Background:Epidemiology, the study of patterns of disease distribution in time and space, can help to improve mental health services for children and adolescents by increasing understanding of causes, development, and course of psychiatric disorders.Objectives:To describe the prevalence of DSM-IV TR psychiatric disorders and comorbidities in students of Paveh, one of the western cities in Iran.Materials and Methods:The participants of this cross sectional survey were 379 children and adolescents aged 6-18 years old that were selected by multistage cluster sampling method. They were screened in the first phase of the study by two screening tools. In the second phase, 141 students were assessed by K-SADS-PL psychiatric interview.Results:The overall prevalence of DSM-IV TR disorders in this population according to psychiatric interview was 24.4%. The most common disorder was attention deficit hyperactivity disorder (11.9%) and then generalized anxiety disorder (11.3%), social phobia (6.2%), and separation anxiety disorder (6.2%). There was no significant difference between two sex and age groups except enuresis.Conclusions:The prevalence of psychiatric disorders in Paveh is comparable to other areas of Iran and the world. The high prevalence of attention deficit hyperactivity disorder needs more consideration and treatment plans.