RANKING

Wars by documented battle casualties

Eastern Front (1941-1945) leads with 26,923,462 – 28,962,918 documented battle casualties across its catalogued engagements.

This ranks the 374 wars with documented casualty estimates, of 812 wars catalogued — showing the top 100.

Every figure is a source-cited range, not a point estimate: rows are ranked on the midpoint but shown as their full low-to-high spread with the confidence grade behind them. Entries with no documented estimate are absent — nothing is imputed to fill a rank. The whole board is reproducible from the open dataset.

Read this firstThis board sums documented BATTLE casualties only. It is not a ranking of total war deaths: it excludes disease, famine, massacres, and civilian tolls, and it counts only the battles the atlas has catalogued for each war. Battle-casualty coverage varies enormously by era, so a modern, well-documented war can outrank a far deadlier ancient one simply because more of its battles carry figures. Read this as 'wars by documented battle casualties in this catalogue', never as a settled 'deadliest wars in history'.

Wars by documented battle casualties
#	War	Documented battle casualties	Confidence	Sources
1	Eastern Front1941-1945	26,923,462 – 28,962,918midpoint ≈ 27,943,190	Medium	—
2	World War I1914–1918 (1917–1918 U.S. combat role)	9,101,777 – 9,819,213midpoint ≈ 9,460,495	Medium	abmc_world_wars, loc_primary_timeline
3	World War II1939–1945 (1941–1945 U.S. combat role)	7,400,058 – 7,820,927midpoint ≈ 7,610,492	Medium	abmc_world_wars, loc_primary_timeline, nara_wwii_docs
4	Napoleonic Wars1803-1815	2,184,194 – 2,285,787midpoint ≈ 2,234,990	Medium	—
5	Second Sino-Japanese War1937-1945	1,916,981 – 2,128,995midpoint ≈ 2,022,988	Medium	—
6	Cold War1945-1991	2,020,709	Medium	—
7	American Civil War1861–1865	1,046,104 – 1,065,049midpoint ≈ 1,055,576	Medium	nara_milestone_docs, nps_civil_war
8	War of the Sixth Coalition1813-1814	948,518 – 972,033midpoint ≈ 960,276	Medium	—
9	Chinese Civil War1927-1950	785,879 – 786,758midpoint ≈ 786,318	Medium	—
10	Gallic War-57--50	707,300 – 710,300midpoint ≈ 708,800	Medium	—
11	Third Carlist War1872-1876	605,749 – 606,149midpoint ≈ 605,949	Medium	—
12	Third Punic War-148--145	450,000 – 750,000midpoint ≈ 600,000	Medium	—
13	Russo-Japanese War1904-1905	461,640 – 464,640midpoint ≈ 463,140	Medium	—
14	Cimbrian War-112--100	430,000 – 470,000midpoint ≈ 450,000	Medium	—
15	First Mithridatic War-88--84	425,000	Medium	—
16	Spanish Civil War1936-1939	356,666 – 400,966midpoint ≈ 378,816	Medium	—
17	Second Punic War-217--200	362,800 – 390,600midpoint ≈ 376,700	Medium	—
18	Sudanese civil war2023	342,000 – 392,000midpoint ≈ 367,000	Medium	—
19	Taiping Rebellion1851-1864	315,000 – 330,000midpoint ≈ 322,500	Medium	—
20	Peninsular War1808-1814	303,621 – 329,526midpoint ≈ 316,574	Medium	—
21	Gulf War1990–1991	234,570 – 374,729midpoint ≈ 304,650	Medium	loc_primary_timeline
22	French invasion of Russia1812	268,366 – 340,498midpoint ≈ 304,432	Medium	—
23	Seven Years' War1756-1763	293,943 – 314,399midpoint ≈ 304,171	Medium	—
24	Greco-Persian Wars-498--448	271,000	Medium	—
25	War of the Second Coalition1798-1802	248,775 – 291,792midpoint ≈ 270,284	Medium	—
26	Franco-Prussian War1870-1871	263,945 – 268,568midpoint ≈ 266,256	Medium	—
27	Arab–Byzantine wars629-1050	240,200 – 280,200midpoint ≈ 260,200	Medium	—
