The following is a list of massacres that have occurred in Japan and its predecessor entities ranging back to the Tokugawa shogunate (Some historical numbers may be approximate).
Massacres have become a growing problem in contemporary Japan in recent years, with at least 110+ deaths during the 2010s.
Most notably, the 2019 Kyoto Animation arson attack claimed at least 36 lives and injured an additional 34.
[1] In December 2021, another arson attack occurred, this time at a building in Osaka, specifically at a psychiatric clinic located on the fourth floor.
The suspect, who died in hospital two weeks later, is believed to have been inspired by the 2019 attack in Kyoto.