Mental health disorders are common among Veterans and even more prevalent among justice‑involved Veterans, who show higher rates of PTSD, depression, substance use disorders, trauma histories, alcohol and opioid misuse, and suicidal behavior, indicating a particularly vulnerable subgroup. This session summarizes the mental health conditions most relevant to this population, emphasizing PTSD, depression, and SUDs, along with risk factors such as childhood trauma, combat exposure, repeated deployments, legal stressors, and limited post‑deployment support. Evidence‑based treatments for PTSD (Cognitive Processing Therapy, Prolonged Exposure, EMDR), empirically supported therapies for depression (CBT, IPT, MBCT, psychodynamic approaches), and effective pharmacologic and behavioral interventions for SUDs are reviewed, with integrated treatment highlighted as the most effective approach when PTSD and SUD co‑occur. Screening considerations, communication strategies, and clinical practices tailored to the justice‑involved Veteran population are included, equipping participants to recognize complex presentations, understand contributing factors, and apply research‑supported interventions across clinical and justice settings.