Dialectical behavioral therapy for complex posttraumatic stress disorders (DBT-PTSD) is a modular treatment program that was developed at the Central Institute for Mental Health at the University of Heidelberg, Germany in 2005-2021. DBT-PTSD is designed to meet the needs of patients with complex PTSD related to sexual or physical trauma in childhood and adolescence. It is specifically designed for patients suffering from severe emotional dysregulation, persistent self-injury, chronic suicidal ideation, severe dissociative symptoms and a markedly negative self-concept with a high level of guilt, shame, self-loathing and interpersonal problems. To address these different core symptoms, DBT-PTSD combines evidence-based therapeutic strategies: principles, rules, and skills of DBT, trauma-specific cognitive and exposure-based techniques, imaginative interventions and procedures for behavioral change. The treatment program is designed to be carried out in an outpatient (45 weeks) or residential (12 weeks) setting. The results from two randomized controlled trials showed large effect sizes across very different symptom domains and a significant superiority of DBT-PTSD over Cognitive Processing Therapy (CPT). Based on these results, DBT-PTSD is currently a promising evidence-based treatment program for all features of a complex PTSD after sexual abuse in childhood and adolescence.