LAY SUMMARY Community reintegration refers to the period during which a person transitions from military service to civilian life. In the United Kingdom, understanding of the mental health impacts of community reintegration is limited because of the lack of research in this area. This study explored the extent to which a range of different aspects of community reintegration difficulties predicted the likelihood of experiencing several mental health disorders among 626 Northern Ireland Veterans. Results demonstrated that reintegration difficulties significantly predicted clinically relevant levels of anxiety, depression, posttraumatic stress disorder, and problematic alcohol use (even when other known risk factors for mental ill health among Veteran populations were considered). Reintegration difficulties in relation to interpersonal relationships was the most detrimental aspect of reintegration in terms of mental ill health. Findings demonstrated that difficulties reintegrating into civilian life after military service are a significant risk factor for a range of mental health disorders, underscoring the importance of interventions aimed at supporting military personnel during this time.