In-Hospital Suicides in Children and Adolescents: First Analyses of the Werner Felber Institute Database on Child and Adolescent Psychiatric Wards Abstract: Suicide is a significant challenge and a clinical phenomenon among adolescents and young adults. Suicide risk for youth receiving inpatient psychiatric treatment is likely increased, given higher levels of psychosocial strain among inpatients than among youth in the general population. Objective: To report on the number, frequency, and characteristics of in-hospital suicide attempts and suicides among children and adolescents receiving inpatient psychiatric treatment. Methods: Our analyses are based on the Werner-Felber-Institute Database, which includes all cases from 2019 to 2024, inasmuch as data on age, gender, or year of suicidal behavior were available. Assessment of characteristics related to suicidal behavior included data on hazardousness, lethality, psychopathology, likelihood for discovery, method, and motive. Results: Eight cases of suicide and 85 suicide attempts were reported among youth, with a mean age of 15.63 and 15.84 years. Compared to in-hospital suicide behavior in adults, these numbers were substantially lower for suicide but substantially higher for suicide attempts. Most suicide attempts among children and adolescents took place within the hospital building, using intoxication. Conclusions: The results provide first insights into suicide behavior among youth receiving inpatient psychiatric treatment. The high number of suicide attempts points to a significant risk constellation even while in clinical care. To delineate targeted preventive interventions, we need greater accuracy in data collection.