The present study examined associations between childhood attention-deficit-hyperactivity disorder (ADHD) symptoms and adulthood dissociation in 799 male inmates using self-reporting questionnaires. Consequently, 33% of the subjects reported childhood physical abuse, and 11.8% reported childhood sexual abuse. A significant association was found between childhood ADHD symptoms and current dissociative tendency (r = 0.51, P < 0.001). Clinical implications of intervention focusing on dissociation in correctional/forensic practices for adult offenders are discussed.