Year
|
Conflict
|
Casualties
|
Battle
|
1941-1944
|
World War II
|
5.5 Million
|
Siege of Leningrad
|
1942-1943
|
World War II
|
2.5 Million
|
|
1258
|
Mongol invasions and conquests
|
2 Million
|
Siege of Baghdad
|
1945
|
World War II
|
1.3 Million
|
Battle of Berlin
|
1221
|
Mongol conquest of the Khwarazmian Empire
|
1.2 Million
|
Siege of Gurganj
|
1941
|
World War II
|
761,783
|
Battle of Kyiv
|
1942
|
World War II
|
662,847
|
First Battle of Voronezh
|
1614-1615
|
Edo Period
|
500,000
|
Siege of Osaka
|
1945
|
World War II
|
500,000
|
Battle of Manila
|
1948
|
Chinese Civil War
|
425,000
|
Siege of Changchun
|
1944–1945
|
World War II
|
422,000
|
Siege of Budapest
|
87–86 BC
|
First Mithridatic War
|
400,000
|
Siege of Athens and Piraeus
|
1937
|
World War II
|
398,800
|
Battle of Shanghai
|
1871
|
Franco-Prussian War
|
332,142
|
Siege of Paris
|
1914
|
World War I
|
253,000
|
Siege of Przemyśl
|
1521
|
Spanish conquest of Aztec Empire
|
240,000
|
Siege of Tenochtitlan
|
1945
|
World War II
|
240,000
|
Battle of Okinawa
|
1941–1942
|
World War II
|
236,437
|
Second Siege of Sevastopol
|
1854–1855
|
Crimean War
|
218,900
|
First Siege of Sevastopol
|
1944-1945
|
World War II
|
218,900
|
Battle of the Bulge
|
52 BC
|
Gallic Wars
|
200,000
|
Siege of Alesia
|
1937
|
World War II
|
200,000
|
Battle of Xinkou
|
1944
|
World War II
|
200,000+
|
Warsaw Uprising
|
717–718
|
Arab-Byzantine Wars
|
170,000
|
Siege of Constantinople
|
2022-
|
Russo-Ukrainian War
|
160,000+
|
Battle of Bakhmut
|
|
Year
|
Conflict
|
Casualties
|
Battle
|
1700
|
Hill States-Sikh Wars
|
150,000+
|
First Siege of Anandpur
|
1648–1669
|
Cretan War
|
149,739
|
Siege of Candia
|
1076
|
Lý-Song War
|
140,000
|
Siege of Yongzhou
|
1941
|
World War II
|
133,813
|
Siege of Odessa
|
1937
|
World War II
|
130,000
|
Battle of Taiyuan
|
1941
|
World War II
|
120,000+
|
Battle of South Shanxi
|
1943
|
World War II
|
115,830
|
Battle of West Hubei
|
1601–1604
|
Eighty Years' War
|
115,000
|
Siege of Ostend
|
1864
|
Taiping Rebellion
|
100,000
|
Third Battle of Nanking
|
1904-1905
|
Russo-Japanese War
|
100,000
|
Siege of Port Arthur
|
1943
|
World War II
|
100,000
|
Battle of Changde
|
1912–1913
|
First Balkan War
|
93,282
|
Siege of Adrianople
|
1099
|
First Crusade
|
90,000
|
Siege of Jerusalem
|
1099-1102
|
First Crusade
|
90,000
|
Siege of Tripoli
|
1940
|
World War II
|
88,000
|
Battle of Dunkirk
|
2022
|
Russo-Ukrainian War
|
85,200
|
Siege of Mariupol
|
1987
|
Iran–Iraq War
|
85,000
|
Siege of Basra
|
1942
|
World War II
|
84,862
|
Third Battle of Changsha
|
1939
|
World War II
|
80,000+
|
First Battle of Changsha
|
1939
|
World War II
|
75,328
|
Battle of Nanchang
|
1877
|
Russo-Turkish War (1877–1878)
|
75,000
|
Siege of Plevna
|
1097-1099
|
First Crusade
|
74,000
|
Siege of Antioch
|
2016-2017
|
War in Iraq (2013–2017)
|
71,355
|
Battle of Mosul
|
1864–1865
|
American Civil War
|
70,000
|
Siege of Petersburg
|
1808-1809
|
Peninsular War
|
64,000
|
Second Siege of Zaragoza
|
|