Externalizing behaviors are characterized by outward displays of aggression, impulsivity, and deceitfulness, and are often taken out on an individual’s environment or on another person in that environment. One of the proposed underlying risk factors for externalizing behavior is emotion dysregulation. This chapter summarizes several empirically supported treatments for emotion dysregulation among children, adolescents, and adults with externalizing behavior problems. Cognitive-behavioral, mindfulness-based, and dialectical behavioral therapy approaches are reviewed, with particular emphasis on the importance of matching the aforementioned empirically based treatments to the developmental level of the patient. Furthermore, this chapter summarizes notable work that has been done to identify children at risk for externalizing behavior problems earlier in development, and to then subsequently teach emotion regulatory strategies in a preventative manner. Clinical implications and future directions for research are also discussed.