This is a list of the most notable mass shootings in the United States that have occurred since 1900.
Detailed lists of mass shootings can be found per year at their respective pages.
The Gun Violence Archive, a nonprofit research group that tracks shootings and their characteristics in the United States, defines a mass shooting as an incident in which four or more people, excluding the perpetrator(s), are shot in one location at roughly the same time,[3] with the FBI having a minimum of three.
[6] Larger documentation of mass shootings in the United States has occurred through independent and scholarly studies such as the Stanford University Mass Shootings in America Data Project.
Summary list since 2018 which includes all mass shooting events, deaths, injuries, and victims documented across Wikipedia.