28	Vietnam War1955–1975 broad period; major U.S. combat 1965–1973	254,067 – 256,146midpoint ≈ 255,106	Medium	loc_primary_timeline, nara_postwar_docs
29	Muslim conquest of the Levant633-640	229,000 – 279,000midpoint ≈ 254,000	Medium	—
30	French Revolutionary Wars1792-1802	236,774 – 253,459midpoint ≈ 245,116	Medium	—
31	Syrian Civil War2011	235,470 – 237,992midpoint ≈ 236,731	Medium	—
32	War of the Fifth Coalition1809	229,929 – 242,185midpoint ≈ 236,057	Medium	—
33	Iraqi Civil War of 2014–20172014-2017	225,619 – 228,953midpoint ≈ 227,286	Medium	—
34	Crusades1095-1291	207,500	Medium	—
35	Crimean War1853-1856	201,543 – 206,239midpoint ≈ 203,891	Medium	—
36	War of the Spanish Succession1701-1714	184,868 – 205,705midpoint ≈ 195,286	Medium	—
37	Croatian War of Independence1991-1995	193,309 – 194,202midpoint ≈ 193,756	Medium	—
38	Mongol invasions and conquests1206-1337	186,371 – 191,373midpoint ≈ 188,872	Medium	—
39	Iran–Iraq War1980-1988	177,621 – 188,221midpoint ≈ 182,921	Medium	—
40	War of the First Coalition1792-1797	177,338 – 184,547midpoint ≈ 180,942	Medium	—
41	Farroupilha Revolution1835-1845	180,393	Medium	—
42	Korean War1950–1953 fighting; armistice unresolved	176,015 – 178,759midpoint ≈ 177,387	Medium	loc_primary_timeline, nara_postwar_docs
43	Eighty Years' War1568-1648	160,700 – 186,700midpoint ≈ 173,700	Medium	—
44	Afghanistan War2001–2021 major U.S. war period	161,347 – 165,347midpoint ≈ 163,347	Medium	—
45	First Schleswig War1848-1851	160,875 – 162,260midpoint ≈ 161,568	Medium	—
46	Ottoman Wars in Europe1354-1683	150,820 – 164,520midpoint ≈ 157,670	Medium	—
47	Hungarian Revolution of 18481848-1849	151,353 – 161,652midpoint ≈ 156,502	Medium	—
48	Year of the Four Emperors68-69	143,000 – 153,000midpoint ≈ 148,000	Medium	—
49	Thirty Years' War1618-1648	134,307 – 147,090midpoint ≈ 140,698	Medium	—
50	Ottoman–Hungarian Wars1366-1526	105,000 – 176,000midpoint ≈ 140,500	Medium	—
51	Wars of Alexander the Great-335--322	99,800 – 172,200midpoint ≈ 136,000	Medium	—
52	First Punic War-263--240	123,040 – 148,580midpoint ≈ 135,810	Medium	—
53	Russian Civil War1917-1922	129,911 – 134,026midpoint ≈ 131,968	Medium	—
54	Great Turkish War1683-1699	114,898 – 117,898midpoint ≈ 116,398	Medium	—
55	First Balkan War1912-1913	109,779 – 117,097midpoint ≈ 113,438	Medium	—
56	Muslim conquest of Persia633-654	107,000 – 108,000midpoint ≈ 107,500	Medium	—
57	Reconquista733-1492	100,000	Medium	—
58	European Wars of Religion1524-1697	100,000	Medium	—
59	full-scale Russo-Ukrainian war2022	92,020 – 107,683midpoint ≈ 99,852	Medium	—
60	Seventh Russo-Turkish War1787-1792	98,566 – 99,681midpoint ≈ 99,124	Medium	—
61	War of the Third Coalition1805-1806	92,217 – 103,810midpoint ≈ 98,014	Medium	—
62	Austro-Prussian War1866	92,788 – 94,121midpoint ≈ 93,454	Medium	—
63	Caesar's Civil War-48--44	82,900 – 94,900midpoint ≈ 88,900	Medium	—
64	Gaza War2023	87,991	Medium	—
65	Polish–Soviet War1919-1921	80,358 – 95,508midpoint ≈ 87,933	Medium	—
66	War in the Vendée1793-1796	78,119 – 92,035midpoint ≈ 85,077	Medium	—
67	Russo-Ukrainian War2014	46,916 – 121,586midpoint ≈ 84,251	Medium	—
68	War of the Fourth Coalition1806-1807	78,616 – 85,381midpoint ≈ 81,998	Medium	—
69	War of the Austrian Succession1740-1748	78,087 – 81,587midpoint ≈ 79,837	Medium	—
70	Second Balkan War1913	74,319 – 76,319midpoint ≈ 75,319	Medium	—
71	Romanian War of Independence1877-1878	75,000	Medium	—
72	First Fitna656-661	74,900	Medium	—
73	Ottoman–Mamluk War of 1516–171516-1517	36,000 – 111,000midpoint ≈ 73,500	Medium	—
