The aim of the study is to identify the effectiveness of juvenile crime prevention programmes. After the introduction of the juvenile crime prevention programme into the educational process, aggressiveness (p≤0.01) and conflict (p≤0.01), propensity to break norms (p≤0.001), addictive behaviour (p≤0.01), selfdestructive behaviour (p≤0.01), to aggression (p≤0.05), delinquent behaviour (p≤0.001) decreased among juveniles, while volitional control increased (p≤0.05). Much fewer juveniles are the initiators of bullying (p≤0.001) and their assistants (p≤0.01). The study showed that a certain part of the surveyed juveniles are prone to criminal behaviour; however, it was proved that special programmes are effective in preventing it. A decrease in delinquent behaviour, manifestations of bullying, aggressiveness, and proneness to conflict was found after the participation of the juveniles in the programme. The obtained results are useful for the implementation in educational institutions to prevent juvenile offences.