Trauma contributes to the development and persistence of conduct problems. A study of 29 boys with conduct problems in residential or day treatment was conducted. The boys were randomized into standard care or standard care plus three trauma-focused EMDR sessions. The method of EMDR involves having the client concentrate intensely on the most upsetting part of the traumatic memory while moving his/her eyes from side to side. Following a set of eye movements, the client is asked to report whatever comes to awareness; this commonly includes changes in imagery, thought, emotion, or physical sensation related to the trauma. This report becomes the focus of the next set of eye movements. This procedure is repeated until the client can identify no further distressing elements of the memory and can embrace a more positive or adaptive perspective regarding the memory. Results show that EMDR worked for the boys with conduct problems in reducing reactivity to treated traumatic memories; and treating traumatic memories with EMDR led to reduced conduct problem symptoms. The findings provide support for the theory that post-traumatic symptoms contribute to the development and persistence of conduct problems, and that effective trauma treatment can pave the way for meaningful symptom reduction. The study replicated and extended previous findings supporting EMDR’s effectiveness in resolving the distress and reactivity associated with traumatic memories in child and adolescent populations. Despite the apparent effectiveness of this treatment, the lasting value in lieu of a comprehensive treatment approach is doubted. However, these findings are sufficiently promising to warrant a larger replication. 1 figure, 2 tables, 52 references