 | Anti-government forces vs. Pro-government forces | Mexico | |
| Fang La Rebellion | 2 million | 1120–1122 | Song Dynasty vs. Fang La rebels | China | 0 –0 % |
| Ethiopian Civil War and Eritrean War of Independence | 1 –2 million | 1961–1991 | EPRDF, later EPLF, vs. Derg and People's Democratic Republic of Ethiopia | Horn of Africa | |
| Russo-Circassian War and Caucasian War | 1 –2 million | 1763–1864 | Circassian Confederation, Principality of Abkhazia, and Caucasian Imamate vs. Russian Empire | Caucasus | |
| Second Sudanese Civil War | 1–2 million | 1983–2005 | Sudan vs. SSPDF | Sudan | |
| Tây Sơn wars | 1–2 million | 1771–1802 | Tây Sơn dynasty vs. Nguyễn lords, Kingdom of Cambodia, Rattanakosin Kingdom, and Kingdom of France | Indochina | |
| Akbar's Conquest of North India | 1–2 million | 1556–1605 | Mughal Empire vs. North Indian States | South Asia | |
| Indian Rebellion of 1857 | 0 –2 million | 1857–1858 | United Kingdom and allies vs. Indian rebels and allies | South Asia | |
| Balkan Wars | 0 –1 million | 1912–1913 | Ottoman Empire vs. Bulgaria, Serbia, Greece, and Montenegro; later Bulgaria vs. Serbia, Greece, Montenegro, and Romania | Balkans | |
| Algerian War | 0 –1 million | 1954–1962 | France vs. Separatists National Liberation Front, Algerian National Movement, and Algerian Communist Party | North Africa | |
| Seven Years' War | 1–1 million | 1756–1763 | Great Britain, Hanover, Prussia, Portugal, and allies vs. France, Habsburg empire, Saxony, Spain, and allies | Global | |
| Warring States period and Qin's wars of unification | 0 –1 million | 475 BCE–221 BCE | Multiple sides | China | 0 –1 % |
| French conquest of Algeria | 0 –1 million | 1830–1903 | France vs. Regency of Algiers, Emirate of Abdelkader, Kingdom of Beni Abbas, and allies | North Africa | |
| Gallic Wars | 0 –1 million | 58 BCE–50 BCE | Roman Republic vs. Gauls and allies | Gaul | 0 –1 % |
| Jewish–Roman wars | 0 –1 million | 66–135 | Roman Empire vs. Judean provisional government | Fertile Crescent | 0 –0 % |
| War of the Spanish Succession | 0 –1 million | 1701–1714 | Habsburg Spain, Great Britain, Holy Roman Empire, and allies vs. Bourboun Spain, Kingdom of France, and allies | Global | |
| Wars of Alexander the Great | 1 million | 336–323 BC | Macedonian Empire vs. Achaemenid Empire and allies | West Asia and Central Asia | |
| Japanese invasions of Korea | 1 million | 1592–1598 | Joseon and Ming dynasty vs. Japan | Korean Peninsula | |
| Panthay Rebellion | 1 million | 1856–1873 | Qing Dynasty vs. Pingnan Guo | China | |
