List of battles by casualties

The following is a list of the casualty count in battles in world history. The list includes both sieges (not technically battles but usually yielding similar combat-related deaths) and civilian casualties during the battles. Large battle casualty counts are almost impossible to calculate precisely. Many of these figures are estimates, and, where possible, a range of estimates is presented. Figures display numbers of all types of casualties when available (killed, wounded, missing, and sick) but may only include number killed. Where possible, the list specifies whether or not prisoners are included in the count. This list does not include most bombing runs or missile strikes (such as the atomic bombings of Hiroshima and Nagasaki), which, despite potentially massive casualties, are not typically classified as "battles," since they are usually one-sided engagements. Tactical or strategic strikes, however, may form part of larger engagements which are themselves battles.

Classical formation battles
These refer to battles in which armies met on a single field of battle and fought each other for anywhere from one to several days. With more advanced weapons, military formations lost their impact and use of this type of battle died out in favor of grander military operations. Many of these battles are ancient, and in several cases, the few extant historical records differ, sometimes wildly, on casualties. Entries here use modern figures when available.

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Sieges and urban combat
This list includes sieges, as well as modern battles that were fought primarily in urban areas. Major military operations that included city fighting are listed below. Sieges and urban combat often include heavy civilian casualties, which are included in this list.

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Major operations
This list includes major operations and prolonged battles or operations fought over a large area or for a long time.