This workbook is designed to be used by participants in an anger management group treatment for individuals with substance use or mental disorders. Practitioners report that the manual and workbook have also been used successfully for self-study, without the support of a clinician or a group. The workbook provides individuals participating in the 12-week anger management group treatment with a summary of core concepts, worksheets for completing between-session challenges, and space to take notes for each of the sessions. The concepts and skills presented in the anger management treatment are best learned by practice and review and by completing the between-session challenges in this workbook. Using this workbook as you participate in the 12-week anger management group treatment will help you develop the skills that are necessary to successfully manage anger.