This Therapist Guide is designed to assist clinicians in delivering Cognitive Behavior Therapy (CBT) in a group setting to clients with PTSD. The book integrates best practices derived from group therapy literature, with evidence-based cognitive behavioral approaches targeting PTSD and frequently co-occurring conditions such as depression, anxiety, and social isolation. Group CBT has been tested and shown to reduce symptoms of PTSD and improve quality of life, overall functioning, and life satisfaction. The Therapist Guide provides session by session guidance and includes notes for the delivery of Group CBT based on the author's years of clinical experience working with individuals with PTSD. The accompanying Client Workbook contains helpful information sheets, worksheets, and forms, designed to track progress and facilitate mastery of specific CBT techniques.