EN
This paper presents juvenile delinquency as a threat to public security. The author explains the concepts of public security and public order, and discusses threats to public security in specific categories, i.e. social threats, technical threats, natural threats. The paper also contains an explanation of the concept of juvenile, which is based on the Polish Act of 1982 on Proceedings in Juvenile Cases and Juvenile Delinquency. Having analysed the source literature, the author has listed the basic determinants of juvenile delinquency. Making use of the statistical data made available on the website of the Warsaw Police Office, the paper shows the scale and structure of juvenile delinquency in the Capital City of Warsaw. Furthermore, the data from the website of the Warsaw Police Office has enabled the author to describe examples of abnormal juvenile behaviour observed in Warsaw. The paper also contains practical examples of actions taken by police in connection with juvenile delinquency.