This book provides mental health clinicians and trainees with an overview of the new category of obsessive-compulsive and related disorders as they apply to youth. These disorders are highly impairing but can typically be overlooked in children and adolescents when they most often onset. This book draws attention to these disorders and provides an up-to-date review on the classification and development of these conditions in youth. Chapters explore the arguments for and against the new obsessive-compulsive related disorder DSM-5 category, provide reviews of transdiagnostic factors believed to underly these disorders, as well expert overviews of the clinical disorders that make up this category. An international team of contributors focuses on a range of topics such as: pediatric acute-onset neuropsychiatric syndrome, early-onset and tic-related OCD, common comorbid psychiatric conditions in youth, developmental neurobiology, and more. This book is an essential read for clinicians who specialize in OCD and related disorders and treat children. It is also applicable to clinicians, trainees, and students across mental health disciplines such as: psychology, psychiatry, social work, mental health, and counselling.