The purpose of the study described was to evaluate the effectiveness of a cognitive behavioural intervention for anger management with children diagnosed with Asperger syndrome. Forty-five children and their parents were randomly assigned to either intervention or wait-list control conditions. Children in the intervention participated in six 2-h weekly sessions while parents participated in a larger parent group. Parent reports indicated a significant decrease in episodes of anger following intervention and a significant increase in their own confidence in managing anger in their child. Qualitative information gathered from parents and teachers indicated some generalization of strategies learned in the clinic setting to both home and school settings. Limitations of the study and suggestions for future research are also discussed.