Here's roughly half a billion.
85,000,000 – World War II (1939–1945), (see World War II casualties)
70,000,000 – Mongol conquests (1206–1324)[1][2][3][4]
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]
20,000,000 – Conquests of Tamerlane (1370–1405)[12][13]
9,000,000 – Russian Civil War and Foreign Intervention (1917–1922)[14]
10,000,000 - Dungan revolt (1862–77)
10,000,000[15] – Indian Rebellion of 1857
6,000,000 – Napoleonic Wars (1803–1815) (see Napoleonic
Wars casualties)
11,500,000 – Thirty Years' War (1618–1648)[16]
5,400,000 – Second Congo War/Great War of Africa (1998–2003)[17][18][19][20]
4,000,000 – French Wars of Religion (Huguenot Wars) (1562–1598)[21]
2,000,000 – Shaka's conquests (1816–1828)[22]
1,200,000[23] – Korean War (1950–1953)
873,000[24] – Conquests of Mehmed II 'the Conqueror' (1451-1481) – may either be underestimated or overestimated
800,000–3,800,000[24] – Vietnam War/Second Indochina War (1955–1975)[25][26]
1,000,000–2,000,000 – Mexican Revolution (1910–1920)[27]
1,100,000 Siege of Jerusalem (73).
1,000,000 – Iran–Iraq War/First Persian Gulf War (1980–1988)[28]
1,000,000 – Japanese invasions of Korea (1592–1598)[29]
1,000,000 Biafra War (1967-1970)
957,865–1,622,865 – Soviet war in Afghanistan (1979–1989)[30][31][32]
868,000–1,400,000 – Seven Years' War (1756–1763)[33][34]
618,000 – American Civil War (1861–1865)[35]
500,000 – Spanish Civil War (1936–1939) [36]
400,000–1,000,000 – Gallic Wars (58–50 BC)
400,000+ – First Indochina War (1946–1954)
400,000 – Civil war in Afghanistan (1989–92), Civil war in Afghanistan (1992–96) and Civil war in Afghanistan (1996–2001) (1989–2001)[37]
350,000–1,500,000 - Algerian War of Independence (1954–1962)[38]
350,000 – Third Northern War (1700–1721)[39]
315,000–735,000 – Wars of the Three Kingdoms (1639–1651)[40]
300,000–3,000,000[41] – Bangladesh Liberation War (1971)
300,000 – Second Burundian Civil War (1993–2005)[42]
300,000 (TFG)–500,000+ (AFP) – Somali Civil War[43][44][45]
272,000–1,260,009 – War on Terror (2001–present)[46][47][48]
234,000 – Philippine–American War (1899–1912)[49]
202,354–282,354 – Syrian Civil War (2011–present), see
Casualties of the Syrian civil war
200,000 – Colombian conflict (1964–present) (1964–present)[50]
200,000–1,000,000 – Albigensian Crusade (1208–1259)[51][52]
200,000–500,000 — Lord's Resistance Army insurgency (1987–present)[53]
200,000 – Algerian Civil War (1991–2002)[54][55]
178,258–461,520 – War in Darfur (2003–present)[56]
176,913–1,120,000 – Iraq War/Third Persian Gulf War (2003–2011), see Casualties of the Iraq War, part of the War on Terror[47][48][57]
138,800–320,100 – Iraqi–Kurdish conflict (1918–2003)[58][59]
120,000–384,000 – Great Turkish War (1683–1699) (see Ottoman-Habsburg wars)
120,000 – Islamic insurgency in the Philippines (1969–present)[60]
115,311 – Arab–Israeli conflict (1920–present)[61]
106,800+ – Mexican Drug War (2006–present)[62][63]
100,000–400,000 – Western New Guinea (1984–) (see Genocide in West Papua)
100,000 – Insurgency in Laos (1975–2007)[64]
100,000 – German Peasants' War (1524–1525)[65]
97,000-107,000 – Aceh War (1873–1914)[66]
90,969 – Mahdist War (1881–1889)
90,000+ – Third conflict in the Goryeo–Khitan War (1018–1019)[67]
85,000–235,000 – 1991 uprisings in Iraq (1991)[68][69][70]
80,000–100,000 – Sri Lankan Civil War (1983–2009)[71]
63,500–88,500 – Mozambican War of Independence (1964–1974)[72]
60,000 – Ituri conflict (1999–2007)[73]
47,246–61,603 – War in Afghanistan (2001–present) (2001–present), part of the War on Terror[57]
45,852 – 78,946 – War in North-West Pakistan (2004–present), part of the War on Terror[57]
45,000 – Kurdish–Turkish conflict (1979–2013)[74]