List of massacres in Japan
The following is a list of massacres that have occurred in Japan:
| Date | Name | Location | Perpetrator | Deaths | Notes |
| 12–15 April 1638 | Mass beheadings at the final days of the Shimabara revolt | inside and around Hara Castle, Minamishimabara | Shogunate army | 37,000 | Rebels and sympathizers were beheaded by military forces. Afterwards, the Hara Castle was also burned to the ground. |
| Yoshiwara spree killing | Yoshiwara | Sano Jirōzaemon | 100+ | ||
| March 1st demonstrations | Korea under Japanese rule | Imperial Japanese Army | 7,509 | 15,849 Koreans wounded | |
| Gando massacre | Jiandao | Imperial Japanese Army | 5,000+ | ||
| Shinano River incident | Shinano River | Okura zaibatsu | 100+ | Documentation on death incomplete | |
| Kantō Massacre | Kantō region | police and vigilantes | 6,000+ | Multiple incidents | |
| Tsuyama massacre | Tsuyama | Mutsuo Toi | 30 | 3 injured | |
| Hanaoka incident | Ōdate | Imperial Japanese Army | 418 | 113 prisoners of war executed; 307 also died | |
| Teigin case | Tokyo | Sadamichi Hirasawa | 12 | False verdict suspected | |
| Mitaka incident | Tokyo | Keisuke Takeuchi | 8 | 20 injured. False verdict suspected | |
| Mitsubishi bombing | Tokyo | East Asia Anti-Japan Armed Front | 8 | 376 injured | |
| Sakamoto family murder | Yokohama | Aum Shinrikyo | 3 | ||
| 27–28 June 1994 | Matsumoto incident | Matsumoto | Aum Shinrikyo | 8 | 500+ injured |
| Tokyo subway sarin attack | Tokyo | Aum Shinrikyo | 13 | 6,252 injured | |
| Wakayama arsenic poison case | Sonobe district of Wakayama, Wakayama | Masumi Hayashi | 4 | 64 injured | |
| Shimonoseki Station massacre | Shimonoseki | Yasuaki Uwabe | 5 | 10 injured | |
| Setagaya family murder | Setagaya | Unknown | 4 | Perpetrator never caught | |
| Osaka school massacre | Ikeda | Mamoru Takuma | 8 | 15 injured | |
| Myojo 56 building fire | Shinjuku | Unknown | 44 | Perpetrator never caught | |
| Akihabara massacre | Chiyoda | Tomohiro Katō | 7 | 10 injured | |
| Osaka Movie Theater fire | Osaka | Kazuhiro Ogawa | 16 | Perpetrator's name never revealed to the public. | |
| Sagamihara stabbings | Sagamihara | Satoshi Uematsu | 19 | 26 injured | |
| Hitachi City apartment arson | Ibaraki | Hirobumi Komatsu | 6 | ||
| Kawasaki stabbings | Kawasaki | Ryuichi Iwasaki | 3 | 16 injured | |
| Kyoto Animation arson attack | Kyoto | Shinji Aoba | 36 | 33 injured |