Deliberately set school fires cause significant economic, material, and social damage to society. This article aims to contribute to a sociological understanding and explanation of school fires set by juveniles and to the development of effective prevention strategies based on the results obtained. The study draws upon comprehensive empirical data from qualitative and quantitative research consisting of a questionnaire survey, substantive interviews, and document analysis. The findings show firesetting to be a complex, multifaceted phenomenon, which calls for a diversified approach to prevention relying on structural, situational, and social interventions. While juveniles setting schools on fire appear in many respects to be similar to other youths engaged in delinquent behaviours in society, the fires they set can be internally categorized according to firesetting motive, offender characteristics, and modus operandi. The implications of the resulting typology of six main types of school fires for prevention work are discussed, with practical suggestions for effective countermeasures offered.