This is a list of mass murders and spree killings committed at the perpetrator's current or former workplace. A mass murder is typically defined as a single incident in which three or more people are killed, with no "cooling off" period, not including perpetrators. A mass murder typically occurs in a single location where one or more persons kill several others.
This list does not include murders perpetrated by serial killers, members of democidal governments, or major political figures.
In civilian settings