The prevalence of trauma and posttraumatic stress disorder (PTSD) is higher among individuals in prison and jail than in the general population. Research has shown a connection between trauma and criminality due in part to the coping mechanisms of aggression and substance misuse after a traumatic event. While the corrections environment itself may cause or exacerbate PTSD symptoms in some individuals, facilities can implement trauma-informed practices to minimize re-traumatization and reduce PTSD symptoms. This article documents the prevalence of trauma and PTSD within this population, and discusses how correctional facilities can implement trauma-informed practices and evidence-based approaches to assist individuals with trauma histories.