Taking into account the existing postgraduate training and advanced training programs for pediatric psychiatrists, the manual contains all the main sections of clinical psychiatry of children and adolescents. It highlights from a modern perspective the age-related features of the etiology, pathogenesis and clinic of childhood mental diseases, describes psychopathological syndromes that occur mainly in children and adolescents, and outlines the clinic, diagnosis, treatment and prevention of certain forms of mental illness observed in childhood and adolescence.