Over the past two decades, adjunctive psychosocial treatments for bipolar disorder have been shown to hasten recovery, reduce relapse, and improve patients’ medication adherence, functioning, and quality of life. This chapter reviews four of the most widely studied psychosocial approaches for bipolar disorder: psychoeducation, cognitive-behavioral therapy (CBT), family-focused treatment (FFT), and interpersonal and social rhythm therapy (IPSRT). Core treatment strategies for each modality are presented, and key outcome studies are reviewed. The role of psychosocial treatment in pediatric bipolar disorder and in the prevention of bipolar disorder in youth at high risk for bipolar disorder is also presented. Suggestions for future research and the critical need for dissemination are also briefly discussed.