This is a list of mass or spree killers. A mass murderer is typically defined as someone who kills 2 or more people in one incident, with no "cooling off" period, not including themself.^[1][2] A mass murder typically occurs in a single location where one or more persons kill several others.^[3][4][5]

Specific notable subtypes of mass murder, including politically motivated crimes, workplace killings, school attacks and familicides, have their own lists.

This list does not include serial killers, members of democidal governments, or major political figures who orchestrated such actions.

Only the first 15 entries are shown here. For the entire list see: List of rampage killers in Africa

Only the first 15 entries are shown here. For the entire list see: List of rampage killers in the Americas and List of rampage killers in the United States

Only the first 15 entries are shown here. For the entire list see: List of rampage killers in Asia and List of rampage killers in China

Only the first 15 entries are shown here. For the entire list see: List of rampage killers in Europe

Only the first 15 entries are shown here. For the entire list see: List of rampage killers in Oceania and Maritime Southeast Asia

Only the first 15 entries are shown here. For the entire list see: List of rampage killers (workplace killings) and List of rampage killers (workplace violence in the military)

Only the first 15 entries are shown here. For the entire list see: List of rampage killers (school massacres)
See also List of school-related attacks

Only the first 15 entries are shown here. For the entire list see: List of rampage killers (religious, political, or ethnic crimes)

Only the first 15 entries are shown here. For the entire list see: List of rampage killers (familicides in Africa), List of rampage killers (familicides in the Americas), List of rampage killers (familicides in Asia), List of rampage killers (familicides in China), List of rampage killers (familicides in Europe), List of rampage killers (familicides in Oceania and Maritime Southeast Asia).

For other incidents in China see: Other incidents

The W-column gives a basic description of the weapons used in the murders

F – Firearms and other ranged weapons, especially rifles and handguns, but also bows and crossbows, grenade launchers, flamethrowers, or slingshots

M – Melee weapons, like knives, swords, spears, machetes, axes, clubs, rods, stones, or bare hands

O – Any other weapons, such as bombs, hand grenades, Molotov cocktails, poison and poisonous gas, as well as vehicle and arson attacks

V – indicates that a vehicle was the only other weapon used

A – indicates that an arson attack was the only other weapon used

E – indicates that explosives of any sort were the only other weapon used

P – indicates that an anaesthetising or deadly substance of any kind was the only other weapon used (includes poisonous gas)

• List of postal killings
• Mass murder
• School shooting
• Spree killer