Objective: This research study assesses the effectiveness of participation in a multimodal/holistic residential treatment program on changing deviant sexual interests and functional impairment among sexually abusive youth. Method: A one-group pretest posttest design was utilized to examine pretest (intake) and posttest (discharge) scores for 58 youth between the ages of 9 and 18. Outcome measures included Child and Adolescent Functional Assessment Scale (CAFAS) and the Abel Assessment for Sexual Interest-Adolescent (AASI). Results: The results indicate significant improvement from pretest to posttest scores. Length of stay was not found to influence these impacts. Conclusions: The applications of these results to understanding the effectiveness of residential treatment for sexually abusive youth and the assessment of treatment outcomes for these youth are explored and discussed. (Contains 2 tables.)