The authors established and analyzed the most common forms of contemporary deviant behavior of young people in Russian educational institutions. The article describes the characteristics of the main forms of deviant behavior of young people, reveals their relationship and interdependence, provides information about individual elements that are important for the investigation, as well as for criminological and forensic prevention of violent crimes. In the course of the research, the authors conducted an anonymous questionnaire survey of two target groups - teachers and students of schools in the Kaliningrad region. Based on the analysis of the results of the questionnaire, the authors revealed a consistent trend of increasing incidents of physical and psychological violence in the educational environment over the past ten years. It was concluded that the most common forms of deviant behavior in educational institutions are illegal acts of physical violence, as well as manifestations of bullying and cyberbullying. At the same time, forms of deviant behavior are in interrelations, because bullying against a particular minor in a number of situations constantly develops into physical violence. The authors also identified the relevance of targeted training for teachers on the prevention of manifestation of modern forms of deviant behavior of young people in educational institutions: on the problems of combating terrorism and extremism in the youth environment, bullying and cyberbullying. The analysis of the results of the questionnaire also made it possible to identify certain blocks of typical information that may have a forensic value and be used for the purposes of solving and investigating crimes committed by minors.