Dissertation thesis Psychosocial characteristics of juvenile offenders committing serious crimes deals with the juvenile offenders sentenced for a murder commission in the Czech Republic. The thesis is divided into two parts that are a casuistic part and empiric one. Both parts are based on a large research carried out by means of the sample of 19 juveniles within Czech prisons specialized at this age category. Furthermore the casuistic theoretical part is focused on particular socialization and personal characteristics related to juvenile crime. The empiric part lies in research findings on juvenile murderers including female perpetrators resulting from a set of psychological methods and interviews with the convicted persons. Key words Crime Murder - murderer Juvenile Family Education School Peer Leisure time Addictive substances Personality Self-reflection Life satisfaction Mental capability Aggression Psychopathology