Chronic pain is very common among primary care Veterans and can seriously impact overall patient functioning and well-being. Currently, behavioral treatments for pain management are not often provided in primary care because they are designed to be delivered in specialty care settings, such as chronic pain clinics. To address this gap in care, the proposed study will test if Brief Cognitive Behavioral Therapy for Chronic Pain (Brief CBT-CP) is an effective treatment. Therefore, the first objective of the proposed study is to conduct a randomized controlled trial of Brief CBT-CP compared to primary care treatment as usual to assess treatment effectiveness by examining changes in pain-related physical activity interference, psychological distress, pain intensity, and other related outcomes. 178 eligible participants will be randomized into either Brief CBT-CP and primary care treatment as usual or primary care treatment as usual only. Eligible Veterans will include those with chronic musculoskeletal pain and pain-related functional impairment identified from primary care. Participants assigned to Brief CBT-CP will receive six sessions of treatment in 30-minute appointments. This intervention will include education and goal setting, activities and pacing, relaxation skills, cognitive coping, and relapse prevention. Assessments will include validated self-report measures that will take place at pre-treatment (baseline), mid-treatment, post-treatment, and at 6-month follow-up. The second objective of this study is examine the mechanisms by which Brief CBT-CP leads to improvement in patient outcomes. Statistical analysis will reveal if changes pain self-efficacy (i.e., perceived ability to manage pain or engage in usual activities despite being in pain) and catastrophizing (i.e., unhelpful, negative though patterns about pain and pain management) lead to improvements in patient functioning. The third objective of this study will be to explore perceptions of Brief CBT-CP among patients who experience significant improvement in outcomes compared to those who did not experience improvement. Participants will include up to 40 patients who were treated with Brief CBT-CP. Participants will be interviewed about key components of the treatment and their perception of effectiveness. Interview data will be compared to the results of statistical analysis to help understand the mechanisms by which Brief CBT-CP is effective or identify areas for improvement. Results of this study will provide information needed to determine if Brief CBT-CP should be widely disseminated across VA primary care clinics.