Dysregulation of emotions is a core feature of virtually all internalizing disorders. This chapter reviews the literature on relations between emotion dysregulation and internalizing disorders, with specific attention to the treatment of emotion dysregulation as a transdiagnostic focus. It describes several commonly used therapy approaches, considering how each targets emotion dysregulation. It also reviews the efficacy of programs with regard to reducing maladaptive emotion regulation strategies. Finally, it outlines how parent emotion dysregulation is targeted in emotion socialization parenting programs (the Tuning into Kids suite of programs). These programs provide parents with skills to manage their and their children’s emotions effectively. The chapter finishes with summarizing how treatments for emotion dysregulation may be strengthened.