List of wars with highest cost of causalities/deaths tolls across the world.

This list of wars by death toll includes deaths that are either directly or indirectly caused by war. These numbers include both the deaths of military personnel which are the direct results of battle or other military wartime actions, as well as the wartime/ war-related deaths of civilians, which are the results of war induced epidemics, diseases, famines, atrocities etc.

Two of the ten most highly estimated death tolls, have been waged in the last century. These are of course the two World Wars. Most of the others involved China or neighboring peoples.

Some events overlap categories.