List of wars by death toll

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War (outline)
History Prehistoric Ancient Post-classical castles Early modern pike and shot napoleonic Late modern industrial fourth-gen
Military Organization Command and control Defense ministry Army Navy Air force Marines Coast guard Space force Reserves Regular / Irregular Ranks Standing army / Militia Specialties: Staff Engineers Intelligence Reconnaissance Medical Military police Land units: Infantry Armor Cavalry Artillery Special forces Signal corps Naval units: Frogman Warships Submarines Aircraft carriers Landing craft Auxiliary ships Air units: Fighters Bombers Command Close air support Electronic-warfare Reconnaissance Combat systems: Fire-control system Fire-control radar Director (military) Combat information center Sonar Radar Historical: Ship gun fire-control Gun data computer Torpedo data computer Development: Basic training Military manoeuvrers Combat training
Battlespace Aerospace Aerial Airborne Space Land Cold-region Desert Fortification Jungle Mountain Urban Subterranean Tunnel Sea Amphibious Blue Brown Green Surface Underwater Seabed Cyber Information
Weapons Air defence Armor Artillery Barrage Biological Camouflage Cavalry Horses Air cavalry Chemical Combined arms Conventional Cyber Denial Disinformation Drone / Robot Electromagnetic Infantry Loitering Missile Music Nuclear Psychological Radiological Unconventional
Tactics List of military tactics Aerial Airlift Air assault Airbridge Airdrop Battle Cavalry Charge Counterattack Counterinsurgency Defeat in detail Foxhole Drone Envelopment Formation Guerrilla Naval Rapid dominance Encirclement Investment Siege Swarm Screen Tactical objective Target saturation Trench Withdrawal
Operational Military operation Operations research Blitzkrieg Expeditionary Deep operation Maneuver Operational manoeuvre group Raid Covert
Strategy List of military strategies and concepts Military campaign Attrition Commerce raiding Counter-offensive Culminating Defence in depth Fabian Empty fort Mosaic Deception Defensive Depth Goal Nuclear Naval Offensive Scorched earth
Grand strategy Asymmetric Blockade Broken-backed Class Cold war Colonial Conquest Containment Divide and conquer Economic Endemic Fleet in being Irregular Liberation Limited Network-centric New generation Perpetual Political Princely Proxy Religious Resource Strategic Succession Technology Theater Total war World war
Administrative Branch Policy Staff Training Service Sociology
Organization Area of responsibility Chain of command Command and control Doctrine Principles of war Economy of force Medicine Engineers Intelligence Ranks Technology and equipment
Personnel Recruitment counter Conscription Mobilization Training Specialism Morale Women Children Transgender Harassment Conscientious objector Volunteer foreign Mercenary Soldier / Warrior
Logistics History War economy Military–industrial complex Arms industry Materiel Supply-chain management Base MOB FOB Outpost
Science Power projection Loss-of-strength gradient Lanchester's laws Force multiplication
Law Armistice Ceasefire Court-martial Desertion Geneva Conventions Geneva Protocol Islamic rules Justice Perfidy Jewish laws on war Right of conquest Rules of engagement Martial law War crime Penal military unit
Theory Air supremacy Appeasement Command of the sea Deterrence theory Full-spectrum dominance Overmatch Unrestricted Warfare Just war theory Principles of war Philosophy of war Security dilemma Tripwire force War games
Non-warfare Arms control Counter-insurgency deterrence Disaster response Grey-zone Gunboat diplomacy Humanitarian aid Law enforcement Low-intensity conflict Military engineering Multilateralism Peacekeeping Peacebuilding Peace through strength Show of force
Culture Awards and decorations Battle cry Warrior caste War film Military science fiction War novel Anti-war movement Foot drill War song Uniform Wargame
Related Women in war War resister War studies Horses in warfare Wartime sexual violence Fifth column
Lists Battles Military occupations Military terms Operations Sieges War crimes Wars Weapons Writers
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This list of wars by death toll includes all deaths that are either directly or indirectly caused by war. These numbers include the deaths of military personnel which are the direct results of a battle or other military wartime actions, as well as wartime/war-related deaths of civilians which are often results of war-induced epidemics, famines, genocide, etc. Due to incomplete records, the destruction of evidence, differing methods of counting, and various other reasons, death tolls of wars have often been quite uncertain, and heavily debated.

While the definition of war isn't entirely clear-cut, there is a general understanding of what it is. Merriam-Webster defines war as "a state of usually open and declared armed hostile conflict between states or nations",^[1] Oxford English Dictionary defines war as "hostile contention by means of armed forces, carried on between nations, states, or rulers, or between parties in the same nation or state; the employment of armed forces against a foreign power, or against an opposing party in the state",^[2] and Encyclopædia Britannica defines war as "a conflict between political groups involving hostilities of considerable duration and magnitude".^[3]