74	First Indochina War1946-1954	64,102 – 79,797midpoint ≈ 71,950	Medium	—
75	November Uprising1830-1831	69,310 – 74,520midpoint ≈ 71,915	Medium	—
76	Hundred Years' War1337-1453	66,642 – 75,100midpoint ≈ 70,871	Medium	—
77	Roman–Seleucid War-191--187	70,000	Medium	—
78	Paraguayan War1864-1870	66,061 – 66,726midpoint ≈ 66,394	Medium	—
79	insurgency in Khyber Pakhtunkhwa2004	64,980 – 65,202midpoint ≈ 65,091	Medium	—
80	Greek War of Independence1821-1829	64,224	Medium	—
81	American Revolution1775–1783	57,229 – 68,758midpoint ≈ 62,994	Medium	nara_founding_docs, nara_milestone_docs
82	Franco-Dutch War1672-1678	57,760 – 65,360midpoint ≈ 61,560	Medium	—
83	Ottoman–Venetian War of 1570–15731570-1573	45,100 – 77,600midpoint ≈ 61,350	Medium	—
84	Continuation War1941-1944	57,681 – 58,753midpoint ≈ 58,217	Medium	—
85	Greco-Turkish War1919-1922	54,802 – 54,941midpoint ≈ 54,872	Medium	—
86	Long War1593-1606	46,200 – 63,500midpoint ≈ 54,850	Medium	—
87	Soviet–Japanese border conflicts1932-1939	52,490 – 54,448midpoint ≈ 53,469	Medium	—
88	Nine Years' War1688-1697	46,850 – 59,500midpoint ≈ 53,175	Medium	—
89	Winter War1939-1940	51,784 – 52,904midpoint ≈ 52,344	Medium	—
90	War of the League of Cambrai1508-1516	46,730 – 57,430midpoint ≈ 52,080	Medium	—
91	Sino-Vietnamese War1979	51,058	Medium	—
92	Great Northern War1700-1721	45,111 – 56,075midpoint ≈ 50,593	Medium	—
93	Austro-Turkish War of 1716–17181716-1718	50,000	Medium	—
94	First Crusade1096-1099	49,700	Medium	—
95	Finnish Civil War1918	47,550 – 49,550midpoint ≈ 48,550	Medium	—
96	transition from Ming to Qing1616-1683	47,000 – 50,000midpoint ≈ 48,500	Medium	—
97	Mahdist War1881-1899	46,270	Medium	—
98	Egyptian–Wahhabi War1811-1818	44,450 – 44,950midpoint ≈ 44,700	Medium	—
99	War on Terrorism2001-2021	25,405 – 62,805midpoint ≈ 44,105	Medium	—
100	Russo-Turkish Wars1568-1918	43,285	Medium	—

Methodology

This board sums documented BATTLE casualties only. It is not a ranking of total war deaths: it excludes disease, famine, massacres, and civilian tolls, and it counts only the battles the atlas has catalogued for each war. Battle-casualty coverage varies enormously by era, so a modern, well-documented war can outrank a far deadlier ancient one simply because more of its battles carry figures. Read this as 'wars by documented battle casualties in this catalogue', never as a settled 'deadliest wars in history'.

How it’s ranked. the midpoint of each war's summed battle casualties — every casualty-range low and high, across every catalogued battle of that war, summed and averaged. Ties break by start year.

What’s counted. the source-cited casualty ranges attached to each war's battles. A war appears only if at least one of its battles carries a casualty estimate.

What’s excluded. total war mortality — no disease, famine, or civilian deaths, and no battles we have not yet catalogued or that lack a casualty figure. Wars with no documented battle casualties are absent, never imputed.

Coverage. This ranks the 374 wars with documented casualty estimates, of 812 wars catalogued — showing the top 100. Coverage grows as the catalogue is enriched, so ranks can shift between harvests.

The board is computed directly from the catalogue and is reproducible from the public open dataset — see the methodology page for how the underlying figures are sourced and graded. Found an error? Corrections make the data better for everyone.