The Osaka school massacre was a school stabbing and mass murder that occurred in Ikeda, Osaka Prefecture, Japan, on 8 June 2001. Mamoru Takuma, a 37-year-old ex-convict with a history of mentally disturbed and anti-social behavior, stabbed eight students to death and seriously wounded fifteen others in a knife attack that lasted several minutes. Takuma was sentenced to death in August 2003, and executed in September 2004.

Ikeda is a city in Osaka Prefecture, Japan. As of 31 March 2023, the city had an estimated population of 103,064 in 49723 households and a population density of 4700 persons per km². The total area of the city is 22.14 square kilometres (8.55 sq mi). It is a suburban city of Osaka City and a part of the Kyoto-Osaka-Kobe metropolitan area.