List of wars by death toll

War (outline)
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History Prehistoric Ancient Thermal Gunpowder Timeline Post-classical Castles Early modern Military revolution Pike and shot Napoleonic warfare Late modern Industrial warfare Fourth-gen warfare AI warfare
Military Organization Command and control Defense ministry Army Navy Air force Marines Coast guard Space force Reserves Ranks Specialties: Staff Engineers Intel Recon Medical Police Diving Pilot Land units: Infantry Armor Cavalry Artillery Special forces Signal corps Naval units: 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 Firearms Infantry Loitering Missile Music Nuclear Psychological Radiological Submarine Unconventional
Tactics List of military tactics Aerial Airlift Air assault Airbridge Airdrop Anti-aircraft Anti-sub Anti-tank Battle Cavalry Charge CQC Counterattack Counterinsurgency Convoy 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 Special Operations research Blitzkrieg Expeditionary Deep operation Maneuver Operational manoeuvre group Raid Covert Stay-behind
Strategy List of military strategies and concepts Military campaign Anti-access 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 Order of battle Principles of war Economy of force Medicine Engineers Intelligence Ranks Technology and equipment
Personnel Recruitment Conscription Draft evasion Mobilization Training Specialism Soldier Morale Volunteer Women Children Transgender Harassment Conscientious objector Conscription and sexism Counter-recruitment
Logistics History War economy Arms industry Materiel Supply-chain management Military–industrial complex Base MOB FOB Outpost
Science Power projection Loss-of-strength gradient Lanchester's laws Force multiplication Morale
Law Belligerent Occupation Armistice Ceasefire Court-martial Desertion Geneva Conventions Geneva Protocol Islamic rules Justice Lawful / Unlawful combatant Perfidy Regular / Irregular Jewish laws on war Right of conquest Right of self-defence Rules of engagement Self-determination Martial law War crime War and genocide War treason
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 Wargaming Simulation Exercises Combat effectiveness Center of gravity
Non-warfare Arms control Counter-insurgency Deterrence Disaster response Grey-zone Gunboat diplomacy Humanitarian aid Law enforcement Low-intensity conflict Military engineering Peacekeeping Peacebuilding Peace through strength Show of force
Culture Awards and decorations Battle cry Warrior War film Military science fiction War novel Anti-war movement Foot drill War song Uniform Wargame Militarization / Militarism Antimilitarism Camp follower
Books Seven Military Classics The Art of War De re militari Strategemata
Related Women in war War resister War studies Horses in warfare Wartime sexual violence Fifth column Mercenary Pacifism Privateer Private military company Soldiers are murderers
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 directly or indirectly caused by the deadliest wars in history. These numbers encompass the deaths of military personnel resulting directly from battles or other wartime actions, as well as wartime or war-related civilian deaths, often caused by war-induced epidemics, famines, or genocides. Due to incomplete records, the destruction of evidence, differing counting methods, and various other factors, the death tolls of wars are often uncertain and highly debated. For this reason, the death tolls in this article typically provide a range of estimates.

Compiling such a list is further complicated by the challenge of defining a war. Not every violent conflict constitutes a war; for example, mass killings and genocides occurring outside of wartime are excluded, as they are not necessarily wars in themselves. This list broadly defines war as an extended conflict between two or more armed political groups. Consequently, it excludes mass death events such as human sacrifices, ethnic cleansing operations, and acts of state terrorism or political repression during peacetime or in contexts unrelated to war.